INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hui Zhang,Song Xu,Xinyu Zhang,Mengting Ma,Zhongquan Sui,Harold Corke
The multi-scale structure changes of five underutilized starches, including waxy proso millet (PMS) and amaranth (AS) starches, non-waxy foxtail millet (FMS), buckwheat (BS) and oat (OS) starches, were investigated after modification with acetic anhydride (0.0165 mol) and vinyl acetate (0.0165 mol). Five starches exhibited a higher proportion of short chains compared to waxy and normal maize starches. Degree of substitution (DS) of acetylated starches ranged 0.03 to 0.08. Vinyl acetate modified non-waxy starches showed higher DS values than waxy starches, while acetic anhydride modified waxy starches exhibited higher DS values than non-waxy starches. Vinyl acetate reduced relative crystallinity (RC) by 1.3 % in PMS, 5.7 % in FMS, and 12.5 % in OS, whereas acetic anhydride did not significantly decrease RC for AS, FMS, BS and OS. For the non-waxy starches, gelatinization enthalpies after vinyl acetate modification were 4–22 % lower than after acetic anhydride modification. Additionally, the increase in amorphous lamellae thickness (da) of PMS, AS, BS and OS was greater with vinyl acetate than acetic anhydride, indicating that vinyl acetate more effectively disrupted crystalline lamellae. Overall, the presence of amylose influenced DS of modified starches. However, change of supramolecular structure was independent of DS but dependent on the acetylation reagent.
研究领域:
食品科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Fermentation-Basel
·
2023
·Vol. 9
·期 8
·756
·
IF 3.7
Peng Du,Yingqi Li,Chenrui Zhen,Jia Song,Jiayi Hou,Jia Gou,Xinyue Li,Sankuan Xie,Jingli Zhou,Yufeng Yan,Yu Zheng,Min Wang
Polyphenols are important functional substances produced in the acetic acid fermentation (AAF) of Shanxi aged vinegar (SAV). Previous studies have shown that the metabolic activity of microorganisms is closely related to polyphenol production and accumulation. In this study, microorganisms in the AAF of SAV were analyzed to explore how to increase the polyphenol yield by changing the microorganisms and reveal the potential mechanism of the microbial influence on the polyphenol yield. Macrotranscriptome analysis showed that acetic and lactic acid bacteria dominated the AAF fermentation process and initially increased and decreased. Spearman correlation analysis and verification experiments showed that the co-addition ofAcetobacter pasteurianusandLactobacillus helveticuspromoted the accumulation of polyphenols, and the total polyphenol content increased by 72% after strengthening.Keywords:Shanxi aged vinegar;polyphenols;acetic acid fermentation;microbial enhancement;Acetobacter pasteurianus
研究领域:
食品科学
·
微生物学
·
生物化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xiaohui Guo,Yingjuan Fu,Fawei Miao,Quanshui Yu,Na Liu,Fengshan Zhang
Thermal acetic acid/sodium acetate hydrolysis (ASH) on poplar wood chips were carried out to obtain functional xylooligosaccharide, then the hydrolyzed wood chips were subjected to kraft pulping (KP) to fractionate cellulose and lignin. The separated three fractions were extensively characterized for further utilization in view of the integral biorefinery concept. The extraction efficiency of hemicelluloses by ASH strongly depends on the buffer ratio of the acetic acid/sodium acetate buffer solution. The ASH facilitated producing a high ratio of xylooligosaccharides with high molecular weight, while prevented further degradation of the saccharides, and simultaneously inhibited the condensation of lignin facilitating the subsequent kraft delignification. The obtained cellulose pulps had higher intrinsic viscosities as compared with the traditional autohydrolysis-KP process. Moreover, the ASH-KP process delivered a high purity of lignin with relatively high molecular weight. Therefore, the proposed integrated fractionation strategy is conducive to convert the lignocellulosic components into bio-based functional materials.
研究领域:
林业工程
·
生物炼制
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Minhua Zhang,Jianyu Zhuang,Xingyu Wu,Yingzhe Yu
In the actual vinyl acetate production process, benzene is a very harmful by-product for the quality of the product. In this work, the experimental method and DFT method are combined to study how the by-product benzene is produced during the production of vinyl acetate by acetylene gas-phase. The catalysis of zinc acetate/activated carbon catalyst is the main reason for the formation of benzene from acetylene. Acetic acid can reduce the formation of benzene. The reaction pathway CHCH + CHCH → CHCHCHCH, CHCHCHCH + CHCH → C 6 H 6 is the most probable reaction path of acetylene to benzene. Acetylene can generate benzene through a two-step elementary reaction. The activation barrier is 0.25 eV and 0.86 eV, respectively. Acetic acid has a stronger adsorption at the active site than acetylene. The competitive adsorption of acetylene and acetic acid is an important reason why acetic acid can reduce acetylene to benzene.
研究领域:
化学工程
·
催化反应
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Heritage Science
·
2020
·Vol. 8
·期 1
·1-9
·
IF 1.902
Jia Zhihui,Li Jing,Li Yuhu,Qi Yunpeng,Hu Daodao,Xing Huiping,Chao Xiaolian
Microbubble disease observed in cellulose acetate microfilm is accompanied by the production of vinegar syndrome, which affects the image integrity. In the present study, samples of cellulose acetate microfilm with microbubble disease were selected to investigate potential treatment methods. Samples were sourced from the Republic of China (AD 1912–1949) microfilm collections held in the Second Historical Archives of China. A combination of optical microscopy and a stainless-steel needle was used to remove plasticizer exudation within microbubbles. The plasticizer was effectively removed by infiltrating butan-1-ol into the microbubble from a small hole made by the stainless-steel needle. SEM and confocal microscopy were used to study the morphology and roughness of the internal surface of the microbubbles. It was found that the blurry image could be attributed to light scattering from the rough surface. Ethyl cellulose was used to fill the interior of the microbubble to obtain a clearer image. To determine the protective potential of this filling material, the chemical and mechanical properties of coated film after dry heat, hygrothermal and UV accelerated ageing were measured. Based on the above-mentioned results, it is encouraging that a new microrepair method and its corresponding method are offered in film treatment work.
研究领域:
文物保护
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材料科学
·
化学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 13
·期 1
·113
·
IF 3.426
Zhihui Zhang,Zhengdong Zhao,Yujia Lu,Di Wang,Chengyu Wang,Jian Li
A CA-Eu(III) complex was synthesized by the coordination reaction of cellulose acetate (CA) and Eu3+to obtain a CA-Eu light conversion film. This product was then doped with Tb(III) to sensitize the luminescence of Eu3+, which could functionalize the CA film. FTIR and XPS showed that the oxygen atoms in C=O, C–O (O=C–O), and O–H were involved in the complexation with Eu3+and formed a Eu–O bond. SEM revealed that Eu3+filled in the pores of the CA film. By changing the experimental conditions, the best fluorescence performance was obtained at the CA: Eu3+ratio of 3:1 with a reaction time of 65 min. The energy transfer between Tb3+–Eu3+could be realized by doping Tb3+to enhance the luminescence of Eu3+. The best fluorescence performance of the CA-Eu-Tb light conversion film was at a Eu3+:Tb3+ratio of 3:1. Compared with the CA film, the light conversion film has high transparency, high tensile strength, and good flexibility. It can convert the ultraviolet light harmful to plants into red light that is beneficial to photosynthesis. This offers high efficiency and environmental protection in the field of agricultural films.Keywords:light conversion film;cellulose acetate;europium;sensitization
研究领域:
材料科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·539
·
IF 3.9
Yuhao Chen,Mengli Li,Zhuang Xu,Guowang Shen,Xugeng Wang,Bin Dai
In this study, novel Zn catalysts were prepared by the wet impregnation method using printing and dyeing wastewater (PDW)-modified petroleum coke (petcoke) as a carrier, and they were applied to the acetylene acetoxylation. The pretreated petroleum coke has a high specific surface area which provides sufficient space for the loading of Zn. Calcination further increases catalyst activity, but when calcination temperatures exceed 1000 °C, a significant loss of Zn occurs, resulting in a dramatic decrease in catalyst activity. This enables the conversion of acetic acid up to 85%. X-ray photoelectron spectroscopy confirmed that a large amount of N is introduced into PC from PDW, which changes the electron transfer around Zn. Temperature-programmed desorption (TPD) analysis revealed that the nitrogen-doped Zn(OAc)2catalyst enhanced the catalytic activity by modulating the intensity of the catalyzed adsorption of acetic acid and acetylene. This study provides a new way to reuse petroleum coke and printing and dyeing wastewater to support the sustainable development of the vinyl acetate industry.Keywords:wastewater;petroleum coke;vinyl acetate
研究领域:
催化化学
·
环境科学
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2025
·
IF 15.6
Jun Mao,Huan Liu,Yanan Li,Meng Gao,Yunlong Zhang,Yao Song,Mo Zhang,Guilan Xu,Wu Zhou,Liang Yu,Xiaoju Cui,Dehui Deng
The oriented conversion of CH4 to CH3COOH at low temperature, even room temperature, is both scientifically significant and industrially applicable for CH4 utilization, yet it is extremely challenging due to the difficulties associated with efficient CH4 activation and controllable C–C coupling. In this study, we for the first time achieve the room-temperature conversion of CH4 to CH3COOH using molecular O2 and CO over MoS2-confined Rh–Fe sites, which delivers an unprecedented CH3COOH selectivity of 90.3% and a productivity of 26.2 μmol gcat.–1 h–1 at 25 °C. Furthermore, the productivity of CH3COOH can be enhanced to 105.6 μmol gcat.–1 h–1 at 80 °C, while maintaining a high selectivity of 95.6%. Comprehensive experimental and theoretical investigation reveal the critical role of Rh–Fe synergy in the selective formation of CH3COOH. The confined Fe sites in MoS2 enable the activation of O2 to generate highly reactive Fe═O center for CH4 dissociation to CH3 species at room temperature, which then readily couple with adsorbed CO on adjacent Rh sites to form the key CH3CO intermediate for CH3COOH production. The unique structure of Rh–Fe sites offers synergistic catalytic properties that effectively balance C–H activation and C–C coupling, successfully addressing the trade-off between activity and selectivity in the carbonylation of CH4 to CH3COOH under mild conditions.
研究领域:
化学
·
催化反应
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qiqi Gu,Shijin Cheng,Qiaoyi Xiao,Qianchen Ou,Hongmei Wang,Yuan Lian,Liping Guo
The FeCo-LDH/Cd 1-x Zn x S nanocomposite was synthesized via an impregnation method, employing FeCo-LDH as a cocatalyst for simultaneous upcycling of polyethylene terephthalate (PET) plastics and photocatalytic hydrogen production. The 5 %LDH/Cd 0.5 Zn 0.5 S nanocomposite demonstrated an optimal hydrogen evolution rate of 3.67 mmol·g −1 ·h −1 in alkaline PET solution, which is 2.3 times higher than pristine Cd 0.5 Zn 0.5 S. Notably, the photocatalyst retained stable performance over six recycling tests without significant activity loss. Concurrently, PET oxidation by photogenerated holes yielded acetate as the primary product, achieving an 87 % yield. The real-world applicability of this approach was further validated through the successful photoreforming of a PET bottle. UV–vis DRS, TRPL, and PEC analyses revealed that the incorporation of appropriate amount of FeCo-LDH significantly enhanced charge carrier separation, thereby boosting the photocatalytic activity. Furthermore, UPS and DFT calculations elucidated the mechanistic pathway for PET conversion and hydrogen production over FeCo-LDH/Cd 0.5 Zn 0.5 S. This study presents a promising strategy for co-producing hydrogen and value-added chemicals from PET waste, highlighting its potential for practical recycling applications.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Xiao Du,Tengfei Li,Lumei Wang,Dezhang Ren,Wenhui He,Zhibao Huo
In this paper, an alkali-free route for the conversion of chitin and shrimp shell to acetic acid (AA) using aluminum salts in aqueous media was reported for the first time. The proposed method demonstrated several advantages, including simplicity, effectiveness, and superior environmental and economic benefits compared to previous approaches. Notably, it achieved a significant breakthrough in the yields of AA derived from chitin and shrimp shells. Under the optimal conditions, the yield of AA reached the maximum value of 81.4 %. Combined with theoretical calculation and characterization, a possible transformation mechanism was proposed, and it was proved that the presence of aluminum salts would change the main reaction pathway and participate in the preparation of AA in the form of polymers. This study provided a novel idea for the resource utilization of chitin and waste shell materials into valuable chemicals and also for the treatment of environmental pollution.
研究领域:
生物化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 18
·4026
·
IF 3.057
Shasha Zhang,Wenxin Ji,Ning Feng,Liping Lan,Yuanyuan Li,Yulong Ma
In this study, a Rh(I)/Ru(III) catalyst with a bimetallic space structure was designed and synthesized. The interaction between the metals of the bimetallic catalyst and the structure of the bridged dimer can effectively reduce the steric hindrance effect and help speed up the reaction rate while ensuring the stability of the catalyst. X-ray photoelectron spectroscopy (XPS) results show that rhodium accepts electrons from chlorine, thereby increasing the electron-rich nature of rhodium and improving the catalytic activity. This promotes the nucleophilic reaction of the catalyst with methyl iodide and reduces the reaction energy barrier. The methanol carbonylation performance of the Rh/Ru catalyst was evaluated, and the results show that the conversion rate of methyl acetate and the yield of acetic acid are 96.0% under certain conditions. Furthermore, during the catalysis, no precipitate is formed and the amount of water is greatly reduced. It can be seen that the catalyst has good stability and activity.Keywords:carbonylation;acetic acid;bimetallic catalyst
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Membranes
·
2025
·Vol. 15
·期 5
·129
·
IF 3.6
Shichang Xu,Long Zhang,Zhen Zhang,Lixin Xie,Wen Zhang
In this study, the integrated process of reverse osmosis (RO) and electrodialysis (ED) is developed to concentrate the dilute solution of acetic acid (HAc). The key parameters, such as RO pressure, ED voltage, and ED volume ratio, were systematically evaluated and the operation conditions of the processes were optimized. Under an operating pressure of 5 MPa, RO can enrich low-concentration HAc from 1.5 wt.% to 6.5% wt.% and the energy consumption is 0.37 kW·h·kg−1. Next, RO-concentrated water was used as the ED feed and the first ED with a volume ratio of the concentrated to dilute chamber of 1:4 was carried out under the conditions of a flow rate of 30 L/h and an operating voltage of 12 V; the HAc concentration reached 12.50 wt.%. The second ED with a volume ratio of 1:5 made the final HAc concentration reach 19.02 wt.%. This study shows that using RO-concentrated water instead of initial water for the ED process can reduce water energy consumption and cost markedly, and the RO–ED integrated process can efficiently pre-enrich low-concentration HAc aqueous solution, and the enriched HAc concentration meets the requirements for the further distillation of HAc.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）