Food Structure-Netherlands
·
2022
·
IF 4.551
Nan Chen,Hao-Xiang Gao,Qiang He,Zhi-Long Yu,Wei-Cai Zeng
The influence of structure complexity of phenolic compounds on their binding with maize starch was investigated. The computational results (including molecular electrostatic potential and molecular dynamics simulation) indicated that protocatechuic acid, ellagic acid , naringin and tannic acid could bind with maize starch by hydrogen bonds, while the number and distribution of hydroxyl groups in phenolic compounds significantly affected the binding affinity and combination conformation. Furthermore, the microstructure, particle size, crystallinity and thermal stability of maize starch were both changed obviously through the binding with phenolic compounds, and the binding effect was more obvious induced by phenolic compounds with larger molecular size and bigger steric hindrance. All present results suggested that the amount of hydroxyl groups, molecular size and steric hindrance of phenolic compounds could affect their binding effects on starch molecules, so as to modify the structure and properties of maize starch in different degrees.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Umar Adli Amran,Sarani Zakaria,Chin Hua Chia,Zhen Fang,Mohamad Zulfahdli Masli
Optimization of microwave-assisted liquefaction of oil palm empty fruit bunch fiber (EFB) and cellulose (EFBC) in ethylene glycol (EG) was carried out to produce polyols. The liquefaction residues and hydroxyl numbers of the resultant polyols from respective sources were studied and compared. EFB produced a minimum residue of 3.22% at the optimal parameters of 160 °C and 15 min. Meanwhile, optimum liquefaction of EFBC produced 1.03% residue at 175 °C and 40 min. The maximum hydroxyl numbers of both EFB (749.22 mg KOH/g) and EFBC (639.91 mg KOH/g) polyols were obtained at optimum conditions. FTIR analysis revealed the degradation mechanism of cellulose and lignin in EFB at different temperatures. Lignin was found to be liquefied easily at lower temperatures (130 and 145 °C). However, most of the cellulose began to be liquefied at the optimum temperature (160 °C) and severely degraded at higher temperatures (175 and 190 °C).
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Hedi Wen,Deju Zhang,Zhenzhen Ning,Zihao Li,Yan Zhang,Jingbo Liu,Ting Zhang
In order to explore the effect of polyphenol structure on the foaming properties of protein, the ovalbumin-polyphenol (OVA-polyphenol) complexes were developed by combining OVA with gallic acid (GA), 3,4-dihydroxybenzoic acid (DA), P-hydroxybenzoic acid (PA), 4-coumaric acid (CA), trans -3-hydroxycinnamic acid (T3A) and trans -2-hydroxycinnamic acid (T2A), respectively, and then the foaming properties, binding interactions, physicochemical properties and protein structure of complexes were determined. Results showed that the foaming ability (FA) and surface hydrophobicity were in the order of OVA-PA > OVA-T2A > OVA-DA > OVA-CA > OVA-T3A > OVA-GA > OVA, whereas the α-helix, fluorescence quenching ability and ζ-potential of OVA-polyphenol complexes followed an opposite trend, suggesting that fewer hydroxyl groups and ortho-aromatic structures were positively associated with higher foaming properties of the complexes. Physicochemical properties revealed that OVA-polyphenol complexes obtained higher ζ-potential and surface hydrophobicity, revealing that the addition of polyphenol promoted the adsorption and rearrangement of OVA in liquid-gas interface and increased its foaming properties. Molecular interactions demonstrated that PA, due to their fewer hydroxyl binding sites, and T2A, due to the existence of competitive binding, led to the instability of OVA-polyphenol complexes, promoting the movement of OVA and the exposure of its hydrophobic groups, thus contributing to the conversion of α-helix to the random coil conformations and ultimately promoting the FA of the complexes. In conclusion, polyphenols could increase the foaming properties of OVA, and PA retained the highest priority due to its excellent overall performance. These findings will be of interest for developing foods with improved functional properties.
研究领域:
食品科学
·
生物化学
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产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·4211-4222
·
IF 5.044
Lin Yamei,Li Mei,Xia Jianling,Ding Haiyang,Xu Lina,Yang Xiaohua,Li Shouhai
Abstract Polyols with different number of hydroxyl groups were synthesized from ricinoleic acid and oleic acid. These plant oil derived polyols can be used as plasticizers and combined with ethyl cellulose (EC) through supramolecular system to prepare ethyl cellulose composite films. The morphology, thermal stability and mechanical properties of the prepared ethyl cellulose films were studied in detail to indicate the plasticizing efficiency of these polyols and the effect of the number of hydroxyl groups in polyols on EC composite film’s properties. With the addition of polyols, the tensile strength of EC composite films decreased, while the elongation at break increased. The elongation at break of EC composite films can be improved by 11–12 times when the polyols contain 1–3 hydroxyl groups. Thus, the plant oil derived polyols with 1–3 hydroxyl groups can be used as plasticizers for EC films. In addition, molecular dynamic simulations were performed to further probe the effects of the number of hydroxyl groups in polyols on EC composite film’s properties. Graphic abstract
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yufan Mo,Chunli Li,Huiyu Li,Luis Alberto Estudillo-Wong,Luming Wu,Yinbin Wang,Haibin Yu,Dianqing Li,Yongjun Feng
Porous spherical γ-alumina supports play the key role in the petroleum reforming industry with strict requirement in hydrothermal stability of pore structure. Here, a series of pseudo-boehmite samples with different crystal orientations were synthesized in a separate nucleation and aging steps method by adjusting the rotating speed. The pseudo-boehmite (PB-1000) at 1000 rpm yields a high (0 2 0) plane proportion of 44.52 %, which is comparable with that of 43.91 % for the Sasol Boehmite (SB) powder. The Al 2 O 3 -1000 from the PB-1000 demonstrated the highest content of γ-Al 2 O 3 phase, the lowest surface hydroxyl number of 1.56/nm 2 , and the highest hydrothermal stability with the retention rate of 75.0 % (174 m 2 ·g −1 ) at 600 °C under water vapor for 120 h, which is comparable to that of 72.3 % (191 m 2 ·g −1 ) for the Sasol sample. It is the first time to investigate hydrothermal stability of alumina from the content of γ-Al 2 O 3 phase and the surface hydroxyl groups.
研究领域:
材料科学
·
石油化工
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhengdong Ouyang,Xiaofeng Li,Jie Zhang,Bo Li,Honghan Long,Yingdan Zhang,Kaifu Yu,Yang Li,Lijian Ma
Exfoliating Covalent Organic Frameworks (COFs) into few-layer or even monolayer nanosheets not only improves the exposure of active sites and facilitates mass transfer efficiency, but also enhances their solubility or dispersion to achieve solution processability. As the Coulomb repulsion can weaken the stacking interactions, the construction of ionic COFs shows promising prospects for obtaining self-stripping nanosheets, but precisely controlling the self-exfoliated degree remains a challenge. Herein, we found for the first time that varying the number of hydroxyl groups in the building blocks could significantly affect the self-exfoliated degree for ionic COFs, and thus successfully produced a series of ionic COFs with stepwise solubility differences. Interestingly, the trend of self-exfoliated degree and solubility of cationic (EBCOFs) and anionic COFs (SDCOFs) were completely opposite to each other. Mechanistic studies indicated that more hydroxyl groups as electron donating groups increased the electron density of ionic COFs, resulting in a decrease in the Coulomb repulsion of cationic COFs (EBCOFs) but an increase in the Coulomb repulsion of anionic COFs (SDCOFs). Furthermore, in order to achieve the efficient co-removal of anionic and cationic radionuclides, we assembled cationic and anionic COF nanosheets through electrostatic attraction to obtain a novel zwitterionic COF (EB@SD COF) with both anion and cation adsorption sites. Impressively, EB@SD COF demonstrated rapid and efficient co-adsorption of ReO 4 - (a substitute for TcO 4 - ) and Sr 2+ with the maximum adsorption capacities of 117.6 and 122.4 mg/g, respectively. This work not only developed an effective zwitterionic COF adsorbent for the co-removal of radionuclides but also broadened the horizon of preparation methods for self-exfoliated ionic COFs.
研究领域:
材料科学
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环境科学
·
核化学与放射化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yutong Ye,Jinhao Zhang,Panpan Chen,Yongli Ji,Chunyan Ma,Jun Guo,Yi Liu,Hongli Chen
We investigated the mechanism by which the number of phenolic hydroxyl groups in flavonoids regulates their interactions with β-lactoglobulin in food systems. Kaempferol, quercetin, and myricetin were selected as model flavonoids with increasing number of hydroxyl groups. Spectroscopy revealed that increasing the hydroxyl content enhanced protein fluorescence quenching, promoted β-sheet formation, and induced a more compact protein conformation (39.7–42.6 %). Thermodynamic results demonstrated that hydrogen bonding dominated the binding process and that the binding affinity increased with hydroxyl number (binding constant: 9.55 to 36.31 × 10 6 L·mol −1 ). Kinetic analysis showed that a higher hydroxyl content reduced the activation energy (from 40.9 to 25.4 kJ·mol −1 ), allowing flavonoid–protein binding to be completed within 5 s. Flavonoid-induced protein compaction improved the emulsion stability and antioxidant performance, depending on hydroxyl number. These findings reveal a structure–interaction–function relationship and provide guidance for designing flavonoid–protein delivery systems in food applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）