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Ochratoxin A(OTA) is found to be one of the predominant contaminating mycotoxins in a wide variety of food commodities. To avoid the risk of OTA consumption, the detection and quantitation of OTA level are of great significance. Based on the fact that ssDNA aptamer has the ability to form a double-strand structure with its complementary sequence, a simple(More)
A facile and universal aptamer-based label-free approach for highly selective and sensitive fluorescence detection of a broad range of targets including small molecules, inorganic ions and proteins was developed by using PicoGreen to transduce the fluorescent signal of the double stranded DNA duplex formed between a free aptamer and its complementary strand.
Quickly and sensitively detection of antibiotic residues in animal products often requires time-consuming techniques and expensive instrumentation. To address these limitations, a high sensitive aptasensor for sulfadimethoxine (SDM) using unmodified gold nanoparticles (AuNPs) was developed in the present study. The assay sensitivity was improved by(More)
Colorimetric aptasensors using unmodified gold nanoparticles (AuNPs) have attracted much attention because of their low cost, simplicity, and practicality, and they have been developed for various targets in the past several years. However, previous research has focused on developing single-target assays. Here, we report the development of a homogeneous(More)
Gold nanoparticles (AuNPs) based fluorescence quenching or colorimetric aptasensor have been developed for many analytes recently largely because of the ease of detection, high sensitivity, and potential for high-throughput analysis. However, the effects of remnant non-AuNPs components in the colloid gold solution on these assays performance remain unclear.(More)
By analyzing and researching several digital chaotic image encryption algorithms, this paper designs a symmetric image encryption scheme based on the threedimensional Henon chaotic map and the general Cat chaotic map. In this scheme, the chaotic sequence of general Cat map is used as the initialization sequence to confuse the positions of image pixels; the(More)
This paper analyzes a new image encryption scheme proposed in "A new encryption based on Henon mapping" and proves that this encryption algorithm is insecure in the image-known attack. By analyzing the properties of the round function, there are two weaknesses: on the one hand, the confusing process will not completely destroy the correlation of image(More)
The ability to detect sequence-specific single-strand DNA (ssDNA) in complex, contaminant-ridden samples, using a fluorescent method directly without a DNA extraction and PCR step could simplify the detection of pathogens in the field and in the clinic. Here, we have demonstrated a simple label-free sensing strategy to detect ssDNA by employing its(More)
In the present study, konjac glucomannan (KGM) was degraded by H2O2, and then used trisulfonated sodium amine and HCl, individually, to obtain two kinds of derivatives: oxidized konjac glucomannan sulfates (OKGMS) and acidolysis-oxidized konjac glucomannan (A-OKGM). The effects of two OKGM modified products on the immune parameters and expressions of(More)
High quality (monodisperse and well-defined) scandium based ternary fluoride nanocrystals of NaScF4 and KSc2F7 were successfully fabricated via a one-pot colloidal synthesis method. These nanocrystals can play the part of hard Lewis acid catalysts by providing Lewis acid sites on account of the unique electronic structure, i.e. the ability of polarizing(More)