FOOD SCIENCE AND TECHNOLOGY RESEARCH
·
2021
·
IF 0.668
Yunbo Li,Benguo Liu,Mengmeng Yu,Sheng Geng
Cyclodextrins (CDs) are widely applied to improve the aqueous solubility and stability of nutraceuticals with the advantages of high safety and low cost. In this study, the binding capacities of CDs (α-CD, β-CD, maltosyl-β-CD, hydroxypropyl-β-CD and γ-CD) with mangiferin were compared by the phase solubility method and isothermal titration calorimetry. γ-CD could completely encapsulate mangiferin at the molar ratio of 1:1, which coincided with the molecular docking and ONIOM calculation results that γ-CD had the lowest interaction energy with mangiferin. The independent gradient model (IGM) visualized the intermolecular non-covalent binding and electrostatic potential around mangiferin during interaction. By complexing with γ-CD, mangiferin was molecularly dispersed in the matrix of γ-CD with its aromatic ring in the hydrophobic cavity. Compared with pure mangiferin, the mangiferin/γ-CD complex exhibited the stronger chemical antioxidant activities. The obtained result can promote the application of mangiferin and γ-CD in foods.
研究领域:
食品科学
·
药剂学
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产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 18
·9314-9320
·
IF 3.708
Xiangui Ding,Liu Bao,Jiang Jiang,Hongwei Gu
A facile method of synthesizing γ-Fe2O3 ultrathin nanoplates has been developed. These nanoplates are single crystalline and superparamagnetic at room temperature, with a thickness of only 1.4 nm. FTIR analysis has shown that the coordination mode between Fe and carboxyl group is dominated by bidentate configuration in the as prepared iron oleate complex, which is the key for producing the nanoplate morphology. By changing the reaction temperatures, the lateral size and thickness of nanoplates can be varied.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Yuanhong Chen,Kunpeng Chang,Xi Xie,Xiaohua Liu,Mengya Jia,Lijuan Nie,Haixing Li,Shuixing Wang
γ-aminobutyric acid (GABA) is a key physiologically active molecule in organisms. Separation of glutamate from its decarboxylated product GABA has been vigorously pursued. The interaction between these two compounds severely hindered their disassociation. Herein, we present a new strategy, termed zinc acetate-assisted differential precipitation/dissolution (ZA-DPD), for the removal of glutamate by step by step recovering pure GABA solution and discarding pure glutamate pellet, essentially attributed to the use of two core reagents (zinc acetate-assisted glutamate-precipitating reagent, and glutamate-rejecting reagent). In each precipitation, the zinc acetate-assisted glutamate-precipitating reagent guaranteed most GABA still soluble although the rest co-precipitated with glutamate; in the coupled dissolution, the co-precipitated GABA was fully dissolved with or without (in the case of glutamate-rejecting reagent used in the final dissolution) co-dissolution of glutamate. The process was repeated twice until glutamate was thoroughly removed. An accurate quantitative method coupling ZA-DPD with colorimetry was thereafter established for the determination of GABA. This study may facilitate the areas associated with GABA or glutamate.
研究领域:
生物化学
·
分析化学
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DOI
PubMed
高影响因子
CHEMISTRY LETTERS
·
2015
·Vol. 44
·期 4
·471-473
·
IF 1.23
Sun Jiadi,Meng Long,Zhu Ye,Cui Yan,Liu Xiaoya
Herein, gels composed of nanoscaled particles were obtained via one-step self-assembly of poly(γ-glutamic acid) (γ-PGA) and folic acid (FA). The outcomes show that the amount of added FA plays a crucial role in the liquid–gel transition. The resulting gels revealed an increase in both storage modulus (G′) and loss modulus (G′′) with increasing amount of FA. This paper describes an effective and promising strategy to prepare gels based on self-assembly of copolymers or particles in an organic medium.
研究领域:
材料科学
·
生物化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Lei Liu,Shi-Zhong Luo,Bin Wang,ZhanHu Guo
The interactions between poly(acrylic acid) (PAA) and alumina have been widely investigated. In this study, the pattern of small molecular weight PAA ( M W 3000) interaction with γ-alumina has been dissected. The alumina/PAA hybrids were prepared at pH 4.0, 5.5, and 7.0, respectively. Nitrogen absorption–desorption analysis, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and elemental analysis were conducted to illustrate the characteristics of the hybrids. At pH 4.0, the coiled PAA conformation yielded polymer adsorption primarily on alumina outer surface. At higher pH values, the more stretched PAA molecules were able to infiltrate inside the alumina pores. The phenomenon is explained by the polymer chain reptation motion model. Coiled polymer chains are not oriented enough to penetrate the oxide pore channels. In contrary, stretched polymer chains are more likely to move along the pore channels.
研究领域:
材料科学
·
表面化学
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产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 7
·2119
·
IF 4.927
Xue-Li Liu,Yi-Fan Chen,Jing-Jing Yang,Si-Jin Li,Hua-Le Xie,Tian-Lin Ma
A new type of hydroxyalkyl starch, γ-hydroxypropyl starch (γ-HPS), was prepared by etherification of alkali-activated starch with 3-chloropropanol. The reaction efficiency, morphological change, thermodynamic and apparent viscosity properties, and other physicochemical characteristics were described. The molar substitution (MS) of modified whole starch was determined to be 0.008, 0.017, 0.053, 0.106, and 0.178, with a ratio of 5%, 15%, 25%, 35%, and 45% 3-chloropropanol to starch (v/w), respectively. Compared to native starch, the granular size and shape and the X-ray diffraction pattern of γ-HPS are not very different. For low-substituted γ-HPS, the implications may be less evident. Thermal stability measurements by means of thermogravimetric analyses and differential scanning calorimetry (TGA-DSC) proved that thermal stability was reduced and water retaining capacity was increased after hydroxypropylation. Furthermore, the findings also showed that the solubility, light transmittance, and retrogradation of γ-HPS pastes could be improved by etherification. The greater the MS of the γ-HPS, the more its freeze–thaw stability and acid resistivity increased. In this study, we provide relevant information for the application of γ-HPS in food and non-food industries.Keywords:γ-hydroxypropyl starch;molar substitution;physicochemical properties
研究领域:
食品科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Meng Li,Xiao Zhang,Peng Wang,Ping Yang
Research on anion exchange reactions (AERs) indicated that the reaction rate has a significant influence on the photoluminescence properties and crystal structures of the resulting CsPb(Br/I)3 nanocrystals (NCs). Controllable AERs were achieved by controlling the reaction rate. Using controllable AERs, metastable γ-CsPbI3 NCs were directly obtained from the aged orthorhombic CsPbBr3 NCs. Rietveld refinement indicated that the crystal structure of parent CsPbBr3 was maintained without any phase transition or degradation. The prepared γ-CsPbI3 NCs exhibited good stability at room temperature. X-ray photoelectron spectroscopy analysis demonstrated the presence of Br and the high binding energy of Pb–Br bonding. Pb–Br bonds maintained the parent orthorhombic CsPbBr3 structure and increased the stability of γ-CsPbI3 NCs. Controllable AERs provide versatile methods to maintain the parent perovskite structure and synthesize CsPbI3 NCs with a more rigid crystal structure. They pave the way for the preparation of NCs, which are difficult to synthesize directly.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
BIOTECHNOLOGY PROGRESS
·
2019
·Vol. 36
·期 2
·e2930
·
IF 2.406
Hangyan Ji,Yu Wang,Yuxiang Bai,Xiaoxiao Li,Lizhong Qiu,Zhengyu Jin
The production of γ-cyclodextrin usually includes the utilization of organic complexants. However, the non-complexant production of γ-cyclodextrin is always being explored due to the defects of organic complexants. However, in non-complexant production, the separation of γ-cyclodextrin from α- and β-cyclodextrin is still a challenge. Here, the selective hydrolysis ability of a cyclodextrinase designated PpCD (cyclodextrinase from Palaeococcus pacificus ) on α-cyclodextrin, β-cyclodextrin, and γ-cyclodextrin was proved. The k cat /K m values of PpCD for α-cyclodextrin and β-cyclodextrin were roughly 12-fold and 5-fold higher than that of γ-cyclodextrin. It was proved that PpCD had selective hydrolysis ability and its γ-cyclodextrin purification performance was apparent on various simulated cyclodextrin mixtures with reported proportions derived from different CGTases. Besides, the hydrolysis temperature was optimized and it could be seen that 85°C was appropriate for the production of γ-cyclodextrin. In addition, the production of γ-cyclodextrin was achieved by using PpCD in the γ-CGTase reaction products.
研究领域:
生物化学
·
酶工程
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2012
·
IF 4.98
Yan Zhao,Yao Fu,Qing-Xiang Guo
In the present study, γ-valerolactone (GVL) is firstly reported to be converted into aromatic hydrocarbons through catalytic pyrolysis . The catalysts and reaction conditions are both critical in maximizing the hydrocarbon selectivity . Four zeolites , i.e. MCM-41, β-zeolite, ZSM-5 and HZSM-5 were tested in this work, among which HZSM-5 (Si/Al = 25) was found to be the most effective catalyst in both reactivity and selectivity. Under the reaction temperature of 500 °C, the highest carbon yield of 56.71% of aromatics was achieved from GVL with HZSM-5 (Si/Al = 25) as catalyst. Moreover, the HZSM-5 catalyst was recycled for five times without significant decrease in product selectivity.
研究领域:
能源与燃料
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Liu Hao,Xiong Zhengye,Chen Qingxiang,Wang Luyan,Wang Chunxi
To evaluate the effect of irradiation on the preservation of potatoes, fresh potatoes were selected as the irradiation objects, and irradiated with 60 Co- γ radiation source for 0, 100, 200, 500 and 1000 Gy, respectively. During the irradiation, the well-packaged Y 1.79 Bi 0.01 Eu 0.2 MgTiO 6 novel thermoluminescence dosimeter material was placed together with the potatoes at the same position. Then, the potatoes were stored in the same temperature and humidity environment, and the quality changes of the potatoes were observed. The Y 1.79 Bi 0.01 Eu 0.2 MgTiO 6 material had good performance indicators, and was used to measure the irradiation dose of the potatoes. The experiment showed that irradiation could appropriately extend the storage time of potatoes, and gamma irradiation of about 1000 Gy could achieve the best preservation effect. The main pathogenic fungi that cause dry rot of potatoes were Fusarium solani and Fusarium oxysporum , and the appropriate dose of 60 Co- γ irradiation could effectively inhibit the spread and growth of these fungi.
研究领域:
食品科学
·
植物病理学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 4
·506
·
IF 4.034
Shuquan Chang,Xian Wu,Jianzhang Lan,Zheng Li,Xiaohong Zhang,Haiqian Zhang
Quantum dots (QDs) have attracted great attention due to their unique optical properties. High fluorescence efficiency is very important for their practical application. In this study, we report a simple and efficient strategy to enhance the photoluminescence of water-dispersed thiol-capped QDs using γ-radiation. Three kinds of QDs with different surface ligands and cores (MPA-CdTe, MPA-CdSe and Cys-CdTe) were fabricated and irradiated by high-energy γ-ray in an aqueous solution. Their photoluminescence intensities were significantly enhanced after irradiation, which were closely related to the radiation dose and the structure of QDs. The positions of the fluorescence emission peaks did not shift obviously after irradiation. The mechanism of photoluminescence enhancement was discussed based on the results of photoluminescence (PL) spectra, UV-visible light absorption (UV-vis) spectra, transmission electron microscope (TEM), X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). This method can be employed to uniformly treat large batches of QDs at room temperature and without other chemicals.Keywords:quantum dots;luminescence enhancement;γ-radiation;thiol-capped
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Forensic Chemistry
·
2022
·
IF 3.096
Chao Huang,Jingyu Wang,Jingruolan Lin,Wei Huang,Yi He
Simple and convenient detection of 2,4,6‑trinitrotoluene (TNT) explosive is of great importance for public security and environmental protection. Herein we report the fabrication of a supramolecular visual colorimetric assay for TNT based on γ-cyclodextrin (γ-CD) molecular container. The hydrophobic cavity of γ-CD can encapsulate the hydrophobic TNT molecular because the molecular size of TNT is smaller than that of γ-CD. The γ-CD-TNT inclusion complex can react with NaOH to generate colored Meisenheimer complexes with enhanced absorption capacity, enabling highly sensitive colorimetric detection of TNT. Under optimal experimental parameters, the present visual colorimetric method displays a linear dynamic range of 0–200 μM with a detection limit of 0.8 μM, which shows 2-fold enhancement in the sensitivity compared with the γ-CD-free detection system. When the TNT concentration reaches 10 μM, it is discernible by the naked eye. Moreover, this assay is highly selective to TNT and applied for real water and soil samples. The spiked recoveries vary from 91.5% to 100%, demonstrating the potential practical applications.
研究领域:
化学
·
环境科学
·
公共安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）