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In this work, a sensitive, universal and reusable electrochemical biosensor based on stannic oxide nanocorals-graphene hybrids (SnO2 NCs-Gr) is developed for target DNA detection by using two kinds of DNA enzymes for signal amplification through an autonomous cascade DNA duplication strategy. A hairpin probe is designed composing of a projecting part at the 3′-end as identification sequence for target,...
Excessive amount of aluminum is detrimental to growing plants or animals and people are likely to suffer from various diseases upon long-term exposure to aluminum ions. Therefore, sensitive and selective detection of trace amounts of Al3+ in real samples is of great importance. Herein, a ratiometric fluorescent probe for detecting aluminum ions based on pyrene-1-butyric acid (Py-L-COOH) was developed,...
A sandwich-type luminol electrochemiluminescence (ECL) aptasensor for highly sensitive and selective detection of platelet-derived growth factor BB (PDGF-BB) is fabricated. For this proposed ECL aptasensor, a multilayered AuNPs-electrochemically reduced graphene (AuNPs-EG) nanocomposite film was formed on the GCE surface as the base of the aptasensor through a co-electrodeposition method. The AuNPs-EG...
A multifunctional Ag nanoparticles (AgNPs)–polydopamine (Pdop)@graphene (Gr) composite was prepared by a simple and mild procedure. Gr was easily coated with Pdop at room temperature and then AgNPs was deposited by mildly stirring. The nanocomposite was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Guanine and adenine as model moleculars were employed...
An electrochemical strategy on the basis of rationally designed molecularly imprinted sol–gel polymer embedded with gold nanoparticles (AuNPs) is developed for the specific and sensitive determination of Sudan I. The rationally designed sensing Sudan I imprinted sol–gel was prepared by mixing Sudan I with 3-aminopropyltriethoxysilane, tetraethoxysilane, chitosan, and AuNPs, followed by copolymerization...
S-Nitrosothiols (RSNO) have been proved to be potent smooth muscle relaxants and inhibitors of platelet aggregation. It has been reported as the best candidate for the endogenous storage and transport of nitric oxide (NO) in vivo. Sensitive determination of RSNO in biosamples seems to be of great significance. In this work, a novel spectrofluorimetric method is proposed to determine RSNO. An excellent...
A new fluorescent probe 1,3,5,7-tetramethyl-2,6-dicarbethoxy-8-(3′,4′-diaminophenyl)-difluoroboradiaza-s-indacene (TMDCDABODIPY) has been developed to detect nitrite in meat products and vegetables. The fluorescence of TMDCDABODIPY is very weak, but when it reacts with nitrite, a strong fluorescent triazole forms in aqueous medium at room temperature, which offers the advantage of specificity and...
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