We have developed a paper-based analytical device as a platform for colorimetric detection of pathogenic bacteria responsible for foodborne illness. The food industry currently relies on time-consuming and complex analysis techniques to determine the presence of live Escherichia coli, Listeria monocytogenes, and Salmonella enterica in food products. Advantages of the paper-based design include ...

We presented the colorimetric and electrochemical methods for determination of the dipeptidyl peptidase-IV (DPP-IV) activity and screening of its inhibitor using gold nanoparticle (AuNP) as the probe. In the colorimetric assay, the substrate peptide with a sequence of Arg-Pro-Arg induced the aggregation and color change of AuNPs, whereas cleavage of the peptide by DPP-IV prevented the aggregati...

Abstract The accuracy of the titration device for colorimetric water quality analysis is key to its detection accuracy. In order solve problem excessive traditional Chinese medicine in method, a structure optimization scheme micro-peristaltic pump applied analyzer was designed. By analyzing phenomenon periodic backflow and “creep” tube when peristaltic working, changed from circular section an ...

We report a convenient melamine detection system based on polydiacetylene (PDA) liposomes having rapid, selective, and sensitive detection, and dual signal capabilities. The detection limit of the sensory PDA liposome is 1 and 0.5 ppm in the colorimetric and the fluorescence detection schemes, respectively, satisfying the world regulation level.

background: in human, sry (sex-determining region of the y chromosome) is the major gene for the testis-determining factor which is found in normal xy males and in the rare xx males, and it is absent in normal xx females and many xy females. there are several methods which can indicate a male genotype by the presence of the amplified product of sry gene. the aim of this study was to identify th...