|
|
char = G;code = 71
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = -;code = 45
char = m;code = 109
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = o;code = 111
char = r;code = 114
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = .;code = 46
result sql = Gas chromatographic-mass spectrometric characterisation of plant gums in samples from painted works of art.
Gas chromatographic-mass spectrometric characterisation of plant gums in samples from painted works of art.char = T;code = 84
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = G;code = 71
char = C;code = 67
char = -;code = 45
char = M;code = 77
char = S;code = 83
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = d;code = 100
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = p;code = 112
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = l;code = 108
char = y;code = 121
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = d;code = 100
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = i;code = 105
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = v;code = 118
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = w;code = 119
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = ,;code = 44
char = ;code = 32
char = k;code = 107
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = y;code = 121
char = a;code = 97
char = ,;code = 44
char = ;code = 32
char = g;code = 103
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = i;code = 105
char = ,;code = 44
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = a;code = 97
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = g;code = 103
char = a;code = 97
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = h;code = 104
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = r;code = 114
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = o;code = 111
char = u;code = 117
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = p;code = 112
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = O;code = 79
char = p;code = 112
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = o;code = 111
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = P;code = 80
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = D;code = 68
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = F;code = 70
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = I;code = 73
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = );code = 41
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result sql = This paper presents an analytical GC-MS procedure to study the chemical composition of plant gums, determining aldoses and uronic acids in one step. The procedure is based on the silylation of aldoses and uronic acids, released from plant gums by microwave assisted hydrolysis, and previously converted into the corresponding diethyl-dithioacetals and diethyl-dithioacetal lactones. Using this method only one peak for each compound is obtained, thus providing simple and highly reproducible chromatograms. The analytical procedure was optimised using reference samples of raw plant gums (arabic, karaya, ghatti, guar, locust bean and tragacanth, cherry, plum and peach gums), commercial watercolours and paint layers prepared according to ancient recipes at the Opificio delle Pietre Dure of Florence (Italy). To identify gum media in samples of unknown composition, a decisional schema for the gum identification and the principal component analysis of the relative sugar percentage contents were employed. The procedure was used to study samples collected from wall paintings from Macedonian tombs (4th-3rd centuries bc) and from the Mycenaean "Palace of Nestor" (13th century bc) in Pylos, Greece. The presence of carbohydrates was ascertained and plant gum binders (fruit and a mixture of tragacanth and fruit tree gums) were identified in some of the samples.
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result sql = Gas chromatographic-mass spectrometric characterisation of plant gums in samples from painted works of art.
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char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
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char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
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char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
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char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = w;code = 119
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = d;code = 100
char = r;code = 114
char = o;code = 111
char = l;code = 108
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = i;code = 105
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = o;code = 111
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char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
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char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = a;code = 97
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char = e;code = 101
char = t;code = 116
char = a;code = 97
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char = s;code = 115
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
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char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = o;code = 111
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = v;code = 118
char = i;code = 105
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
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char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = w;code = 119
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = g;code = 103
char = u;code = 117
char = m;code = 109
char = s;code = 115
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char = (;code = 40
char = a;code = 97
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char = a;code = 97
char = b;code = 98
char = i;code = 105
char = c;code = 99
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char = ;code = 32
char = k;code = 107
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = y;code = 121
char = a;code = 97
char = ,;code = 44
char = ;code = 32
char = g;code = 103
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = i;code = 105
char = ,;code = 44
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char = g;code = 103
char = u;code = 117
char = a;code = 97
char = r;code = 114
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char = ;code = 32
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char = c;code = 99
char = u;code = 117
char = s;code = 115
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char = e;code = 101
char = a;code = 97
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char = a;code = 97
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char = g;code = 103
char = a;code = 97
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char = a;code = 97
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char = h;code = 104
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char = ;code = 32
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char = u;code = 117
char = m;code = 109
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char = a;code = 97
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char = ;code = 32
char = g;code = 103
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char = m;code = 109
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char = ,;code = 44
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char = m;code = 109
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char = c;code = 99
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char = a;code = 97
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char = w;code = 119
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char = t;code = 116
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char = c;code = 99
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char = l;code = 108
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char = r;code = 114
char = s;code = 115
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char = l;code = 108
char = a;code = 97
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char = r;code = 114
char = s;code = 115
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char = p;code = 112
char = r;code = 114
char = e;code = 101
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char = a;code = 97
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char = d;code = 100
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char = a;code = 97
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char = c;code = 99
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char = t;code = 116
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char = c;code = 99
char = i;code = 105
char = p;code = 112
char = e;code = 101
char = s;code = 115
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char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = O;code = 79
char = p;code = 112
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = o;code = 111
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char = l;code = 108
char = e;code = 101
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char = P;code = 80
char = i;code = 105
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = D;code = 68
char = u;code = 117
char = r;code = 114
char = e;code = 101
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = F;code = 70
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char = o;code = 111
char = r;code = 114
char = e;code = 101
char = n;code = 110
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char = e;code = 101
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char = (;code = 40
char = I;code = 73
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = y;code = 121
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char = .;code = 46
char = ;code = 32
char = T;code = 84
char = o;code = 111
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char = i;code = 105
char = d;code = 100
char = e;code = 101
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char = t;code = 116
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char = u;code = 117
char = m;code = 109
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char = e;code = 101
char = d;code = 100
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char = s;code = 115
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char = m;code = 109
char = p;code = 112
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char = e;code = 101
char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = u;code = 117
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char = k;code = 107
char = n;code = 110
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char = n;code = 110
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char = c;code = 99
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char = p;code = 112
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char = e;code = 101
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char = o;code = 111
char = r;code = 114
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char = e;code = 101
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char = a;code = 97
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char = a;code = 97
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char = s;code = 115
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char = w;code = 119
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char = e;code = 101
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char = e;code = 101
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = o;code = 111
char = y;code = 121
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char = d;code = 100
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = p;code = 112
char = r;code = 114
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char = c;code = 99
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char = u;code = 117
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char = a;code = 97
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char = u;code = 117
char = s;code = 115
char = e;code = 101
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char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
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char = e;code = 101
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char = c;code = 99
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char = e;code = 101
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char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
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char = w;code = 119
char = a;code = 97
char = l;code = 108
char = l;code = 108
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char = p;code = 112
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
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char = M;code = 77
char = a;code = 97
char = c;code = 99
char = e;code = 101
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char = o;code = 111
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char = a;code = 97
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char = t;code = 116
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = s;code = 115
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char = (;code = 40
char = 4;code = 52
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char = 3;code = 51
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char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = s;code = 115
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char = b;code = 98
char = c;code = 99
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char = a;code = 97
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char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = M;code = 77
char = y;code = 121
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = a;code = 97
char = e;code = 101
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result sql = This paper presents an analytical GC-MS procedure to study the chemical composition of plant gums, determining aldoses and uronic acids in one step. The procedure is based on the silylation of aldoses and uronic acids, released from plant gums by microwave assisted hydrolysis, and previously converted into the corresponding diethyl-dithioacetals and diethyl-dithioacetal lactones. Using this method only one peak for each compound is obtained, thus providing simple and highly reproducible chromatograms. The analytical procedure was optimised using reference samples of raw plant gums (arabic, karaya, ghatti, guar, locust bean and tragacanth, cherry, plum and peach gums), commercial watercolours and paint layers prepared according to ancient recipes at the Opificio delle Pietre Dure of Florence (Italy). To identify gum media in samples of unknown composition, a decisional schema for the gum identification and the principal component analysis of the relative sugar percentage contents were employed. The procedure was used to study samples collected from wall paintings from Macedonian tombs (4th-3rd centuries bc) and from the Mycenaean "Palace of Nestor" (13th century bc) in Pylos, Greece. The presence of carbohydrates was ascertained and plant gum binders (fruit and a mixture of tragacanth and fruit tree gums) were identified in some of the samples.
Publication: J Chromatogr A 2007 Dec 21 ;1175(2)::275-82.
Publication Date: 2007 Dec 21
Study Author(s): Bonaduce, Ilaria;Brecoulaki, Hariclia;Colombini, Maria Perla;Lluveras, Anna;Restivo, Vincenzo;Ribechini, Erika;
Institution: Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy. [email protected]
Shortcut link to this study:
Publication Date: 2007 Dec 21
Study Author(s): Bonaduce, Ilaria;Brecoulaki, Hariclia;Colombini, Maria Perla;Lluveras, Anna;Restivo, Vincenzo;Ribechini, Erika;
Institution: Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126 Pisa, Italy. [email protected]
Shortcut link to this study:
This paper presents an analytical GC-MS procedure to study the chemical composition of plant gums, determining aldoses and uronic acids in one step. The procedure is based on the silylation of aldoses and uronic acids, released from plant gums by microwave assisted hydrolysis, and previously converted into the corresponding diethyl-dithioacetals and diethyl-dithioacetal lactones. Using this method only one peak for each compound is obtained, thus providing simple and highly reproducible chromatograms. The analytical procedure was optimised using reference samples of raw plant gums (arabic, karaya, ghatti, guar, locust bean and tragacanth, cherry, plum and peach gums), commercial watercolours and paint layers prepared according to ancient recipes at the Opificio delle Pietre Dure of Florence (Italy). To identify gum media in samples of unknown composition, a decisional schema for the gum identification and the principal component analysis of the relative sugar percentage contents were employed. The procedure was used to study samples collected from wall paintings from Macedonian tombs (4th-3rd centuries bc) and from the Mycenaean "Palace of Nestor" (13th century bc) in Pylos, Greece. The presence of carbohydrates was ascertained and plant gum binders (fruit and a mixture of tragacanth and fruit tree gums) were identified in some of the samples.
PMID: 18023451
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