INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Yu Long,Cuiyi Liang,Yang Chen,Qiong Wang,Wen Wang,Yunzi Hu,Usama Shakeel,Baiquan Zeng,Wei Qi
In this work, the combined pretreatment of sulfuric acid and alkaline (SA), solid acid and organic solvent (SO) and phosphoric acid and peroxide (PHP) on poplar was used to thoroughly evaluate the effects of wet and dry processing on enzymatic digestibility . The finding showed a negative connection between increasing glucose yield and rising drying temperature. Moreover, research showed that wet processing is beneficial because it improve mass transfer and permeability for enzymatic liquefaction . Enzymatic hydrolysis was additionally increased by mechanical wet milling following combined pretreatment. Most importantly, SO pretreatment was superior to PHP because SO pretreatment had a stronger linear relationship between particle size and glucose yield. Wet-milled post-treatment followed by SO combined pretreatment produced an acceptable glucose yield (91.93%). In comparison to the untreated poplar, the glucose yield had an increase by 87.14%. This work offers a novel processing method that might serve as a theoretical sound foundation for the effective saccharification of poplar wood.
研究领域:
生物化学
·
可再生资源工程
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产品关联
DOI
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Liang Deng,Xuan Huang,Haicai Lv,Yichuan Zhang,Guangming Chen
Processing protocols definitely impact polymer microstructure evolution and thermoelectric (TE) performance; however, in-depth understanding of molecular mechanism is still a challenge. Here, the mechanism of the effects of solution- and melt-processing protocols on polymer microstructure evolution and TE performance has been unraveled, where a semicrystalline poly(3-hexylthiophene) (P3HT) is chosen as a model system. The phase separations between crystallites and amorphous regions are more pronounced for melt-processed films, and solution-processed films display enlarged conjugation length and higher degree of solid-state ordering. In crystalline domains, solution-processed films reveal a completely edge-on structure, while melt-processed exhibit a co-existing of edge-on and face-on crystallites. Additionally, solution-aging strengthens aggregation and phase separation, but has little effect on conjugation length and crystalline texture. Finally, a multiphase semicrystalline model, based on crystalline texture and phase separation, is applied.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 16
·3462
·
IF 5
Yajie Wang,Chaoyue Zhao,Ziqi Cai,Lihong Wang,Liangxiang Zhu,Hui Huang,Guoping Zhang,Peng You,Chen Xie,Yaping Wang,Qing Bai,Tao Yang,Shunpu Li,Guangye Zhang
Organic solar cells (OSCs) have gained increasing attention. Among the various directions in OSCs, all-polymer solar cells (all-PSCs) have emerged as a highly promising and currently active research area due to their excellent film formation properties, mechanical properties, and thermal stabilities. However, most of the high-efficiency all-PSCs are processed from chloroform with an active layer thickness of ~100 nm. In order to meet the requirements for industrialization, a thicker active layer processed from low-vapor pressure solvents (preferentially a hydrocarbon solvent) is strongly desired. Herein, we employ toluene (a hydrocarbon solvent with a much higher boiling point than chloroform) and a method known as sequential processing (SqP) to mitigate the rapid decline in efficiency with increasing film thickness. We show that SqP enables a more favorable vertical phase segregation that leads to less trap-assisted recombination and enhanced charge extraction and lifetime than blend-cast devices at higher film thicknesses.Keywords:all-polymer solar cells;sequential processing;hydrocarbon solvent processing;thick-film active layer
研究领域:
材料科学
·
能源技术
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2020
·Vol. 107
·期 1
·73-83
·
IF 2.633
Su Guosheng,Xiao Xiaodong,Du Jin,Zhang Jingjie,Zhang Peirong,Liu Zhanqiang,Xu Chonghai
Since Dr. Carl Salomon proposed the well-known hypothesis on cutting temperatures in 1931, the debate on the hypothesis has never stopped. It shows that evolutions of temperatures with the increase of cutting speed measured at different points are different. From the tool wear and surface integrity point of view, this paper focuses on the evolutions of chip temperature (Chip temp.), tool-chip contact temperature (T-C temp.), and tool-workpiece contact temperature (T-W temp.) with the increase of cutting speed from low (100 m/min) to very high (7000 m/min). First, the cutting heat generation and the temperature increment in machining are theoretically analyzed. Then the influences of chip shape and mechanical property variations with the increase of cutting speed on the temperatures are analyzed. Finally, the cutting temperatures are semiquantitatively derived from chip colors and other heat characteristics in the chip and cutting tool obtained in cutting experiments: evolutions of Chip temp., T-C temp., and T-W temp. with the increase of cutting speed are presented based on the experiment results. The influence of chip shape and temperature variation on tool wear are also discussed.
研究领域:
机械工程
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制造工艺
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材料加工
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热力学
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表面工程
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DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 5
·803
·
IF 3.164
Feng Bao,Fengfeng Zhang,Chenghao Wang,Yuanyuan Song,Nan Li,Jinyan Wang,Xigao Jian
The application of poly(phthalazinone ether ketone)s (PPEKs) resin containing phthalazinone moiety is limited, due to its poor thermoforming processability. To investigate the effects of the phthalazinone’s side-group on the thermal stability and processability of the resin, a series of PPEKs resins with different side-group (–H/–CH3/–Ph) were prepared by nucleophilic aromatic substitution polymerization. The properties of the obtained resins were investigated by differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), dynamic thermomechanical analysis (DMA), and rheogoniometer. The results show that the introduction of methyl or phenyl into the PPEKs resin, significantly reduced the melting viscosity of the resin, but resulted in a slight decrease in the thermal stability of it. This might be due to the presence of methyl or phenyl, which enhanced the free volume of the molecule and reduced the entanglement between the chains; the results of the computer simulation confirmed it. Moreover, the resin films displayed excellent tensile strength with the introduction of methyl or phenyl. In a word, a novel poly(phthalazinone ether ketone)s resin with thermal resistance, easy processing and excellent mechanical properties could be obtained by introducing appropriate bulk-rigid side-groups into the phthalazinone moiety.Keywords:phthalazinone;side-group;thermal properties;processability
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 94
·期 4
·1220-1229
·
IF 2.587
Weide Xiong,Xianhai Zeng,Shih-Hsin Ho,Xueping Ling,Liang Shen,Chuanyi Yao,Yinghua Lu
BACKGROUND Phospholipase D (PLD) has great potential in the pharmaceutical and food industries for manufacturing bioactive phospholipids. Overproduction of PLD in Escherichia coli is difficult due to its high cytotoxicity which causes plasmid instability, short-term PLD synthesis, cell lysis and PLD leakage. To address this issue, integrated optimization of PLD production in upstream and downstream processing was performed. RESULTS Effective strategies in upstream processing include the use of plasmids containing the pSC101 par region in recA − E. coli , the use of moderately strong and tightly regulated promoter P BAD , optimization of codon usage and amino acid supplementation, maintaining the best cellular state by supplementing nutrition, and saturation induction at low temperature. Using these strategies, a large amount of PLD (1.2 × 10 5 U L −1 , 81.5 mg L −1 ) was obtained in the batch culture and PLD synthesis lasted 9 h. Additionally, cell lysis did not occur –99% of the recombinant PLD remained in the periplasm. Ultimately, the PLD was purified 327-fold by a four-step downstream process comprising extraction with 10 mmol L −1 Ethylenediaminetetraacetic acid and 0.05% (w/v) sodium deoxycholate, ammonium sulfate precipitation, anion exchange and Ni 2+ -affinity chromatography. CONCLUSION This study provides the basis for large-scale production of PLD in E. coli . © 2018 Society of Chemical Industry
研究领域:
生物技术
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微生物学
·
制药业
·
食品工业
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DOI
高影响因子
Journal of Pharmaceutical Analysis
·
2017
·
IF 0
Min Liu,Yan Cao,Diya Lv,Wen Zhang,Zhenyu Zhu,Hai Zhang,Yifeng Chai
According to the Chinese Pharmacopoeia 2015, only processed Aconitum tubers can be clinically applied, and the effect of processing is unclear. This research aimed to explore the effect of processing on cardiac efficacy of alkaloids in Aconitum tubers. First, the chemical ingredients in unprocessed and processed Aconitum tubers were identified and compared by using high performance liquid chromatography time-of-flight mass spectrometry (HPLC-TOF/MS) and multivariate pattern recognition methods. Then the representative alkaloids in Aconitum tubers, aconitine, benzoylaconine, and aconine, which belong to diester-diterpenoid alkaloids, monoester-diterpenoid alkaloids, and amine-diterpenoid alkaloids, respectively, were selected for further validation of attenuated mechanism. Subsequent pharmacological experiments with aconitine, benzoylaconine, and aconine in SD rats were used for validate the effect of processing on cardiac functions. After processing the Aconitum tubers, it was found that the contents of diester-diterpenoid alkaloids were reduced, and those of monoester-diterpenoid alkaloids and amine-diterpenoid alkaloids were increased, suggesting that diester-diterpenoid alkaloids were transformed into monoester-diterpenoid alkaloids and amine-diterpenoid alkaloids. Through further decocting the aconitine in boiling water, it was confirmed that the three alkaloids could be progressively transformed. Pharmacological experiments with aconitine, benzoylaconine, and aconine in SD rats showed that aconitine at a dose of 0.01 mg/kg and aconine at a dose of 10 mg/kg enhanced the cardiac function, while benzoylaconine at a dose of 2 mg/kg weakened the cardiac function. The effect of processing is attributed to the transformation of the most toxic diester-diterpenoid alkaloids into less toxic monoester-diterpenoid alkaloids and amine-diterpenoid alkaloids.
研究领域:
中药学
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药理学
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DOI
PubMed
MACROMOLECULAR RESEARCH
·
2021
·Vol. 29
·期 8
·562-568
·
IF 2.227
Wei Zhengkai,Wang Yi,Fu Xiaowei,Jiang Liang,Wang Yuechuan,Yuan Anqian,Xu Hualiang,Lei Jingxin
The thermosetting polyurea possessed high tensile strength and elongations at break due to strong intermolecular interactions, but their recycling and reprocessing remains a great challenge, especially at a temperature below 100 °C. Herein, the novel crosslinked polyurea with excellent recycling and reprocessing properties has been prepared by introducing the Diels-Alder dynamic covalent bond. The chemical structure, thermal mechanical properties and reprocessing performance of the crosslinked polyurea were investigated. The prepared polyurea has low relaxation time of ∼4 min at 80 °C for facile reprocessing. The tensile strength and elongation at break of crosslinked polyurea could reach 15.24 MPa and 529.2%, respectively, and its mechanical properties remain almost unchanged even after repeated processing. This work has realized the recycling of crosslinked polyurea, which has huge potential applications in environmental protection and recycling of waste plastics.
研究领域:
材料科学
·
聚合物化学
·
环境科学
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DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2025
·
IF 3.1
Baojie Zhu,Cunwu Chen,Jiaxian He,Shaoping Li,Jing Zhao
The interpretation of the chemical quality differences during Dendrobium huoshanense ( D. huoshanense ) traditional processing into ‘Fengdou’ is critical for scientifically evaluating the medicinal value, optimizing the processing methods, and ensuring the stability and predictability of its efficacy. In this study, the quality differences of polysaccharides during the processing of D. huoshanense were conducted utilizing high performance size exclusion chromatography coupled with multi-angle laser light scattering and refractive index detector (HPSEC-MALLS-RID), nuclear magnetic resonance (NMR) and saccharide mapping based on polysaccharides analysis by using carbohydrate gel electrophoresis (PACE) and high-performance anion exchange chromatography-pulsed amperometric detection (HPAEC-PAD). The results showed that the concentration of non-starch D. huoshanense polysaccharides (NDHP) rose and exhibited greater stability during the processing. The molecular weight (Mw), molecular weight distribution, cumulative molar mass, radius of gyration (Rz), and monosaccharide composition molar ratio of NDHP did not have significant changes during the processing, and these parameters would be affected by the presence of starch. The NMR investigation indicated that the primary glycosidic linkages of β -1,4-Man p and β -1,4-Glc p , together with the acetyl group substitutions at O-2 and O-3 of 1,4-linked Man p , were unaltered. Additionally, the PACE and HPAEC-PAD profiles of acidic and enzymatic hydrolysates of NDHP were similar. These findings contribute to a deeper understanding of the changes in bioactive polysaccharides during the processing of D. huoshanense into ‘Fengdou’, providing theoretical support for improving its processing techniques.
研究领域:
中药学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 1
·49640
·
IF 2.52
Chunyan Qu,Yao Tang,Dezhi Wang,XuPeng Fan,Hongfeng Li,Changwei Liu,Kai Su,Daoxiang Zhao,Jiaqi Jing,Xiao Zhang
Limitations in the properties of polyamide PA66, such as low glass transition temperature and high water absorptivity, limit its applications. Introduction of amorphous polyimide segments into the PA66 main chain lowers the glass transition temperature and melting temperature and also improves its processability. PA66-polyimide (PA-PI) copolymers with different weight ratios of PI are prepared by high temperature and high-pressure solution polymerization. The degree of crystallization of PA-PI copolymers decreases with increasing PI content. The melting point decreases from 261°C for PA66 to 223°C for PA-PI-4. Dynamic mechanical analysis shows that the T g increases from 70 to 90°C, and the storage modulus can be well maintained. Rheological studies show that the temperature for processing can reach 70°C. Copolymers with different PI contents show different processing viscosities. In addition, water absorptivity (about 1.8%) and dielectric constant values of PA-PI and PA6/6T are similar.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2018
·Vol. 8
·期 9
·1481
·
IF 1.689
Yao Ren,Haoyu Xie,Li Liu,Dongying Jia,Kai Yao,Yuanlong Chi
β-glucan extract (GE) was obtained from highland barley bran using alkaline–acid–alcohol extraction method. The stability, solubility, foaming ability, and prebiotics characteristics of GE were assessed consecutively. GE demonstrated excellent heat stability (hardly degraded at 220 °C) and pH stability, especially at neutral or alkaline condition, and its solubility was significantly influenced by temperature instead of pH or NaCl, achieving 0.91 g/100 g at 100 °C. Good foaming ability and foam stability of GE were observed during low temperatures (≤40 °C), neutral or alkaline condition. GE indicated a strong anti-digestibility capacity of resisting the hydrolysis of α-amylase and simulated human gastric acid. Interestingly, GE could effectively promote the growth ofLactobacillus bulgaricusandBifidobacterium adolescentis, which was close to fructooligosaccharide. The results of this study could offer valuable information for the application of β-glucan from highland barley as prebiotics in promoting human intestinal health metabolism.Keywords:β-glucan;highland barley;processing characteristics;prebiotics
研究领域:
食品科学
·
营养学
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产品关联
DOI
高影响因子
Food Bioscience
·
2022
·
IF 5.318
Diaodiao Yang,Zhiyong He,Zhaojun Wang,Qin Fang,Fatih Oz,Jie Chen,Maomao Zeng
Heterocyclic amines (HAs) could be generated though sausage processing. The results showed that garlic, black pepper, chili inhibited the formation of HAs (584.29 ng/g, 613.11 ng/g, 677.23 ng/g) whereas ginger and Sichuan pepper intensified (965.66 ng/g, 916.59 ng/g) compare with control sausage 863.86 ng/g. Furthermore, the study showed that garlic, black pepper, chilli all inhibited the formation of total HAs at stage of raw, drying, baking and steaming and had different inhibitory effect at every stage. Black pepper had the best inhibitory effect across four stages and inhibition rate reached 65%, 69%, 66%, 84% after each stage. Chilli was the only one had inhibitory effect on both free and protein-bound HAs at every stage and inhibition rate about free and protein-bound HAs reached 38% and 76% in finished sausage. Adding certain spices properly during processing would be helpful to obtain fewer HAs in sausage.
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
危险品化学品经营许可证（带存储）