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result sql = Construction and characterization of the direct piezoelectric immunosensor for atrazine operating in solution.
Construction and characterization of the direct piezoelectric immunosensor for atrazine operating in solution.
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char = x;code = 120
char = );code = 41
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 = a;code = 97
char = s;code = 115
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = c;code = 99
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char = f;code = 102
char = l;code = 108
char = u;code = 117
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = o;code = 111
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char = t;code = 116
char = a;code = 97
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char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
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char = A;code = 65
char = b;code = 98
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char = ;code = 32
char = M;code = 77
char = A;code = 65
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char = s;code = 115
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char = i;code = 105
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char = c;code = 99
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char = b;code = 98
char = a;code = 97
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char = ;code = 32
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char = ;code = 32
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char = a;code = 97
char = z;code = 122
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char = (;code = 40
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char = n;code = 110
char = c;code = 99
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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 = s;code = 115
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char = 0;code = 48
char = -;code = 45
char = 1;code = 49
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
char = r;code = 114
char = a;code = 97
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char = );code = 41
char = ;code = 32
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char = r;code = 114
char = ;code = 32
char = 1;code = 49
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char = ;code = 32
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char = n;code = 110
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char = a;code = 97
char = n;code = 110
char = d;code = 100
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char = e;code = 101
char = ;code = 32
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char = x;code = 120
char = t;code = 116
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char = r;code = 114
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char = ;code = 32
char = w;code = 119
char = a;code = 97
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char = ;code = 32
char = t;code = 116
char = h;code = 104
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char = n;code = 110
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char = i;code = 105
char = n;code = 110
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char = o;code = 111
char = d;code = 100
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char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
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 = f;code = 102
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = l;code = 108
char = l;code = 108
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
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char = g;code = 103
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = i;code = 105
char = t;code = 116
char = h;code = 104
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 = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
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 = 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
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char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = f;code = 102
char = t;code = 116
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 = f;code = 102
char = i;code = 105
char = x;code = 120
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = o;code = 111
char = d;code = 100
char = ;code = 32
char = (;code = 40
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = );code = 41
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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 = 46
char = ;code = 32
char = A;code = 65
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = e;code = 101
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char = e;code = 101
char = d;code = 100
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char = e;code = 101
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char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = l;code = 108
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = M;code = 77
char = A;code = 65
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char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
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char = d;code = 100
char = e;code = 101
char = d;code = 100
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char = i;code = 105
char = m;code = 109
char = p;code = 112
char = r;code = 114
char = o;code = 111
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char = e;code = 101
char = d;code = 100
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char = e;code = 101
char = n;code = 110
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char = i;code = 105
char = v;code = 118
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char = ;code = 32
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char = ;code = 32
char = a;code = 97
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char = e;code = 101
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char = F;code = 70
char = o;code = 111
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char = ;code = 32
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char = e;code = 101
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char = d;code = 100
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char = t;code = 116
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char = u;code = 117
char = i;code = 105
char = d;code = 100
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char = .;code = 46
char = 1;code = 49
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char = ;code = 32
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char = m;code = 109
char = i;code = 105
char = c;code = 99
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char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = /;code = 47
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
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char = u;code = 117
char = s;code = 115
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char = d;code = 100
char = ;code = 32
char = 5;code = 53
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 3;code = 51
char = 0;code = 48
char = %;code = 37
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
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 = 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
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char = b;code = 98
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = M;code = 77
char = A;code = 65
char = b;code = 98
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = R;code = 82
char = e;code = 101
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
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 = c;code = 99
char = r;code = 114
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = i;code = 105
char = e;code = 101
char = v;code = 118
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 = a;code = 97
char = ;code = 32
char = 5;code = 53
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = 0;code = 48
char = ;code = 32
char = m;code = 109
char = M;code = 77
char = ;code = 32
char = N;code = 78
char = a;code = 97
char = O;code = 79
char = H;code = 72
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
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 = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
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 = 32
char = s;code = 115
char = e;code = 101
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
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 = a;code = 97
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = z;code = 122
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
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 = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = i;code = 105
char = e;code = 101
char = z;code = 122
char = o;code = 111
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = s;code = 115
char = o;code = 111
char = r;code = 114
char = s;code = 115
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = The direct immunosensor for determination of the herbicide atrazine was studied. The gold electrodes of the piezoelectric quartz crystal were silanized and activated using glutaraldehyde. The bioaffinity ligand atrazine was linked through albumin as a spacer molecule. The modified piezoelectric crystal was placed in a flow cell and all measurements were performed directly in flowing solution. The interaction of the anti atrazine monoclonal antibody (MAb, clone D6F3) with the immobilized atrazine was characterized using both crude ascitic fluid and Protein A-purified MAb preparates. The association and dissociation rate constants were determined, ka = 1.21 x 10(5) M-1S-1 and kd = 4.0 x 10(-4)S-1. The competitive determination of free atrazine was studied using different dilutions (100x, 250x and 1000x) of the ascitic fluid containing MAb. MAb was preincubated with atrazine (concentrations 0-1 microgram/l) for 15 min and the mixture was then introduced to the flow cell. As a signal, either the rate of frequency decrease or the relative change of frequency after the fixed binding period (10 min) was evaluated. As expected, the higher dilutions of MAb provided improved sensitivity for the analyte. For the 1000x diluted ascitic fluid, 0.1 and 1 microgram/l atrazine caused 5 and 30% decreases of the relative binding of MAb, respectively. Repeated use of the crystals was achieved using a 5 min flow of 100 mM NaOH for regeneration. The results obtained seem to be promising for determination of atrazine in drinking water using direct piezoelectric immunosensors.

Publication: Biosens Bioelectron 1997 ;12(1)::19-27.
Publication Date: 1997
Study Author(s): Steegborn, C;Skládal, P;
Institution: Department of Biochemistry, Masaryk University, Brno, Czech Republic.
Shortcut link to this study:
The direct immunosensor for determination of the herbicide atrazine was studied. The gold electrodes of the piezoelectric quartz crystal were silanized and activated using glutaraldehyde. The bioaffinity ligand atrazine was linked through albumin as a spacer molecule. The modified piezoelectric crystal was placed in a flow cell and all measurements were performed directly in flowing solution. The interaction of the anti atrazine monoclonal antibody (MAb, clone D6F3) with the immobilized atrazine was characterized using both crude ascitic fluid and Protein A-purified MAb preparates. The association and dissociation rate constants were determined, ka = 1.21 x 10(5) M-1S-1 and kd = 4.0 x 10(-4)S-1. The competitive determination of free atrazine was studied using different dilutions (100x, 250x and 1000x) of the ascitic fluid containing MAb. MAb was preincubated with atrazine (concentrations 0-1 microgram/l) for 15 min and the mixture was then introduced to the flow cell. As a signal, either the rate of frequency decrease or the relative change of frequency after the fixed binding period (10 min) was evaluated. As expected, the higher dilutions of MAb provided improved sensitivity for the analyte. For the 1000x diluted ascitic fluid, 0.1 and 1 microgram/l atrazine caused 5 and 30% decreases of the relative binding of MAb, respectively. Repeated use of the crystals was achieved using a 5 min flow of 100 mM NaOH for regeneration. The results obtained seem to be promising for determination of atrazine in drinking water using direct piezoelectric immunosensors.
PMID: 8976049

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