In this work, a simple gold nanoparticles (AuNPs) based colorimetric biosensor was developed for chlorpyrifos (Chl) detection using an aptamer as the capture probe. The Chl-aptamer with low dissociation constant (Kd) of 58.59 ± 6.08 nmol/L selected by ssDNA library immobilized systematic evolution ligands enrichment (SELEX). absence Chl, acted stabilizer AuNPs in salt solution. presence highly ...

The paper presents research results on the colorimetric behavior of impregnated fibrous chemisorbents (IFCS) basic gases with visual identification dynamic absorption capacity “response” moment (IFCS-I) during ammonia. Chemisorbents were obtained by impregnation carriers polybasic hydroxyl acid aqueous solutions adding acid-base indicators (Ind). IFCS-I based oxyethylenediphosphonic (IFCS-OEDPA...

Fluoride is beneficial to human health in small quantities; it plays vital roles in preventing dental decay and in treating osteoporosis. In contrast, excess fluoride consumption can cause dental fluorosis or mottled enamel and skeletal fluorosis, a bone disease that is a major problem in India. It has been reported that an excess of fluoride can cause the inhibition of over 100 different enzym...

The detection of amplified products resulting from polymerase chain reactions (PCRs) remains a complicated process. To simplify the detection procedures, we developed a colorimetric microtiter plate hybridization assay for the specific detection of 5'-biotinylated PCR fragments of Mycobacterium leprae DNA. For this assay, an M. leprae DNA capture probe was made and immobilized on the wells of a...