Biomass Conversion and Biorefinery
·
2020
·Vol. 13
·期 2
·647-660
·
IF 2.602
Nalawade Ketaki,Saikia Paharika,Behera Shuvashish,Konde Kakasaheb,Patil Sanjay
The bioprospecting of sugarcane bagasse (SCB) through alkali, acid, and hydrodynamic cavitation pretreatment methods and their combinations were evaluated based on bagasse composition, enzymatic hydrolysis, and lactic acid productivity using Bacillus coagulans NCIM 5648. From 100.0 g of SCB, L-lactic acid production of 26.16 g, 8.78 g, 14.15 g, 14.33 g, and 24.61 g in alkali, acid, sequential acid-alkali, sequential alkali-acid, and cavitation with alkali pretreatment was obtained, respectively. Considering the holistic approach from SCB to L-lactic acid, alkali pretreatment is found to be the best method with L-lactic acid titer of 68.7 g/L, the productivity of 2.86 g/L/h, and yield of 0.92 g/g which has resulted in 82.5% higher product yield from SCB as compared to alkali-acid pretreatment. Cavitation in presence of alkali evolved as the next better route with L-lactic acid titer of 62.5 g/L, the productivity of 2.60 g/L/h, and yield of 0.92 g/g. Though the highest glucose release of 89.3 g/L was achieved during enzymatic hydrolysis with sequential alkali-acid-pretreated SCB that resulted in the highest L-lactic acid titer of 71.8 g/L, the productivity of 2.99 g/L/h and fermentation yield of 0.90 g/g.
研究领域:
生物技术
·
可再生能源
·
发酵工程
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 10
·7345-7358
·
IF 1.833
Wang Ruikun,Zhao Zhenghui,Liu Jianzhong,Lv Yukun,Ye Xuemin
Municipal wastewater sludge (hereafter, sludge) is economically recycled by mixing with coal to prepare slurry fuels, called coal sludge slurry (CSS). However, raw sludge needs to be pretreated before being prepared as CSS because of its high viscosity. Alkali and ultrasonication pretreatment can effectively disrupt the sludge flocs and improve slurrying performance. The alkali pretreatment method takes a long time but has a low cost, whereas the ultrasonication pretreatment method needs a high energy input but takes a short time. This study combined these two methods with complementary advantages to reduce the sludge pretreatment time and ultrasonication energy demand to improve the slurrying performance for sludge. Results showed that, compared with only alkali and only ultrasonication, the combined alkali and ultrasonication pretreatment method had stronger effects on reducing slurry viscosity. The characteristic viscosity η
c of CSS prepared by raw sludge was 1663.60 mPa s. It was reduced to 1033.44 and 1472.10 mPa s, respectively, after the sludge was only pretreated by NaOH and Ca(OH) 2 at a dosage of 10 % dry sludge (DS) for 2 h, while it was reduced to 1205.43 mPa s after the sludge was only pretreated by ultrasonication of 30 kJ/g DS. After combined pretreatment, η
c of CSS was reduced to 774.98 mPa s (NaOH of 10 % DS for 2 h + ultrasonication of 30 kJ/g DS) and 1083.24 mPa s (Ca(OH) 2 of 10 % DS for 2 h + ultrasonication of 30 kJ/g DS), respectively. Apparently, the combined method can effectively decrease the alkali dosage or the ultrasonication energy input.
研究领域:
环境科学
·
能源工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Liao,Ling Ding,Yong Zhang,Wenkun Zhu
In this work, three kinds of biochars (PMBC-H 2 O, PMBC-PP and PMBC-HP) with excellent adsorption performance were obtained by carbonizing pig manure pre-treated with different agents. These biochars had the ordered mesoporous structures and possessed abundant active functional groups on their surface. The adsorption behaviors of the biochars towards U VI under various conditions were evaluated by batch experiment. The results showed that KMnO 4 and H 2 O 2 could enormously improve the adsorption performance of PMBC to U VI . After KMnO 4 and H 2 O 2 pretreatment , the maximum adsorption capacities of PMBC-PP (979.3 mg/g) and PMBC-HP (661.7 mg/g) were about 2.6 and 1.8 times higher than that of PMBC-H 2 O (369.9 mg/g), respectively, which was much higher than previously reported biochar-based materials. Obviously, KMnO 4 pretreatment leaded to a higher enhancement than that of H 2 O 2 . The removal mechanism of U VI on PMBC-PP was discussed in-depth. The interaction between U VI species and PMBC-PP was mainly ascribed to the abundant active sites on the surface of PMBC-PP. In a word, conversion of pig manure pre-treated with KMnO 4 into biochar not only demonstrates that PMBC-PP has great potential in the treatment of actual uranium-containing wastewater, but also provides a method for the rational utilization of pig manure to reduce the pollution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2025
·Vol. 17
·期 4
·490
·
IF 3
Hao-Yang Ding,Si-Yu Wang,Thangavel Sangeetha,Min-Hua Cui
Triclosan (TCS) is extensively detected in wastewater and waste-activated sludge (WAS). The occurrence and fate of TCS in anaerobic digestion have been well revealed, but the change in TCS during WAS pretreatment needs to be clarified. Thermal hydrolysis pretreatment has been proven to be efficient for both WAS hydrolysis and TCS removal, with a removal efficiency of 54.0% and a retention time of 90 min at 170 °C. Alkaline pretreatment remarkably changed the TCS distribution between the sludge and liquid, and the solid–liquid distribution coefficient decreased by three orders of magnitude as the pH increased to 13. Neither alkaline pretreatment nor thermal–alkaline pretreatment resulted in the obvious removal of TCS. UP demonstrated limited efficiency in the hydrolysis of WAS, as well as the migration and removal of TCS. Thus, this study demonstrated that pretreatment methods and operational parameters significantly influence the migration and removal of TCS. It also provides a valuable reference for future studies on the migration and degradation behavior of TCS during anaerobic digestion and lays a foundation for the development of WAS treatment engineering capable of efficiently removing TCS.
研究领域:
环境科学
·
污水处理
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2024
·
IF 3.3
Ruixia Chen,Xiao-Chen Liu,Xianqi Yao,Wei Wang,Junyi Xiang,Igor Tomasevic,Weizheng Sun
BACKGROUND High-sodium intake has been proven to bring serious risks to public health. A potential sodium substitute of salt taste-enhancing hydrolysate (STEH) of protein has been focused on recently. The salt taste-enhancing activity (STEA) of STEH still needs to be improved. High-pressure and calcium chloride (CaCl 2 ) pretreatments were reported to affect proteolysis and promote the release of bioactive peptides. Hence, we investigated effects of high-pressure and CaCl 2 pretreatments on hydrolysis and STEA of STEH derived from spent hen. RESULTS The pretreatments significantly influenced STEA of spent hen meat hydrolysate (SHH), especially 200 MPa pressure and 80 mmol L −1 CaCl 2 pretreatments increased 27.1% salt taste intensity of SHH compared to that of blank (without pretreatments) according to sensory evaluation, the SHH umami also increased after pretreatments. In SHH, the proportion of peptides < 1000 Da increased up to 79.37% after the pretreatments compared to 73.68% of the blank. The degree of hydrolysis (DH) increased to 19.45% for moderate high-pressure (200 MPa) from 18.02% for blank, and the DH decreased after higher high-pressure and CaCl 2 pretreatments, especially for CaCl 2 in 80 mmol L −1 . The change in particle size distribution of SHH has similar trends to DH. CONCLUSION High-pressure and CaCl 2 pretreatments increased STEA of SHH by affecting hydrolysis process. The STEA increase may be related to increased small-peptide proportion in SHH. Meanwhile, moderate high-pressure may promote protein unfolding and further increase DH according to particle size distribution of SHH. The combination of proteolysis and pretreatments of high-pressure and CaCl 2 is a promising method to produce STEH. © 2024 Society of Chemical Industry.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Jie Chen,Xiaoyi Yang,Xiaolu Xia,Lin Wang,Shuyi Wu,Jie Pang
Konjac glucomannan (KGM) gel has attracted widespread interest in the field of food. However, the low texture properties of gel limit its further application. In this study, the effect of KGM powder under different processing times (8 h, 12 h, 24 h and 48 h) and temperatures (4 °C, −18 °C, −80 °C) on the texture properties of gels were investigated. According to result of texture profile analysis (TPA) and puncture test, the gel prepared by pretreatment showed good texture characteristics. The gel prepared by freezing KGM powder at −18 °C for 8 h has the best gel strength in the sample, which is 1.6 times that of native KGM. The molecular weight of KGM decreased significantly after pretreatment (from 12.30 × 10 5 Da to 0.29 × 10 5 Da). In addition, low temperature and freezing treatment can influence the rheological behavior and regulate water composite in gel. According to experimental result, it can be attributed to that low temperature and the growth of ice crystal can make structures denser, promote KGM molecular chain entangled and increase the number of hydrogen bond . This study provides a convenient and effective method for improving the gel properties.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FOOD PROCESS ENGINEERING
·
2024
·Vol. 47
·期 7
·e14697
·
IF 2.7
Dianyuan Wang,Min Zhang,Yaping Liu
In order to increase the content of flavoring components and nutrients in the stock, effects of microwave (MW) combined with ultrasonic pretreatment on water-soluble proteins, flavor nucleotides, volatile gas constituents and sensory evaluation in the stewed stock were explored. The results showed that, compared with the control group (CK), MW, and ultrasonic (US) pretreatment could significantly promote the degradation of nucleotides and form a large number of 5′-flavor nucleotides. The combined treatment of MW and US promoted protein hydrolysis and increased the content of water-soluble protein. The microwave combined ultrasonication pretreated stew stock had the brightest color and the overall sensory score was better than that of the CK. In addition, GC–MS analysis showed that a total of 49 volatile substances were detected in the stock samples. After microwave combined ultrasonication pretreatment, the relative contents of aldehydes and alcohols in the stock increased significantly. The sensor response value of the electronic nose was the highest, indicating that the intensity of flavor characteristics increased. Therefore, MW combined with ultrasonic pretreatment can effectively promote the formation and dissolution of nutrients, and increase the content of flavorful nucleotides and volatile gases. Practical application This study provides a novel processing method for traditional stewed stock. Ultrasonic combined with MW treatment can quickly degrade the protein in the raw material and dissolve it into the stock. At the same time, it promotes the formation of flavor nucleotides and accelerates the Maillard reaction to produce more flavor substances. The technology has the advantages of short processing time, environmental protection and safety. It can be used as a potential pretreatment technology to regulate the flavor of stock-soup.
研究领域:
食品科学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaoling Hong,Qiao Zhao,Yanping Chen,Xiaotao Zu,Wei Liu,Jian Liu
Reconstruction of heterogeneous catalyst is essential for understanding the structure-performance relationship, however, it still remains limitations of the methodology development. Herein we reveal a gas induced activation strategy to reconstruct the surface of CuZnO x /mSi catalyst through pretreating it in various environments, including CO, H 2 , and H 2 &CO mixture. Specifically, high resolution scanning transmission electron microscopy as well as elemental distribution analysis disclosed that H 2 pretreatment successfully induced the formation of active Cu nanoparticles which uniformly dispersed on amorphous ZnO layer, whereas CO pretreatment led to the reconstruction of Cu nanoparticles/cluster, resulting in the formation of CuC x nanofibers under the high temperature reaction environment. The catalytic activity of the H 2 -treated CuZnO x /mSi-H 2 is about three times higher than that of the CO-treated CuZnO x /mSi-CO for methanol synthesis. This gas atmosphere induced catalyst reconstruction strategy might pave the way for the rational catalyst design with precise active phase.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Xiudong Zhang,Yuanyuan Bai,Xuefei Cao,Runcang Sun
Herein, an efficient biphasic pretreatment process was developed to improve the production of furfural (FF) and glucose from Eucalyptus . The influence of formic acid and NaCl on FF production from xylose in water and various biphasic systems was investigated. Results showed that the addition of formic acid and NaCl significantly promoted the FF yield, and the biphasic system of MIBK (methyl isobutyl ketone)/water exhibited the best performance for FF production. Then the Eucalyptus was pretreated in the MIBK/water system, and a maximum FF yield of 82.0% was achieved at 180 °C for 60 min. Surface of the pretreated Eucalyptus became relatively rough and loose, and its crystallinity index increased obviously due to the removal of hemicelluloses and lignin. The pretreated Eucalyptus samples showed much higher enzymatic hydrolysis rates (26.2–70.7%) than the raw Eucalyptus (14.5%).
研究领域:
生物化学
·
可再生资源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xue Qin Zhu,Shi Lin Zhang,Jia Wen Duan,Yan Ding,Tie Hua Zhang,Zhou Yong Dong
In order to explore the characteristics of different physical pretreatment, this study focused on the effects of ultrasound (UP), microwave (MW), high-pressure heating (HPH) and mechanical milling (MM) pretreatment on the enzymolysis effect and flavor characteristics of high-temperature soybean meal. The enzymatic hydrolysis efficiency of HPH group was the highest, with the highest hydrolysis degree (24.01 ± 0.15 %), the highest soluble peptide content (15.69 ± 0.16 mg/mL) and the highest content of components <180 Da (16.09 ± 0.22 %). MW group had the highest content of umami and sweet amino acids (619.94 mg/100 mL) and the strongest antioxidant capacity. MW group not only had better umami but the bitterness of HPH group was the most obvious. In addition, MW promoted the formation of pleasant volatile compounds such as esters, and reduced the content of 1-octene-3-alcohol. Generally speaking, MW is an effective technology to improve the enzymatic hydrolysis performance and flavor characteristics of high-temperature soybean meal.
研究领域:
食品科学
·
农产品加工
·
蛋白质化学
·
食品风味
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
·
食品科学
✓ 已验证
DOI
高影响因子
Processes
·
2023
·Vol. 11
·期 3
·688
·
IF 3.5
Abidemi Oluranti Ojo,Olga de Smidt
Lactic acid (LA) has broad applications in the food, chemical, pharmaceutical, and cosmetics industries. LA production demand rises due to the increasing demand for polylactic acid since LA is a precursor for polylactic acid production. Fermentative LA production using renewable resources, such as lignocellulosic materials, reduces greenhouse gas emissions and offers a cheaper alternative feedstock than refined sugars. Suitable pretreatment methods must be selected to minimize LA cost production, as the successful hydrolysis of lignocellulose results in sugar-rich feedstocks for fermentation. This review broadly focused on fermentative LA production from lignocellulose. Aspects discussed include (i). low-cost materials for fermentative LA production, (ii). pretreatment methods, (iii). enzymatic hydrolysis of cellulose and hemicellulose, (iv). lactic acid-producing microorganisms, including fungi, bacteria, genetically modified microorganisms, and their fermentative pathways, and (v). fermentation modes and methods. Industrial fermentative lactic acid production and purification, difficulties in using lignocellulose in fermentative LA production, and possible strategies to circumvent the challenges were discussed. A promising option for the industrial production and purification of LA that contains enzyme and cell recycling continuous simultaneous saccharification and fermentation coupled with membrane-based separation was proposed. This proposed system can eliminate substrate-, feedback-, and end-product inhibition, thereby increasing LA concentration, productivity, and yield.Keywords:lactic acid;lignocellulose;pretreatments;fermentation;microorganisms
研究领域:
生物工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）