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
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Zheng Zhou,Shuang Cui,Bo Wang,Dayong Zhou,Xuhui Huang,Lei Qin
Heat, light, and microwave treatments differentially modulate food flavor profiles through lipid oxidation, but the mechanistic distinctions remain unclear. This study monitored and compared lipid molecular species and flavor compounds in salmon oil processed by these methods via multi-omics technology. Thermal treatment yielded the highest concentrations of alkanes, alkenals, enols, and aldehydes (50.09 % of total volatiles), predominantly C 5 –C 10 compounds. Light treatment generated alkenes, enols, alcohols, and alkanes (74.85 % of total volatiles), primarily C 4 –C 5 and C 8 compounds. Microwave processing enriched enols, benzenes, alkenals, and alkenes (72.28 % of total volatiles), predominantly C 4 –C 10 compounds. Volatiles were primarily derived from polyunsaturated triglycerides, with even‑carbon fatty acids undergoing chain shortening to odd‑carbon species during reaction. Microwave-induced lipid oxidation mechanism was linked to both thermal and photo oxidation, attributing to its electromagnetic wave properties and thermal effects. These findings provide a theoretical basis for precise flavor modulation through combining several processing methods
研究领域:
食品科学
·
化学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Science & Nutrition
·
2021
·Vol. 9
·期 7
·3863-3872
·
IF 2.863
He Yangbo,Li Yongfu,Luo Xingbang,Li Guolin,Duan Zhaoyan,Chen Chaojun
In the present study, we investigated the effects of thermal preservation, such as pasteurization, and nonthermal preservation, including irradiation, sodium dehydroacetate (SDHA), and nisin, on the quality of red sour soup after storage. Single-factor experiments were used to optimize the parameters of different processing technologies, and the best irradiation dose and heating temperature were 4 kGy and 85℃, respectively. The optimal additive amounts of SDHA and nisin were 150 mg/500 g. During the shelf storage experiment, prepared red sour soup was stored at room temperature in the glass bottles, and further analyses were carried out up to 5 weeks of storage. The quality of red sour soup was evaluated by microflora and sensory analysis. The results showed that Lactobacillus , Streptomyces, Pediococcus , Pichia , Kazachstania , and Candida were the main microorganisms in all samples, and there were no harmful microorganisms. The sensorial attributes were observed, including different parameters, such as odor, organic acid content, color, taste, texture, apparent viscosity, and thixotropy. All of the data showed that the irradiated groups were more dramatically changed compared with the other groups, while these changes did not directly affect the sensory quality of the products. Consequently, irradiation could be used as an ideal quality preservation method for the red sour soup to reduce the impact of heat treatment and chemical additives on the quality of characteristic food.
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
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
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Cheng Wang,Shaozheng Leng,Huidong Guo,Liyun Cao,Jianfeng Huang
Hydrophilicity/hydrophobicity property of zeolite has been received much attention in recent years. Regulation of hydrophilicity/hydrophobicity of zeolite using relative simply process and cheap raw materials is needed to be further investigated and solved. The aim of this study is to investigate effect of acid and alkali treatments on structure, hydrophilicity/hydrophobicity of natural zeolite. The structure of the samples was characterized using ICP , XRF , XRD , laser particle size analyzer, N 2 adsorption-desorption, XPS, SEM-EDX, etc. The hydrophilicity/hydrophobicity of the samples was determined using water vapor adsorption method coupled with BET specific surface area results. The results showed that acid treatment removed 5.05–23.26 wt% of aluminum from the framework of clinoptilonite using 0.1–3 M nitric acid while alkali treatment removed 0.49–7.64 wt% of silicon from the framework of clinoptilonite using 0.05–0.8 M sodium hydroxide. Accompanied by the removal of Al and Si, the specific surface area of zeolite obviously increased and decreased, respectively. Water vapor adsorptions on the alkali and acid treated zeolites with ascending SiO 2 /Al 2 O 3 ratio gradually decreased which confirmed the increase of hydrophobicity and decease of hydrophilicity for the samples. This acid/alkali treatment method appears to be a simple and effective way to regulate hydrophilicity/hydrophobicity of natural zeolite.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2017
·Vol. 49
·期 12
·1249-1255
·
IF 1.132
Cheng Wang,Liyun Cao,Jianfeng Huang
Natural zeolite was first acid treated and then heat treated. The influences of acid and heat treatments on the structure and water vapor adsorption property of natural zeolite were investigated. X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TG), and Brunauer-Emmett-Teller (BET) surface areas were employed to investigate the structure changes of the zeolite samples. Water vapor adsorption property of the samples was investigated in order to determine wettability of the samples. The results showed that nitric acid treatment could remove Al from the structure, decrease relative crystallinity, and significantly increase specific surface area of the zeolite samples. Heat treatment could change or even destroy the structure, effectively remove water molecules from the surface/structure, and decrease the specific surface area of the zeolite samples. Water vapor adsorptions on the acid-treated zeolite samples were significantly lower than that for the zeolite sample, and the adsorptions further reduced for the heat-treated zeolite samples. The increase of Si/Al ratio, decreases of silanol groups, and specific surface area of the samples were major reasons related to the reductions of water vapor adsorptions on the zeolite samples.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 3
·925
·
IF 3.748
Weihua Chen,Jiancheng Tang,Peidong Cheng,Yunlong Ai,Yi Xu,Nan Ye
2D layered MXene (Ti3C2Tx) with high conductivity and pseudo-capacitance properties presents great application potential with regard to electrode materials for supercapacitors. However, the self-restacking and agglomeration phenomenon between Ti3C2Txlayers retards ion transfer and limits electrochemical performance improvement. In this study, a 3D porous structure of Ti3C2Txwas obtained by adding alkali to a Ti3C2Txcolloid, which was followed by flocculation. Alkaline-induced flocculation is simple and effective, can be completed within minutes, and provides 3D porous networks. As 3D porous network structures present larger surface areas and more active sites, ions transfer accelerates, which is crucial with regard to the improvement of the superior capacitance and rate performance of electrodes. The sample processed with KOH (K-a-Ti3C2Tx) exhibited a high capacity of approximately 300.2 F g−1at the current density of 1 A g−1. The capacitance of the samples treated with NaOH and LiOH is low. In addition, annealing is essential to further improve the capacitive performance of Ti3C2Tx. After annealing at 400 °C for 2 h in a vacuum tube furnace, the sample treated with KOH (K-A-Ti3C2Tx) exhibited an excellent specific capacitance of approximately 400.7 F g−1at a current density of 1 A g−1, which is considerably higher than that of pristine Ti3C2Tx(228.2 F g−1). Furthermore, after 5000 charge–discharge cycles, the capacitance retention rate reached 89%. This result can be attributed to annealing, which can further remove unfavourable surface groups, such as –F or –Cl, and then improve conductivity capacitance and rate performance. This study can provide an effective approach to the preparation of high-performance supercapacitor electrode materials.Keywords:Ti3C2Tx;alkaline treatment;annealing treatment;3D porous structure;supercapacitors
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 103
·期 2
·666-679
·
IF 4.125
Jun Tian,Fengyun Cheng,Yurou Yun,Junjie Yi,Shengbao Cai,Linyan Zhou
BACKGROUND Recently, cloudy pomegranate juice (PJ) has become popular due to its rich phenolic and health-promoting effects. The aim of the present work was to evaluate the application of high hydrostatic pressure processing (HPP), pasteurization (PT) and high-temperature short-time sterilization (HTST) on physicochemical properties (color, flow behavior, turbidity, sugars, organic acids, aroma and sensory evaluation) and in vitro bioaccessibility of total phenolics content (TPC), total flavonoids content (TFC) and phenolics of cloudy PJ. RESULTS Compared to HPP, thermal sterilization significantly increased the brightness ( L *), redness ( a *), total color difference (Δ E ) and turbidity, and decreased the TPC and TFC. HPP maintained the volatile profile of cloudy PJ better, while thermal sterilization significantly changed the profile by decreasing alcohols 23.8–32.7% and increasing acids by 33.6%–182.8%. The bioaccessibility of flavonoids, phenolic acids and tannins in the control cloudy PJ after in vitro oral-gastric-intestinal digestion were 1.5%, 4.9%, and 9.0%, respectively, which were not significantly changed by different treatments. CONCLUSION These results contributed to promoting the color quality and health benefits of cloudy PJ rich in phenolics by optimizing the processing conditions in the food industry. © 2022 Society of Chemical Industry.
研究领域:
食品科学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Iranian Chemical Society
·
2022
·Vol. 19
·期 7
·2883-2890
·
IF 2.271
Fu Qiuping,Lou Jie,Shi Denghong,Zhou Shaoqi,Hu Jing,Wang Qi,Huang Weijiang,Wang Kui,Yan Wei
Multi-walled carbon nanotubes (MWCNTs) were treated by reflux oxidation in a mixture (HNO 3 and H 2 SO 4 ), hydroxyl (–OH) and carboxyl (–COOH) functional groups were introduced on the surface of MWCNTs to obtain the Oxidized-MWCNTs (OMWCNTs). OMWCNTs were used as adsorbent to removal of Pb(II) from wastewater. The effects of contact time, initial concentration of Pb(II), OMWCNTs dosage, pH and coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) on the adsorption and removal of Pb(II) by OMWCNTs were systematically studied. The adsorption of Pb(II) by OMWCNTs could reach equilibrium in 10 min. The pH > 5 is conductive to the adsorption of Pb(II) by OMWCNTs. The coexisting ions (K + , Na + , Ca 2+ , Mg 2+ ) had almost no effect on the adsorption of Pb(II) by OMWCNTs. The results showed that the isothermal data fit the Freundlich and Langmuir isotherm models. The maximum adsorption capacity was 558.66 mg/g for Pb(II) from Langmuir isotherm. The pseudo-second-order kinetic model could well describe the adsorption process of Pb(II).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2020
·Vol. 58
·期 3
·1061-1071
·
IF 1.946
Zhang Bin,Zheng Zhenjia,Liu Nan,Liu Pengli,Qiu Zhichang,Qiao Xuguang
The aim of this study was to investigate the effects of the sequence of different thermal and mechanical treatments on the physicochemical parameters and microstructure of garlic paste, in order to improve the quality of the product. The total organosulfur compounds (OSCs) decreased steadily in blended-heated garlic, whereas OSCs decreased sharply after 2 min at 75 °C or 5 min at 85 and 95 °C in heated-blended garlic. After blanching for 5 min, allicin could maintain over 4.0 mg/g only at 75 °C; and OSCs of heated-blended garlic paste were found to drop by 29.56%, 90.63% and 94.79% at 75, 85 and 95 °C, respectively. In blended-heated garlic, the color values of L * (lightness) and a * (redness) decreased ( P < 0.05), while the b * (yellowness) and C * (chroma) increased ( P < 0.05), obtaining green discoloration garlic paste. The total color differences of blended-heated samples were greater than 12.08, which were 2–6 folds higher compared with heated-blended garlic. Total phenolic content and antioxidant activity decreased ( P < 0.05) in all thermal treatments, thermal treatment of heated-blended garlic less than 5 min maintained over 30% of antiradical activity. The sequence of unit operations determined the pattern of garlic microstructure disruption, resulting in various enzymic and non-enzymic reactions. Our results indicated that use of heat treatment prior to blend processing is an effective and feasible method to inhibit garlic discoloration and retain high content of bioactive OSCs. It is recommended that garlic paste be prepared using heated-blended processing, with thermal processing limited to 75 °C for less than 5 min.
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2023
·Vol. 38
·期 3
·449-457
·
IF 1.2
Chen Gong,Shujie Fan,Bin Yang,Yu Zhang,Jianping Ni,Zhenhua Su
The aim of this study was to investigate an effective approach for improving the dissolving pulp properties for making specialty fiber. The caustic and enzymatic treatment of the properties of dissolving pulp was conducted by analyzing the macromolecular structure and chemical composition. The results showed that the enzymatic treatment was more effective on influencing the macromolecular properties, while the caustic treatment had more influence on structural changing, mainly cellulose crystal structure and crystallinity. Meanwhile, to maintain a higher purity and higher brightness, caustic treatment would be beneficial in comparison with enzymatic treatment. The performance of caustic treated sample was evaluated in regarding to chemical composition and acetylation reaction performance, using commercial pulp as reference. The competitive feature of treated sample suggested its potential in future application.
研究领域:
制浆造纸工程
·
生物化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Nian Cheng,Weiwei Li,Zhenhua Yu,Changlei Wang,Fei Qi,Pei Liu,Yuqing Xiao,Xing-Zhong Zhao
It is a great challenge to prepare high quality perovskite films in ambient atmosphere with high humidity (≥ 50%), since the commonly adopted two step sequential deposition process produces perovskite films with rough surfaces and a large amount of residual PbI 2 . To solve these problems, a facile method using combined solvent and vapor treatment is proposed. The residual PbI 2 is diminished through a solvent treatment process, and then smooth perovskite surface with micrometer scaled perovskite particles is obtained with a CH 3 NH 2 vapor treatment. The quality of the obtained perovskite films is examined in the hole transport material free perovskite solar cells, and power conversion efficiency is boosted up by 17.3% compared with the traditional method. When a CuPc hole transport layer is further introduced, carbon counter electrode based perovskite solar cells exhibit a superior power conversion efficiency of 16.61%. Thus this method shows great potential in further optimizing the performance of perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）