Document Detail

Electrochemical immunosensor for norethisterone based on signal amplification strategy of graphene sheets and multienzyme functionalized mesoporous silica nanoparticles.
MedLine Citation:
PMID:  20663658     Owner:  NLM     Status:  In-Process    
Norethisterone is one kind of widely used anabolic steroid hormones which can help to promote livestock growth and sometime has been illegally used for livestock breeding. The residues of norethisterone in animal food will harm people's health, therefore, it has been banned to use for the growth promotion purposes in livestock. In this study, amino-group functionalized mesoporous silica nanoparticles (MSN) were prepared and used to immobilize Au nanoparticles, which was further utilized for the adsorption of horseradish peroxidase (HRP) and the secondary antibody (Ab2). The resulting nanoparticles, Au-MSN-HRP-Ab2 were used as labels for immunosensors to detect norethisterone antigen. A sandwich-type protocol was used to prepare the immunosensor with the primary antibody (Ab1) immobilized onto thionine (TH) and graphene sheet (GS) modified glassy carbon electrode surface. The sensitivity of the sandwich-type immunosensor using Au-MSN-HRP-Ab2 as labels for norethisterone antigen detection was much higher than that using either Au-MSN-Ab2 or MSN-HRP-Ab2 as labels. Within norethisterone concentration range (0.01-10 ng/mL), a linear calibration plot (Y=0.55671+8.27101X, r=0.9993) was obtained with a detection limit of 3.58 pg/mL under optimal conditions. The proposed immunosensor shows good reproducibility, selectivity, and acceptable stability. This new type of labels for immunosensors may provide many potential applications for the detection of growth hormone in animal derived food.
Qin Wei; Xiaodong Xin; Bin Du; Dan Wu; Yanyan Han; Yanfang Zhao; Yanyan Cai; Ru Li; Minghui Yang; He Li
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-03
Journal Detail:
Title:  Biosensors & bioelectronics     Volume:  26     ISSN:  1873-4235     ISO Abbreviation:  Biosens Bioelectron     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9001289     Medline TA:  Biosens Bioelectron     Country:  England    
Other Details:
Languages:  eng     Pagination:  723-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
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