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Honghui Guo,Yun-yun Chen,Zhuan Hong,Yiping Zhang,Quanling Xie,Hui Chen 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.9
Small-molecular-weight collagen peptides (CPs) with high zinc-chelating ability were extracted from pufferfish skin. Chelation of CPs with zinc was performed to prepare novel CP-chelated zinc (CP-Zn) nanoparticles. CP-Zn nanoparticles were spherical, regular, and well dispersed with an average size of ∼100 nm. The zeta potential assay was used to explore the stability of CP-Zn nanoparticles. CP-Zn nanoparticles were much more stable in the pH range of 3–8. The structural properties of CP-Zn nanoparticles were characterized by matrix-assisted laser desorption–ionization time-of-flight mass spectrometry, Fourier transform infrared spectroscopy, and 1H nuclear magnetic resonance spectroscopy. The results indicated that CPs were chelated with Zn ions through the amino nitrogen and oxygen atoms from the carboxyl groups. Furthermore, the animal experiment results showed that CP-Zn nanoparticles were more effective in improving zinc bioavailability of Zn-deficient rats than zinc gluconate and zinc sulfate. The study demonstrated that CP-Zn nanoparticles were ideal for zinc supplementation.
Shaohuang Weng,Feng Feng,Honghui Guo,Namei Wu,Yanjie Zheng,Zhen Lin,Xinhua Lin 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.3
Gold nanoparticles (Au NPs)-based colorimetric assay for the highly sensitive and selective detection of glucose has been conducted. The sensing, which was based on the in situ growth of Au NPs in the presence of glucose, was developed with the solution changing from colorless to red. This change could be observed with the naked eye or a ultraviolet–visible (UV–vis) spectrophotometer. Moreover, adding trace amounts of Tween-20 kept Au NPs well spaced. Under the optimal assay conditions, the absorbance of Au NPs at 550 nm was proportional to glucose concentration within 400–1800 μM with a linear regression equation, and the detection limit was 6.28 μM. Some common interfering compounds in beverages, including other sugars, food additives, and amino acids, did not affect glucose sensing. Therefore, the proposed Au NP-based colorimetric assay could be successfully used to determine glucose in beverages.
Optimization of bayberry juice spray drying process using response surface methodology
Yongji Liu,Fengxia Chen,Honghui Guo 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.5
In this study, thirteen different runs according to the central composite design-response surface methodology were used to optimize the quality parameters of spray-dried bayberry juice powder. The independent variables were different levels of inlet air temperature (145.8–174.1 °C) and maltodextrin concentration (22.9–37.0%). The responses were process yield, moisture content, hygroscopicity, glass transition temperature (Tg), total color difference (ΔE), redness, retention of phenolics and anthocyanins, and antioxidant capacity. The optimum operation conditions for the highest Tg, redness, anthocyanins retention and antioxidant capacity with the lowest ΔE and hygroscopicity were obtained at inlet drying temperature of 150 °C and maltodextrin concentration of 31%. This study revealed that by applying these optimal conditions, bayberry juice powder with a 74.16% yield, 3.15% moisture content, 10.25% hygroscopicity, 41.15 °C Tg, 24.74 ΔE, 27.45 Hunter a redness, 89.55% anthocyanins retention, 77.71% phenolics retention, and 30.19 mmol Trolox equivalents/g antioxidant capacity was produced.