CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Hao Wu,Xiaoxiao Li,Hangyan Ji,Birte Svensson,Yuxiang Bai
High substrate viscosity during the production process suppressed the formation of gamma-cyclodextrin (γ-CD) from starch . Although liquefaction can be carried out by enzymes with high temperature optimum, some CGTases of interest are not suitable due to loss of activity at the gelatinization temperature. In order to apply a gamma-cyclodextrin glucosyltransferase (γ-CGTase) with an optimum temperature of 50 °C to the liquefaction of 10% w/v cassava starch, an improved process combining moderate heat treatment (30 °C increased to 70 °C) with enzymatic treatment was established. The substrate viscosity dropped from 2456 to 23 cP after the pretreatment, and the rate of γ-CD production increased from 10.43 to 26.34%. This process was further applied to the liquefaction of 30% w/v cassava starch, and the pretreated substrate was finally converted into 21.81% γ-CD. In general, evaluation indicators and basic principles of starch pretreatment were established, providing a reference for the production of γ-CD.
研究领域:
生物化学
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食品科学
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xingmei Tang,Wenhua Gao,Sheng Duan,Jun Xu,Bin Wang,Jinsong Zeng
Activated carbon is a porous material extensively utilized in water treatment field . In this study, an efficient activated carbon (E-AC) adsorbent was prepared from agricultural by-product Camellia oleifera shells (COS) by enzymatic pretreatment combined with phosphoric acid activation. The enzymatic pretreatment was beneficial for increasing the volume of mesopores and loosening the structure of the synthesized activated carbon, which ultimately led to an increased adsorption capacity of E-AC. The characteristics and adsorption performances of E-AC were thoroughly investigated. The results showed that E-AC exhibited a high adsorption capacity of 1249.01 mg/g on methylene blue (MB), and the adsorption process was a spontaneous endothermic process. The adsorption kinetics aligned closely with the pseudo-second-order kinetic model (R 2 > 0.99), and the adsorption mechanisms could be a combination of hydrogen bonding, π-π conjugation, electrostatic attraction, and physical adsorption. Additionally, E-AC exhibited good reusability, with a consistent MB removal rate of 91.14 % even after five cycles. This study offered an approach for obtaining high-quality activated carbon from COS and contributed to sustainable development strategies.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Advanced Membranes
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2021
·
IF 0
Lulu Liu,Hao Zhang,Xiangrong Chen,Yinhua Wan,Jianquan Luo
Ubiquitous membrane fouling is a knotty problem in membrane-based sugar-making process, which limits productivity and sugar quality. Especially during decolorization of sugarcane juice by nanofiltration (NF), fouling mechanism is still obscure and the fouling formation is difficult to control effectively. Herein, based on the analysis of the real fouling layer residue, seven components are served as model solutes and foulants to study their NF separation performance and fouling behavior. We found that the coexistence of polysaccharides and proteins had no synergistic enhancement on membrane fouling, yet attenuated fouling layer because the formation of large complex produced more shear-enhanced back diffusion. Chlorogenic acid (CA), as a phenolic pigment and main pore foulant, aggravates the polysaccharides or proteins fouling owing to its bridging effect between membrane and large foulants, especially polysaccharides with high hydrophilicity. Laccase can catalyze oxidation and self-polymerization of CA, not only reducing its accessibility to block the pores and the bridging effect, but also in-situ forming a hydrophilic coating layer on the membrane surface, which is regarded as an effective pretreatment strategy for fouling control. During the cross-flow filtration of real sugarcane juice, the average permeate flux increases by 67.1% and irreversible fouling decreases by 21.2%, showing great application potential due to its biocompatibility and considerable economic benefits. This work not only elaborately elucidates the fouling mechanism among components in cane juice decolorization by NF, but also proposes an innovative approach to reconstitute fouling layer for improving membrane antifouling performance in practical application.
研究领域:
食品科学
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膜分离技术
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糖业加工
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生物工程
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DOI
CELLULOSE
·
2018
·Vol. 25
·期 12
·7065-7078
·
IF 3.809
Liu Xiuyu,Jiang Yan,Qin Chengrong,Yang Shuang,Song Xueping,Wang Shuangfei,Li Kecheng
Abstract Bagasse fibers are smaller and have more hemicellulose than softwood fibers, which is expected to require less mechanical energy in cellulose nanofiber production as small size and hemicellulose benefit the disintegration of fibrils during a mechanical process. Both bagasse fibers and softwood fibers were used in this investigation for producing nanofibers with enzyme pretreatment followed by mechanical grinding. Results showed that nanofibers from bagasse had more uniform diameters about 9 nm, and the films made from them were more transparent. Grinding energy consumption of bagasse fibers was significantly lower than softwood, by 7.31%, and enzyme pretreatment further improved the energy efficiency, by 59.71%, and the yield of nanofibers, by 30.57%. The mechanical strength and thermal stability of nanofiber films from bagasse fibers were similar with that from softwood fibers. The results support the idea that bagasse, a waste or byproduct from sugar industry can be a promising alternative for nanofiber production.
Graphical abstract
研究领域:
生物材料学
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纳米科技
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制浆造纸工程
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可再生资源利用
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食品与农业废弃物处理
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DOI
高影响因子
Biofuels Bioproducts & Biorefining-Biofpr
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2024
·
IF 3.2
Yue Ouyang,Ying Liu,Longjin Tian,Yongyu Ding,Guozhi Fan,Cheng Pan,Qunpeng Cheng
Anaerobic digestion is a promising technology for the treatment of food waste (FW) but it requires optimization to improve its performance. This study investigated whether combining the addition of biochar with lipase pretreatment could improve the anaerobic digestion of FW. The results showed that biochar stimulated the release of soluble substances, resulting in an increase in the methane yield of groups with added biochar by 16.24% to 19.36% in comparison with the group without biochar. Lipase pretreatment substantially shortened the fermentation time required to complete the anaerobic digestion, from 15 to 9 days. Lipase pretreatment further improved microbial abundance and promoted the enrichment of functional microbes in the anaerobic digestion of FW mediated by biochar. It also changed the methane production pathway from acetotrophic to hydrogenotrophic, thereby ensuring the stability of the anaerobic digestion system in the presence of a high ammonia nitrogen concentration.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Peng Tao,Yuehua Zhang,Zhengmei Wu,Xiaoping Liao,Shuangxi Nie
In this work, cellulase, low-concentration cold alkali and cellulase combined with cold alkali were used to pretreat unbleached bagasse pulp from which cellulose nanofibrils (CNFs), about 30 nm in diameter, were successfully prepared through ultrafine grinding and high-pressure homogenization. X-ray diffraction analysis showed that cellulase pretreatment increased the crystallinity of CNFs. After low-concentration cold alkali pretreatment, the crystallinity of CNFs significantly reduced and the crystal structure of the cellulose changed from type I to type II. Thermogravimetric analysis showed that CNFs prepared by cellulase combined with cold alkali treatment produced more regenerated cellulose and had lower thermal stability. The use of cellulase and low-concentration cold alkali pretreatments combined with ultrafine grinding and high-pressure homogenization is an environment-friendly method for preparing CNFs. The use of low-concentration cold alkali reduces the consumption of alkali and clean water.
研究领域:
生物技术
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Peng Cheng,Tuhua Zhong,Xuan Liu,Hong Chen
The development of bamboo self-bonding composites (BSBC) has gained growing momentum due to its formaldehyde-free nature and environmental friendliness. However, the inferior mechanical properties and poor water resistance of BSBC have hindered their practical applications. Here, we manufactured BSBC using bamboo processing residue powders as raw materials through high-consistency mechano-enzymatic (HCME) pretreatment, followed by hot pressing. Microscopic examination revealed that HCME pretreatment facilitated bamboo fiber defibrillation, generating subfibrous branches and fragmented parenchyma cells with increased specific surface areas. The mechanical interlocking structure enabled BSBC to achieve a combination of mechanical reinforcement and densification. After 8 h of HCME pretreatment, the porosity of BSBC was only 3.27%, which was 57.1% lower than that without pretreatment. BSBC also demonstrated superior water resistance and mechanical performance. It exhibited a low thickness swelling rate (5.1%), which is a 50.5% reduction compared with BSBC manufactured without HCME pretreatment. Moreover, BSBC exhibited high flexural strength (37.8 MPa) and high internal bonding strength (1.84 MPa) after 8 h of HCME pretreatment, significantly surpassing the industry standard for furniture-grade medium-density fiberboards. Environmentally friendly BSBC, based on HCME pretreatment, is anticipated to be a promising alternative to traditional fiberboards in the furniture industry.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Jiayu Xu,Tongxin Sun,Yuan Guo,Taotao Wu,Jinge Hu,Yunhao Lin,Longyuan Yang,Ying Gao,Tianruo Shen
Hydrothermal treatment is a beneficial method for the resource utilization of biomass waste, producing hydrochar and an aqueous phase containing valuable organic products. However, the pathway for recovering high-value products from the aqueous phase remain insufficiently explored. This work presents an innovative enzymatic-hydrothermal treatment designed to enrich the concentration of nitrogen-containing compounds in the hydrothermal aqueous phase (AP) derived from nitrogen-rich biomass. A detailed analysis of the post-enzymatic AP products was carried out, with a specific emphasis on tracking changes in the chemical composition of the AP. The results showed a significant increase in the nitrogen content of the soymeal-derived AP after enzymatic pre-treatment followed by hydrothermal treatment at 220 °C. Meanwhile, valuable platform compounds such as furfural and 5-hydroxymethylfurfural were produced via isophorone-catalyzed decarboxylation of α-amino acids within the enzymatic soymeal AP, steered by deliberate modifications in the reaction pathway. Moreover, a working mechanism for this catalytic decarboxylation process was proposed, enabling precise adjustments to the composition of the AP.
研究领域:
生物质转化
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生物资源技术
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化学工程
·
绿色化学
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产品关联
DOI
高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2025
·
IF 3.7
Yang Zou,Yanfen Zhang,Wenjuan Gu,Ruquan Huang,Pengfei Guo,Jikuan Pan,Huiyu Xie,ZheKai Lin,ChuLi Ma,Huawei Duan
In this study, the effectiveness of enzymatic treatments on cellulose for improving the properties of moulded pulp products was investigated. Three treatment systems were evaluated: laccase (L) alone, an L/lauryl gallate (LG) binary system, and a L/LG/chitosan (CTS) ternary system. The optimal conditions for the L/LG/CTS system were determined as 40.0 U·g −1 L, 1.0 wt.% LG, 1.0 wt.% CTS, 3.0 wt.% pulp consistency, a reaction temperature of 50°C, and a reaction time of 4 h. Compared with untreated moulded pulp products, which exhibited poor barrier properties (static water contact angle: 0°, Cobb 60 : 141.21 ± 5.24 g·m −2 , Kit test: 0/12) and limited mechanical performance (tightness: 1.04 ± 0.03 g·cm −3 , tensile index: 29.86 ± 1.32 N·m·g −1 , bursting index: 0.85 ± 0.07 kPa·m 2 ·g −1 , tear index: 5.72 ± 0.28 mN·m 2 ·g −1 , folding resistance: 82 ± 2), the L/LG/CTS-treated products demonstrated notable improvements. Specifically, hydrophobic/oleophobic properties improved markedly (static water contact angle: 104.5° ± 2.9°, Cobb 60 : 14.83 ± 0.71 g·m −2 , Kit test: 8/12) and mechanical strength increased substantially (tightness: 1.18 ± 0.03 g·cm −3 , tensile index: 34.78 ± 0.96 N·m·g −1 , bursting index: 1.88 ± 0.09 kPa·m 2 ·g −1 , tear index: 6.23 ± 0.30 mN·m 2 ·g −1 , folding resistance: 93 ± 5). SEM analysis revealed changes in fibre arrangement and improved fibre network cohesion in treated samples. These findings indicate that the L/LG/CTS ternary system is a highly effective and sustainable strategy for enhancing both barrier and mechanical properties of moulded pulp products, positioning them as a promising alternative to petroleum-based plastics for food packaging applications. Although the L/LG/CTS system uses biodegradable components, future investigations are required to comprehensively evaluate the biodegradability of the final treated products.
研究领域:
生物技术
·
材料科学
·
高分子科学
·
食品包装
·
环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Ning Wan,Ping Kou,Hong-yi Pang,Yuan-hang Chang,Liu Cao,Chang Liu,Chun-jian Zhao,Cheng-bo Gu,Yu-jie Fu
This work was designed to develop an integrated method of ultrasonic-microwave assisted extraction with enzyme pre-treatment and surfactant aqueous (ES-UME) for the simultaneous extraction of essential oil and flavonoids from Baeckea frutescens . The optimal parameters confirmed by single factor optimization combined with Box-Behnken Design were as follows: Cellulase and Hemicellulase concentration 10% (w/v), Triton X-114 concentration 2% (w/v), extraction time 1.5 h, ultrasonic power 478 W, microwave power 535 W, and liquid/solid ratio 16 mL/g. Under the optimal parameters, the extraction yields of essential oil and main five representative flavonoids epicatechin , rutin , isoquercitrin , myricetin , and quercetin reached 6.38, 0.53, 18.58, 10.72, 1.68, and 2.11 mg/g, respectively. Compositional analysis revealed α -Pinene (16.13%), Linalool (15.00%), 4-Carvomenthenol (10.98%), β -Caryophyllene (6.52%), and α -Terpineol (5.43%) were the most prominent components of essential oil. Furthermore, the essential oil exhibited broad-spectrum antimicrobial activity against 7 tested strains and excellent antioxidant activity through DPPH (2, 2-diphenyl-1-picrylhydrazyl), ABTS (2, 2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)), and antibacterial assays. Moreover, flavonoids extracts were preconcentrated by 9.70-fold compared with the original extracts using the cloud-point property of surfactants. Overall, the developed method was a potential and desirable alternative that can simultaneously extract volatile and non-volatile bioactive constituents from plant materials in food , healthy, and pharmaceutical industries.
研究领域:
食品科学
·
药学
·
化学工程
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Kexin Hou,Meili Bao,Lu Wang,Hua Zhang,Lei Yang,Haitian Zhao,Zhenyu Wang
In this study, in order to simultaneously extract procyanidins and essential oil from pinecones of Pinus koraiensis , aqueous enzymatic pretreatment ionic liquid–lithium salt based microwave–assisted extraction (AEILLME) with a modified hydrodistillation concatenated Soxhlet extraction apparatus was proposed. 1-Butyl-3-methylimidazolium bromide solution was selected as extraction solvent , while LiCl and mixture of cellulase and pectinase (1:1, w/w) as additives by single factor experiment. Other parameters that affect the yield of target components were investigated and optimized by Plackett–Burman design and Box–Behnken design. The obtained optimal conditions were: microwave irradiation power 581.49 W, microwave irradiation time 15.95 min and liquid–solid ratio 11.91 mL/g. Under the optimized conditions, the predicted yields of oligomeric procyanidins, polymeric procyanidins and essential oil were 13.02, 32.19 and 7.76 mg/g, respectively. Analysis of chemical constituents in the essential oil was performed on gas chromatography–mass spectrometry and there was no significant difference on the components of essential oil obtained by proposed method and traditional methods. Ionic liquids were successfully recycled and reused, which could lower the process cost and being beneficial to industrial production. This study provides an approach with good prospects for the application in extracting active components from natural plant material.
研究领域:
化学工程
·
分析化学
·
植物化学
·
天然产物
·
提取技术
✓ 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）