char = A;code = 65
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = v;code = 118
char = e;code = 101
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char = ;code = 32
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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
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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 = a;code = 97
char = c;code = 99
char = e;code = 101
char = t;code = 116
char = y;code = 121
char = l;code = 108
char = -;code = 45
char = c;code = 99
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = n;code = 110
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char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = i;code = 105
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 = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = g;code = 103
char = o;code = 111
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = o;code = 111
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char = p;code = 112
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = .;code = 46
result sql = A novel and highly sensitive acetyl-cholinesterase biosensor modified with hollow gold nanospheres.
A novel and highly sensitive acetyl-cholinesterase biosensor modified with hollow gold nanospheres.
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
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char = w;code = 119
char = o;code = 111
char = r;code = 114
char = k;code = 107
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char = ;code = 32
char = a;code = 97
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 = s;code = 115
char = e;code = 101
char = n;code = 110
char = s;code = 115
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char = t;code = 116
char = i;code = 105
char = v;code = 118
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char = a;code = 97
char = c;code = 99
char = e;code = 101
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char = y;code = 121
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char = o;code = 111
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char = i;code = 105
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char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = e;code = 101
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char = (;code = 40
char = A;code = 65
char = C;code = 67
char = h;code = 104
char = E;code = 69
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char = i;code = 105
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char = i;code = 105
char = t;code = 116
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char = a;code = 97
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char = d;code = 100
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char = c;code = 99
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char = b;code = 98
char = i;code = 105
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char = e;code = 101
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char = s;code = 115
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char = r;code = 114
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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
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char = d;code = 100
char = e;code = 101
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char = o;code = 111
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char = F;code = 70
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char = a;code = 97
char = ;code = 32
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char = l;code = 108
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = y;code = 121
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char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
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 = o;code = 111
char = d;code = 100
char = e;code = 101
char = ;code = 32
char = (;code = 40
char = G;code = 71
char = C;code = 67
char = E;code = 69
char = );code = 41
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
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char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
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char = h;code = 104
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char = (;code = 40
char = C;code = 67
char = h;code = 104
char = i;code = 105
char = t;code = 116
char = s;code = 115
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char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = ,;code = 44
char = ;code = 32
char = h;code = 104
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char = l;code = 108
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = g;code = 103
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char = d;code = 100
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char = n;code = 110
char = a;code = 97
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = p;code = 112
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = H;code = 72
char = G;code = 71
char = N;code = 78
char = s;code = 115
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char = ;code = 32
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char = e;code = 101
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char = i;code = 105
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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
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
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char = a;code = 97
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char = f;code = 102
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char = g;code = 103
char = h;code = 104
char = ;code = 32
char = e;code = 101
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char = e;code = 101
char = c;code = 99
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char = s;code = 115
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char = a;code = 97
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char = i;code = 105
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char = a;code = 97
char = d;code = 100
char = s;code = 115
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char = p;code = 112
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char = i;code = 105
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char = .;code = 46
char = ;code = 32
char = A;code = 65
char = f;code = 102
char = t;code = 116
char = e;code = 101
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char = t;code = 116
char = h;code = 104
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char = t;code = 116
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char = L;code = 76
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char = e;code = 101
char = ;code = 32
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char = ;code = 32
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char = a;code = 97
char = s;code = 115
char = s;code = 115
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char = ;code = 32
char = o;code = 111
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char = H;code = 72
char = G;code = 71
char = N;code = 78
char = s;code = 115
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char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = A;code = 65
char = u;code = 117
char = -;code = 45
char = S;code = 83
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = o;code = 111
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char = l;code = 108
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char = g;code = 103
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char = C;code = 67
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char = n;code = 110
char = o;code = 111
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char = s;code = 115
char = ;code = 32
char = s;code = 115
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char = O;code = 79
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char = d;code = 100
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char = G;code = 71
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char = .;code = 46
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char = d;code = 100
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result sql = In this work, a highly sensitive acetylcholinesterase (AChE) inhibition-based amperometric biosensor has been developed. Firstly, a glassy carbon electrode (GCE) was modified with chitosan (Chits). Then, hollow gold nanospheres (HGNs) were absorbed onto the surface of chitosan based on the strong affinity through electrostatic adsorption. After that, L-cysteine (L-cys) was assembled on HGNs through Au-S bond. The hollow gold nanospheres were prepared by using Co nanoparticles as sacrificial templates and characterized by scanning electron microscopy, transmission electron microscopy and ultraviolet spectra, respectively. Finally, AChE was immobilized with covalent binding via -COOH groups of L-cysteine onto the modified GCE. The AChE biosensor fabrication process was characterized by cyclic voltammetry and electrochemical impedance spectroscopy methods with the use of ferricyanide as an electrochemical redox indicator. Under optimum conditions, the inhibition rates of pesticides were proportional to their concentrations in the range of 0.1-150 and 0.1-200 μg L(-1) for chlorpyrifos and carbofuran, respectively, the detection limits were 0.06 μg L(-1) for chlorpyrifos and 0.08 μg L(-1) for carbofuran. Moreover, the biosensor exhibited a good stability and reproducibility and was suitable for trace detection of pesticide residues in vegetables and fruits.

Publication: Bioprocess Biosyst Eng 2013 Mar ;36(3)::273-83. :doi: 10.1007/s00449-012-0782-5.
Publication Date: 2013 Mar
Study Author(s): Sun, Xia;Zhai, Chen;Wang, Xiangyou;
Institution: School of Agriculture and Food Engineering, Shandong University of Technology, NO. 12, Zhangzhou Road, Zibo, 255049, Shandong, People's Republic of China. [email protected]
Shortcut link to this study:
In this work, a highly sensitive acetylcholinesterase (AChE) inhibition-based amperometric biosensor has been developed. Firstly, a glassy carbon electrode (GCE) was modified with chitosan (Chits). Then, hollow gold nanospheres (HGNs) were absorbed onto the surface of chitosan based on the strong affinity through electrostatic adsorption. After that, L-cysteine (L-cys) was assembled on HGNs through Au-S bond. The hollow gold nanospheres were prepared by using Co nanoparticles as sacrificial templates and characterized by scanning electron microscopy, transmission electron microscopy and ultraviolet spectra, respectively. Finally, AChE was immobilized with covalent binding via -COOH groups of L-cysteine onto the modified GCE. The AChE biosensor fabrication process was characterized by cyclic voltammetry and electrochemical impedance spectroscopy methods with the use of ferricyanide as an electrochemical redox indicator. Under optimum conditions, the inhibition rates of pesticides were proportional to their concentrations in the range of 0.1-150 and 0.1-200 μg L(-1) for chlorpyrifos and carbofuran, respectively, the detection limits were 0.06 μg L(-1) for chlorpyrifos and 0.08 μg L(-1) for carbofuran. Moreover, the biosensor exhibited a good stability and reproducibility and was suitable for trace detection of pesticide residues in vegetables and fruits.
PMID: 22829062

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