JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 15
·7249-7258
·
IF 4.125
He Li,Fu-Han Yang,Wen-Chao Zhang,Zhi-Jun Zhang,Shu-Juan Yu
BACKGROUND 2,3-Dihydro-3,5-dihydroxy-6-methyl-4( H )-pyran-4-one (DDMP) and 5-hydroxymethylfurfural (HMF) are two main enolization products in the Maillard reaction and found in some foodstuffs. For many years, whether they are functional or noxious to human health has been a matter of debate. Thus, insight into their formation pathways is important to manage Maillard reaction products. In this study, DDMP and HMF were quantified and compared with regard to their formation and degradation in the d -glucose and l -proline Maillard reaction models using different moisture contents (0, 0.1, 0.5, 1.0, and 4.0 mL) at 150 °C for various heating times. RESULTS DDMP was predominantly generated in dry or low water-content heating models along with n increased 1-deoxyglucosone (1-DG) generation via 2,3-enolization. However, increasing moisture content resulted in a decay of reaction intensity, 1-DG, and DDMP due to a change in the reaction mechanism from 2,3-enolization to 1,2-enolization, which facilitated 3-deoxyglucosone (3-DG) and HMF formation. CONCLUSION Increased moisture content in glucose–proline models reduced reaction intensity and also inhibited DDMP and facilitated HMF formation by promoting the pathway change from 2,3-enolization to 1,2-enolization to generate more 3-DG. A water content of 1.0 mL was identified as a critical value, from which the 1,2-enolization became a primary pathway occurring in the Maillard reaction. © 2022 Society of Chemical Industry.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chinese Physics B
·
2016
·Vol. 25
·期 7
·078106
·
IF 1.436
Xu Yan,Miao Yu,Wen-Peng Han,Ming-Hao You,Jun-Cheng Zhang,Rui-Hua Dong,Hong-Di Zhang,Yun-Ze Long
Electrospun nanofibers with designed or controlled structures have drawn much attention. In this study, we report an interesting new closed-loop structure in individual cerium nitrate/polyvinyl alcohol (Ce(NO3)3/PVA) and NaCl/PVA fibers, which are fabricated by electrospinning with a nail collector. The electrospinning parameters such as voltage and Ce(NO3)3 (or NaCl) concentration are examined for the formation of the closed-loop structure. The results suggest that the increase of the spinning voltage or addition of Ce(NO3)3 (or NaCl) is favorable for the formation of the closed-loop structure, and the increase of loop numbers and the decrease of loop size. Further analyses indicate that the formation mechanism of the closed-loop fibers can be predominantly attributed to the Coulomb repulsion in the charged jets.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·110510
·
IF 4.316
Ning Yan,Lei Ding,Tong Wu,Sihang Zhang,Feng Yang,Ya Cao,Ming Xiang
The thermal shutdown of the separator is the crucial feature for hindering thermal runaway of lithium-ion batteries. Because the temperature within the cell continues to rise rather than drop immediately after shutdown, the separator should be capable of maintaining adequate dimensional stability up to a specific range above the shutdown temperature to prevent internal short circuits. Based on this, a composite separator with high shutdown temperature and a wider shutdown temperature window was fabricated based on the non-solvent induced phase separation process of poly ethylene-vinyl alcohol sulfonate lithium (EVOH-SO3Li) and poly (vinyl alcohol) (PVA). The scanning electron microscope, pore size analysis, and wettability test results show that the composite separator possesses a uniform micron-sized porous structure and excellent electrolyte affinity owing to the abundant hydroxyl and sulfonic acid groups. Hence, the composite separator obtains the optimized electrochemical performances. The cell assembled with the composite separator also exhibits superior discharge C-rate capacity and cycle stability. In addition, the composite separator displays a higher shutdown function of 155 °C and maintained sufficient dimensional integrity below 213 °C, which is conducive to fabrication of lithium-ion batteries with adequate security feature and ideal cycle ability.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1400
·
IF 4.967
Mengwen Sun,Yajuan Wang,Lihui Yao,Ya Li,Yunxuan Weng,Dan Qiu
In this study, porous scaffold materials based on polyvinyl alcohol (PVA) and gelatin (Gel) were successfully fabricated and characterized. The mechanism of the reaction, morphology, and crystallinity were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). In addition, thermogravimetric analysis (TGA) was performed together with differential scanning calorimetry (DSC) for examining the thermostability and phase transformation of the scaffolds. Degradation and swelling studies of PVA/Gel composite scaffold materials were performed in phosphate-buffered saline. Finally, the mechanical performances had been determined. According to the results, the polymer matrix that was formed by the combination of PVA and gelatin had better thermal stability. The synthesized composite scaffold was amorphous in nature. The addition of gelatin did not affect the fishbone-like microstructure of PVA, which ensures the excellent mechanical properties of the PVA scaffold. The denaturation temperature and elastic modulus of the PVA scaffold were improved by the gelatin addition, but the physical and chemical properties of the PVA scaffold were weakened when the gelatin content exceeded 10%. In addition, the PVA-10G sample has suitable degradability. Therefore, the PVA/Gel composite scaffold might potentially be applied in the field of tissue engineering that demands high strength.Keywords:polyvinyl alcohol;gelatin;porous scaffold
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 1
·362
·
IF 4.6
Shi-Hui Lu,Hao-Jiang Zuo,Jing Huang,Wei-Neng Li,Jie-Lian Huang,Xiu-Xia Li
The leaves ofLigustrum robustumhave been consumed as Ku-Ding-Cha for clearing heat and removing toxins, and they have been used as a folk medicine for curing hypertension, diabetes, and obesity in China. The phytochemical research on the leaves ofL. robustumled to the isolation and identification of two new hexenol glycosides, two new butenol glycosides, and five new sugar esters, named ligurobustosides X (1a), X1(1b), Y (2a), and Y1(2b) and ligurobustates A (3a), B (3b), C (4b), D (5a), and E (5b), along with seven known compounds (4aand6–10). Compounds1–10were tested for their inhibitory effects on fatty acid synthase (FAS), α-glucosidase, and α-amylase, as well as their antioxidant activities. Compound2showed strong FAS inhibitory activity (IC504.10 ± 0.12 μM) close to that of the positive control orlistat (IC504.46 ± 0.13 μM); compounds7and9revealed moderate α-glucosidase inhibitory activities; compounds1–10showed moderate α-amylase inhibitory activities; and compounds1and10displayed stronger 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) ammonium salt (ABTS) radical scavenging effects (IC503.41 ± 0.08~5.65 ± 0.19 μM) than the positive controll-(+)-ascorbic acid (IC5010.06 ± 0.19 μM). This study provides a theoretical foundation for the leaves ofL. robustumas a functional tea to prevent diabetes and its complications.Keywords:Ligustrum robustum;hexenol glycoside;butenol glycoside;sugar ester;FAS;α-glucosidase;antioxidant;antiobesity;hypoglycemic
研究领域:
植物化学
·
药理学
·
代谢疾病研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yan Shi,Wei Xu,Dawei Ni,Wenli Zhang,Cuie Guang,Wanmeng Mu
Deoxynivalenol (DON) poses a significant threat to human health due to its widespread distribution and biological toxicity. Here, we identified a novel DON-degrading enzyme from Youhaiella tibetensis ( Yo DDH). Yo DDH exhibited the highest activity against DON at pH 4.5 and 40 ℃, in the presence of Ca 2+ and the pyrroloquinoline quinone (PQQ). Additionally, Yo DDH displayed remarkable thermostability at 40 ℃, with a half-life of 24 h and a T m value of 48.5 ℃. Notably, phenazine methosulfate (PMS) and 2,6-dichlorophenolindophenol (DCPIP) can also serve as electron acceptors for Yo DDH. After incubation in the optimal conditions for 3 h, Yo DDH degraded 73 % of DON (100 μM) finally. The k cat and k cat / K m of Yo DDH towards DON was determined as 1.65 s −1 and 1526 M −1 ·s −1 in the presence of PMS. The 3-keto-DON was verified as the degradation product. This identified Yo DDH presents a promising candidate for DON decontamination in the food and feed industry.
研究领域:
食品安全
·
微生物学
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 11
·9338-9343
·
IF 3.289
X. W. Chen,S. M. Dong,Y. M. Kan,H. J. Zhou,J. B. Hu,Y. S. Ding
Boron carbide (B4C) powder was synthesized by heating a gel precursor with pyrolysis and carbothermal processes. The gel precursor was prepared by the condensation reaction of boric acid (H3BO3) and polyvinyl alcohol (PVA) at a weight ratio of 1/2 with the addition of various amounts of glycerine. The effects of glycerine addition on the synthesis of B4C powder were studied. It was observed that glycerine could promote the condensation reaction and resulted in a pyrolyzed precursor with a much finer distribution of B2O3 in the carbon matrix. This led to a significant reduction of residual free carbon in the B4C powder. Moreover, the morphology of the B4C powder was also found to be closely related to the glycerine addition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Food Biophysics
·
2020
·Vol. 15
·期 4
·452-462
·
IF 2.387
Zeng Chaoxi,Wan Zheng,Xia Huiping,Zhao Haiyang,Guo Shiyin
In this study, naturally occurring ingredient diosgenin was utilized as an organogelator for structuring canola oil. Results show that stable diosgenin-based organogel can be obtained at only 2% of diosgenin concentration when the gel preparation temperature is 100 °C. Oil binding capacity and rheological properties of the organogel were investigated. Results demonstrate that these two macroscopic characteristics of the organogels can be significantly modified by simply changing the gel preparation temperature or diosgenin concentration. When the preparation temperature was 120 °C and the diosgenin concentration higher than 4%, oil binding capacity of at least 90% were obtained. Furthermore, higher gel preparation temperature resulted in higher G′values of the diosgenin-based organogels. According to the results analyzed by polarized light microscopy, XRD and FT-IR, it can be found that the possible gelation mechanism of the diosgenin-based organogels is formation of supramolecular structures by self-assembly of diosgenin molecule crystals via hydrogen bonding interaction. Varying gel preparation conditions of the organogels lead to self-assembly of diosgenin molecules to form different microstructures. Therefore, diosgenin can be considered as a good organogelator for producing functional organogel from canola oil. The novel diosgenin-based organogel is expected to be widely used in bio-related fields such as food and pharmaceutical industries.
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
CyTA-Journal of Food
·
2019
·
IF 1.605
Min Pang,Lulu Cao,Lili Cao,Yi She,Hualin Wang
The properties of manufactured nisin-ZrO2/poly (vinyl alcohol)-wheat gluten (ZPWG) films were characterized. The formation of hydrogen bonds among the PVA, WG, and ZrO2 units were detected and caused a decrease in the film crystallinity. Also, the degradation rate was increased with WG content. As expected, the addition of WG and ZrO2 influenced the light transmission, tensile properties, gas permeability and water vapor permeability of the films. Nisin-loaded films presented a low initial burst release of the antimicrobial agent, followed by a gradual release. The initial diffusion of nisin (Mt/M∞<2/3) from the ZPWG film was formulated by the Fickian diffusion equation, showing a linear relationship (R2 > 0.998) between Mt/M∞ and t1/2, and the diffusion coefficient D increased with increasing WG content. Antimicrobial activity testing of nisin-ZPWG films with 40 wt% WG showed excellent inhibitory activity against Staphylococcus aureus, indicating its potential as a new active food packaging material.
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Ruilong Jia,Binbin Zhao,Wenjie Xue,Lei Liu,Jinxiang Dong
Formic acid-mediated deoxydehydration of glycerol has emerged as an attractive approach to produce allyl alcohol; however, separation of allyl alcohol by distillation is not a straightforward task from the mixture of allyl alcohol, formic acid, and water because of their very close boiling point. A new route to separate allyl alcohol with high purity has been developed by the precipitation, distillation, and salting-out process. Among 11 salts, NaCl, K2HPO4, and K2CO3 could easily induce the liquid–liquid phase splitting. K2CO3 exhibits the best salting-out effect in a single salt system. Meanwhile, the solubility of allyl alcohol in the organic phase could be predicted by the mass fraction of salt. The allyl alcohol purity of >99.9% could be achieved by using 35% K2CO3 + 25% K2HPO4. The results also provide valuable references to obtain high-purity allyl alcohol for all the glycerol to allyl alcohol routes, because it is indispensable to separate allyl alcohol from its aqueous solution.
研究领域:
化学工程
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2015
·
IF 0.564
Jing Jing Shi,En Long Yang
The present study reports green electrospinning of polyvinyl alcohol (PVA) / citric acid nanofiber membranes, and the membranes were then crosslinked by heat treatment. The electric conductivity of the PVA aqueous solution increases rapidly and the growth slows down along with the increase of citric acid content. The viscosity of 13 wt% PVA aqueous solutions with citric acid had a small increase and remained stable in one week, which was suitable for electrospinning fibers. Porous, interconnected nonwoven nanofiber membranes were electrospun from a thoroughly mixing of PVA/ citric acid aqueous solution. The membranes were then heat treated at 140 °C for 2 h. The postelectrospinning crosslinked nanofiber membranes were insoluble in water, while the non-crosslinked electrospun nanofiber membranes dissolved instantaneously. FT-IR spectrum, X-ray diffraction, and DSC thermograms reveal that crosslinking of PVA nanofiber membranes occurred through esterfication reaction during heat treatment.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Jiang Haiyan,Zhao Qiuxiang,Zeng Ying
In this study, modified polyvinyl alcohol (PVA) was prepared and characterized by element analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and surface area and proximity analysis. The isotherms and thermodynamic parameters of the modified PVA adsorption process were estimated. The data indicate that the adsorption process is exothermic, feasible, spontaneous, and fit to the Langmuir isotherm model. The maximum adsorption capacities for Cd(II) and Pb(II) were calculated to be 1.19 and 1.48 mmol/g, respectively. Sorption was rapid, with the removal percentage higher than 98% after 10 min. Adsorption behavior mechanisms were analyzed using pseudo-first-order and pseudo-second-order models, which were highly fitted to pseudo-second-order model. This suggests the main adsorption mechanism is a chemical adsorption, involving ion exchange and valence forces through sharing or exchange of electrons between metal ions and modified PVA. The modified PVA is a good reusable sorbent, enhancing the economics of practical application for the removal of Cd(II) and Pb(II) from water and wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）