HPTLC-bioautography/SERS screening nifedipine adulteration in food supplement based on Ginkgo biloba

Publication date: Available online 15 January 2020Source: Microchemical JournalAuthor(s): Yisheng Chen, Caihong Huang, Zhengyu Jin, Xueming Xu, Yina Cai, Yuxiang BaiAbstractGinkgo biloba was a popular phytomedicine as the essential ingredient of many food supplement. In this work, a bio-inspired HPTLC method was proposed for the visualized screening of nifedipine adulteration in food supplement based on Gingko biloba. To customize the visualization of the analyte by inhibiting bacterium (Photobacterium phosphoreum) bioluminescence, the silica gel plate that gives the highest detectability was selected as the stationary phase of separation. Thereafter, the HPTLC procedure (toluene and ethyl acetate 8/2, v/v, as the mobile phase, to a distance of 60 mm) was optimized and standardized as a sample cleanup tool to exclude noises caused by bioactive co-extracts. Then, the separation result fixed on the plate layer was selectively visualized as dark bands against the white background, only after 6 min exposure. To achieve quantitation of the obtained HPTLC images, an enhanced quantitative analysis was optimized via software (ImageJ) facilitated pixel scanning, offered remarkable sensitivity (LOD=24.0 μg/g), linearity (R2=0.9985 within 50-300 ng/band) and precision (RSD
Source: Microchemical Journal - Category: Chemistry Source Type: research

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Source: Polymer Testing - Category: Chemistry Source Type: research
Publication date: Available online 20 February 2020Source: PolymerAuthor(s): Akihiko Toda, Ken Taguchi, Koji Nozaki, Xinchao Guan, Wenbing Hu, Yoshitomo Furushima, Christoph SchickAbstractThe crystallization and melting behaviors of poly(butylene terephthalate) (PBT) and poly(ethylene terephthalate) (PET) were examined by Hoffman-Weeks (H–W), Gibbs-Thomson (G-T), and thermal Gibbs-Thomson (t-G-T) plots constructed by using fast-scan calorimetry and small-angle X-ray scattering. With PBT and PET, neither an H–W nor a G-T plot could be utilized for the determination of the equilibrium melting point (TM0) of chain...
Source: Polymer - Category: Chemistry Source Type: research
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Nabilah Al-Ansi, Abdulwahab Salah, Mbage Bawa, Salah Adlat, Iram Yasmin, Ayman Abdallah, Bin QiAbstractIn this work, three-dimensional nitrogen-doped porous graphene aerogel (NPGA) was easily synthesized via one-step hydrothermal reduction by mixing graphene oxide (GO) with p-phenylenediamine (PPD) and ammonia solution and then followed by freeze-dried. The NPGA sample was studied by different techniques such as SEM, TEM, nitrogen adsorption-desorption isotherms, XRD, XPS, and electrochemical measurements. NPGA composite exhibits a microporous w...
Source: Microchemical Journal - Category: Chemistry Source Type: research
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): G.H. Li, Y. Chen, X.J. Sun, P.Q. Duan, Y. Lei, L.F. ZhangAbstractChinese scroll painting is one of the oldest continuous artistic traditions in the world. These paintings are characterized by brushwork, pigment category and painting style. In order to nondestructively investigate the techniques of large-scale Chinese scroll paintings, an automatic hyperspectral scanning system, composed of a hyperspectral camera, a halogen light source, an automatic scanning platform, data processing software and a reference spectral library, was set up. This sy...
Source: Microchemical Journal - Category: Chemistry Source Type: research
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Source: Journal of Electroanalytical Chemistry - Category: Chemistry Source Type: research
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Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
In this study, the effects of hafnium addition on the microstructure and mechanical properties of CoCrFeNi high entropy alloy were investigated. The CoCrFeNiHfx (x = 0, 0.1, 0.2, 0.3 and 0.4, x values in molar ratio) high entropy alloys were prepared by vacuum arc melting. The microstructure and phase identities were studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. With increasing Hf contents, the structure of CoCrFeNiHfx HEAs changed from FCC single phase to Ni7Hf2 + FCC, then to Ni7Hf2 + C15 Laves + FCC, and finally to C15 Laves ...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
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Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
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Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
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Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
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