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char = e;code = 101
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char = o;code = 111
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char = t;code = 116
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char = n;code = 110
char = d;code = 100
char = ;code = 32
char = a;code = 97
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char = p;code = 112
char = l;code = 108
char = i;code = 105
char = c;code = 99
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 = n;code = 110
char = ;code = 32
char = S;code = 83
char = P;code = 80
char = M;code = 77
char = E;code = 69
char = /;code = 47
char = G;code = 71
char = C;code = 67
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 = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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 = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = h;code = 104
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = r;code = 114
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 = a;code = 97
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = x;code = 120
char = [;code = 91
char = 6;code = 54
char = ];code = 93
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = b;code = 98
char = e;code = 101
char = r;code = 114
char = .;code = 46
result sql = Development and application of an SPME/GC method for the determination of trace phthalates in beer using a calix[6]arene fiber.
Development and application of an SPME/GC method for the determination of trace phthalates in beer using a calix[6]arene fiber.
char = A;code = 65
char = ;code = 32
char = s;code = 115
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char = m;code = 109
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char = l;code = 108
char = e;code = 101
char = ,;code = 44
char = ;code = 32
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char = o;code = 111
char = w;code = 119
char = -;code = 45
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
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 = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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 = 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 = h;code = 104
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = a;code = 97
char = c;code = 99
char = i;code = 105
char = d;code = 100
char = ;code = 32
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char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = P;code = 80
char = A;code = 65
char = E;code = 69
char = s;code = 115
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = o;code = 111
char = p;code = 112
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = a;code = 97
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = d;code = 100
char = -;code = 45
char = p;code = 112
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = e;code = 101
char = x;code = 120
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = P;code = 80
char = M;code = 77
char = E;code = 69
char = );code = 41
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = l;code = 108
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = g;code = 103
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 = y;code = 121
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 = a;code = 97
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = -;code = 45
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = x;code = 120
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = -;code = 45
char = c;code = 99
char = o;code = 111
char = n;code = 110
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 = 32
char = f;code = 102
char = i;code = 105
char = b;code = 98
char = e;code = 101
char = r;code = 114
char = .;code = 46
char = ;code = 32
char = G;code = 71
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = x;code = 120
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = e;code = 101
char = r;code = 114
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 = i;code = 105
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
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char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = f;code = 102
char = y;code = 121
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = e;code = 101
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
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char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
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char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = r;code = 114
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 = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = p;code = 112
char = r;code = 114
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char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
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char = t;code = 116
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char = e;code = 101
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char = i;code = 105
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char = f;code = 102
char = l;code = 108
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char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
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char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = a;code = 97
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char = r;code = 114
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char = ;code = 32
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char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = e;code = 101
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char = l;code = 108
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char = e;code = 101
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char = .;code = 46
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char = e;code = 101
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char = i;code = 105
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char = t;code = 116
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char = t;code = 116
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char = e;code = 101
char = ;code = 32
char = S;code = 83
char = P;code = 80
char = M;code = 77
char = E;code = 69
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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char = p;code = 112
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char = r;code = 114
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char = o;code = 111
char = r;code = 114
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char = d;code = 100
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char = i;code = 105
char = n;code = 110
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char = r;code = 114
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = r;code = 114
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char = m;code = 109
char = a;code = 97
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = F;code = 70
char = i;code = 105
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char = e;code = 101
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char = e;code = 101
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char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = l;code = 108
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char = p;code = 112
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
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char = i;code = 105
char = n;code = 110
char = c;code = 99
char = l;code = 108
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = n;code = 110
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char = e;code = 101
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char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = t;code = 116
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char = m;code = 109
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = a;code = 97
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char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = t;code = 116
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char = m;code = 109
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char = ,;code = 44
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char = s;code = 115
char = t;code = 116
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char = r;code = 114
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
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char = s;code = 115
char = p;code = 112
char = e;code = 101
char = e;code = 101
char = d;code = 100
char = ,;code = 44
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char = s;code = 115
char = a;code = 97
char = l;code = 108
char = t;code = 116
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char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = o;code = 111
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
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char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = u;code = 117
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
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 = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = T;code = 84
char = a;code = 97
char = g;code = 103
char = u;code = 117
char = c;code = 99
char = h;code = 104
char = i;code = 105
char = ';code = 39
char = s;code = 115
char = ;code = 32
char = L;code = 76
char = 2;code = 50
char = 5;code = 53
char = ;code = 32
char = (;code = 40
char = 5;code = 53
char = (;code = 40
char = 6;code = 54
char = );code = 41
char = );code = 41
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = g;code = 103
char = o;code = 111
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = r;code = 114
char = a;code = 97
char = y;code = 121
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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 = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
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char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = L;code = 76
char = O;code = 79
char = D;code = 68
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 0;code = 48
char = 3;code = 51
char = -;code = 45
char = 3;code = 51
char = .;code = 46
char = 4;code = 52
char = 2;code = 50
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char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = g;code = 103
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char = L;code = 76
char = (;code = 40
char = -;code = 45
char = 1;code = 49
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char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
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 = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = s;code = 115
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char = a;code = 97
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char = d;code = 100
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = d;code = 100
char = e;code = 101
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char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
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char = v;code = 118
char = a;code = 97
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char = u;code = 117
char = e;code = 101
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char = r;code = 114
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char = r;code = 114
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char = 5;code = 53
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char = r;code = 114
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char = a;code = 97
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char = l;code = 108
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char = ;code = 32
char = t;code = 116
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char = e;code = 101
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char = e;code = 101
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
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char = P;code = 80
char = A;code = 65
char = E;code = 69
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = m;code = 109
char = e;code = 101
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char = h;code = 104
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char = a;code = 97
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char = a;code = 97
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char = d;code = 100
char = a;code = 97
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char = e;code = 101
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char = u;code = 117
char = s;code = 115
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char = n;code = 110
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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 = a;code = 97
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char = d;code = 100
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char = a;code = 97
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char = d;code = 100
char = i;code = 105
char = t;code = 116
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char = o;code = 111
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char = m;code = 109
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char = t;code = 116
char = h;code = 104
char = o;code = 111
char = d;code = 100
char = o;code = 111
char = l;code = 108
char = o;code = 111
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char = y;code = 121
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = r;code = 114
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char = c;code = 99
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char = v;code = 118
char = e;code = 101
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char = y;code = 121
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char = a;code = 97
char = l;code = 108
char = u;code = 117
char = e;code = 101
char = s;code = 115
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char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
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char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
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char = 8;code = 56
char = 6;code = 54
char = .;code = 46
char = 3;code = 51
char = %;code = 37
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = 1;code = 49
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char = 9;code = 57
char = .;code = 46
char = 3;code = 51
char = %;code = 37
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
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char = r;code = 114
char = v;code = 118
char = e;code = 101
char = y;code = 121
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
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char = e;code = 101
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char = o;code = 111
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char = t;code = 116
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char = e;code = 101
char = d;code = 100
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char = b;code = 98
char = e;code = 101
char = e;code = 101
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char = a;code = 97
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char = p;code = 112
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char = e;code = 101
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char = a;code = 97
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char = i;code = 105
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char = u;code = 117
char = t;code = 116
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char = t;code = 116
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char = e;code = 101
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char = i;code = 105
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char = a;code = 97
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char = t;code = 116
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char = E;code = 69
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char = E;code = 69
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char = o;code = 111
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char = e;code = 101
char = e;code = 101
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char = ;code = 32
char = T;code = 84
char = h;code = 104
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char = E;code = 69
char = H;code = 72
char = P;code = 80
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char = w;code = 119
char = a;code = 97
char = s;code = 115
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char = a;code = 97
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char = c;code = 99
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char = L;code = 76
char = (;code = 40
char = -;code = 45
char = 1;code = 49
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char = .;code = 46
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char = o;code = 111
char = r;code = 114
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char = e;code = 101
char = r;code = 114
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char = e;code = 101
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char = ;code = 32
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char = a;code = 97
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char = i;code = 105
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char = c;code = 99
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char = a;code = 97
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char = a;code = 97
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char = e;code = 101
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char = e;code = 101
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char = p;code = 112
char = l;code = 108
char = a;code = 97
char = s;code = 115
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char = i;code = 105
char = c;code = 99
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char = z;code = 122
char = e;code = 101
char = d;code = 100
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char = y;code = 121
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char = i;code = 105
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char = o;code = 111
char = r;code = 114
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = ;code = 32
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result sql = A simple, low-cost and sensitive method for the determination of phthalate acid esters (PAEs) in beer has been developed based on solid-phase microextraction (SPME) followed by gas chromatography using a novel sol-gel calixarene-contained fiber. Generally speaking, matrix interference is one of the most important problems that researchers have to face when quantifying trace compounds in the complicated beer samples. In order to reproduce the influence of the matrix, synthetic beer solutions were popularly used, while they could not represent the real beer matrix absolutely. Owing to the good selectivity and high sensitivity of this new calixarene fiber, matrix interference from the beer samples was effectively avoided and low limits of detection (LODs) could be achieved. As a result, the SPME was performed in real beer matrices. Five experimental parameters including extraction temperature, extraction time, stirring speed, salt concentration and ultrasonic time were evaluated and optimized by means of a Taguchi's L25 (5(6)) orthogonal array experimental design. Under the optimized conditions, LODs of 0.003-3.429 microg L(-1) were obtained and the relative standard deviation values were < or =13.51% for all of the eight PAEs. The method was validated using standard addition methodology and recovery values were between 86.3% and 109.3%. The survey of three bottled beer samples showed that dibutyl-phthalate ester and bis(2-ethylhexyl)-phthalate ester (DEHP) were the main PAEs found in beer. The concentration of DEHP was as high as 5.24 microg L(-1). In order to investigate the source of phthalates contamination in beer, the composition of phthalates in the plasticized polyvinyl chloride (PVC) gaskets of the lids was analyzed. Results revealed that the high content of DEHP incorporated in PVC gaskets could be a potential source of PAEs in bottled beers during transportation and storage.

Publication: Anal. Chim. Acta 2009 May 8 ;641(1-2)::64-74. :doi: 10.1016/j.aca.2009.02.052.
Publication Date: 2009 May 8
Study Author(s): Ye, Chang-Wen;Gao, Jie;Yang, Cai;Liu, Xiao-Jing;Li, Xiu-Juan;Pan, Si-Yi;
Institution: College of Food Science & Technology, Huazhong Agricultural University, Wuhan 430070, China.
Shortcut link to this study:
A simple, low-cost and sensitive method for the determination of phthalate acid esters (PAEs) in beer has been developed based on solid-phase microextraction (SPME) followed by gas chromatography using a novel sol-gel calixarene-contained fiber. Generally speaking, matrix interference is one of the most important problems that researchers have to face when quantifying trace compounds in the complicated beer samples. In order to reproduce the influence of the matrix, synthetic beer solutions were popularly used, while they could not represent the real beer matrix absolutely. Owing to the good selectivity and high sensitivity of this new calixarene fiber, matrix interference from the beer samples was effectively avoided and low limits of detection (LODs) could be achieved. As a result, the SPME was performed in real beer matrices. Five experimental parameters including extraction temperature, extraction time, stirring speed, salt concentration and ultrasonic time were evaluated and optimized by means of a Taguchi's L25 (5(6)) orthogonal array experimental design. Under the optimized conditions, LODs of 0.003-3.429 microg L(-1) were obtained and the relative standard deviation values were < or =13.51% for all of the eight PAEs. The method was validated using standard addition methodology and recovery values were between 86.3% and 109.3%. The survey of three bottled beer samples showed that dibutyl-phthalate ester and bis(2-ethylhexyl)-phthalate ester (DEHP) were the main PAEs found in beer. The concentration of DEHP was as high as 5.24 microg L(-1). In order to investigate the source of phthalates contamination in beer, the composition of phthalates in the plasticized polyvinyl chloride (PVC) gaskets of the lids was analyzed. Results revealed that the high content of DEHP incorporated in PVC gaskets could be a potential source of PAEs in bottled beers during transportation and storage.
PMID: 19393368

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