JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Shaohua Lv,Yun Hao,Bohao Yang,Linghong Tang
In this article, a calorimeter was established on the basis of steady-flow calorimetry. The present calorimeter was utilized to measure the isobaric heat capacity (cp) of target fluids. First, water was measured to verify the reliability of the experimental system. Then the measurements of cp for methyl hexanoate and ethyl hexanoate were carried out at temperatures from 313 K to 433 K and pressures of up to 10 MPa. To implement easier industrial application, a correlation was proposed on the basis of the experimental data to calculate the cp values of methyl hexanoate and ethyl hexanoate, with maximum absolute relative deviations of 0.77% and 0.65%, respectively. The newly reported data will be helpful for use with methyl hexanoate and ethyl hexanoate.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Yishan Zhou,Hao Qin,Hongye Cheng,Lifang Chen,Bingjian Zhang,Zhiwen Qi
Butyl hexanoate (BuHE) is an important long-chain ester that is widely used in the food, beverage and cosmetic industries. In this work, reactive extraction concept was proposed to intensify the BuHE formation in a biphasic system, in which deep eutectic solvent (DES) comprising 2-methylimidazole (2-MIm) and p -toluenesulfonic acid (PTSA) was used as dual solvent-catalyst. First, the effect of 2-MIm to PTSA molar ratio on esterification was investigated to determine the optimum DES of [2-MIm:2PTSA], which was characterized by FT-IR and TGA. Then, the liquid–liquid equilibrium (LLE) and esterification experiments were carried out to confirm the extraction and catalytic effect of [2-MIm:2PTSA], respectively. Afterwards, the pseudo-homogeneous kinetic model was employed to describe the esterification kinetics. Finally, the intensification mechanism of reactive extraction for BuHE formation was proposed according to the experiments and interaction effect analysis.
研究领域:
化学工程
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Junshuai Chen,Qi Zhou,Taotao Zhan,Maogang He,Ying Zhang
Methyl hexanoate, which was found to be the simplest methyl ester to present a strong cool flame behavior, is expected to be one of the main components of biodiesels. Details of the experimental speeds of sound in methyl hexanoate are scarce up to now. Therefore, the speed of sound in liquid methyl hexanoate was measured by the Brillouin light scattering method in the temperature range of 297.83–588.07 K and at pressures of up to 10 MPa. The relative uncertainty of the speed of sound experimental system is estimated to be less than 0.43%, and when considering the impurity of the sample, the relative uncertainty is 0.47%. The variation of the speed of sound with the temperature and pressure was analyzed. Besides, the correlation for the speed of sound as a function of temperature and pressure is presented based on the experimental data. The absolute average of relative deviation between the experimental data and the calculated results is 0.44%.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2024
·
IF 3.2
Zhao He,Du Binghao,Zhao Pengju,Chen Xi,Zhao Jingrong,Wu Qiuhua,Zhu Lining,Ma Huifeng,Sun Baoguo,Min Weihong,Li Xiuting
AimsEthyl hexanoate, one of the key flavor compounds in Strong-flavor Baijiu. To improve the content of ethyl hexanoate in Strong-flavor Baijiu, a functional strain with high yield of ethyl hexanoate was screened and its ester-producing performance was studied.Methods and ResultsUpon identification, the strain was classified as Candida sp. and designated as ZY002. Under optimal fermentation conditions, the content of ethyl hexanoate synthesized by ZY002 can be as high as 170.56 mg·L−1. A fermentation test was carried out using the ZY002 strain bioaugmented Daqu to verify the role of the strain applied to Baijiu brewing. It was found that strain ZY002 could not only improve the moisture and alcohol contents of fermented grains but also diminish the presence of reducing sugar and crude starch. Furthermore, it notably amplified the abundance of flavor compounds.ConclusionIn this study, Candida sp. ZY002 with a high yield of ethyl hexanoate provided high-quality strain resources for the actual industrial production of Baijiu.
研究领域:
发酵技术
·
食品科学
·
微生物学
·
饮料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Xiwen Jia,Dong Liu,Jiajie Xu,Hui Zhang,Luoyang Liu,Lujia Han,Weihua Xiao,Suan Shi
In this study, caproate was synthesized from corn stover through sequential fermentation, and biochar was prepared from unhydrolyzable corn stover by pyrolysis to utilize full-component of corn stover. The results indicate that the caproate concentration in the unhydrolyzable corn stover biochar (UCSB) group was 2.2 times higher than that of the control group, and the fermentation start-up time was shortened by 18 days. Mechanistic analysis suggested that the rough surface of UCSB facilitated microbial colonization and reduced product inhibition. Genes expression analysis further demonstrated that UCSB significantly upregulated crucial functional genes responsible for ethanol oxidation and the reverse β -oxidation pathway, ultimately resulting in enhanced caproate production. The successful utilization of UCSB derived from unhydrolyzable solid residue effectively boosted fermentation, leading to a 37 % increase in the carbon utilization efficiency of corn stover. This study offering valuable insights for the high-value and full-component utilization of lignocellulosic biomass.
研究领域:
生物技术
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL SCIENCE
·
2024
·Vol. 161
·期 6
·877-886
·
IF 1.7
Xinbao Li,Haopeng Liu,Tongtong Dai,Dong Dong,Guofeng Xu,Yushan Jia,Tao Shao
The work aimed to evaluate the effect of lactic acid bacteria, natamycin and hexanoic acid on the fermentation quality, aerobic stability and in vitro digestibility of total mixed ration (TMR) silages containing water bamboo sheath leaves. The treatments were as follows: (1) no additives (control, C), (2) lactic acid bacteria (L), (3) natamycin (N), (4) hexanoic acid (H), (5) lactic acid bacteria + natamycin (LN), (6) lactic acid bacteria + hexanoic acid (LH). Silos were opened and silages were evaluated to assess fermentation quality, aerobic stability and in vitro digestibility. All TMR silages were well-preserved as indicated by dominant lactic acid content, low ammonia nitrogen/total nitrogen, trace propionic acid and negligible butyric acid contents. All additives improved the fermentation quality and in vitro digestibility, evidenced by higher lactic acid/acetic acid ratio, lactic acid, acetic acid, water-soluble carbohydrate contents and lactic acid bacteria count, and lower pH, aerobic bacteria and yeast counts. The LN had the highest lactic acid, acetic acid, lactic acid/acetic acid ratio, in vitro gas production and in vitro digestibility. During aerobic exposure, the LN silage had the highest lactic acid and acetic acid contents, and the lowest pH among all TMR silages. The LN and LH prolonged aerobic stability, reaching 85.5 and 81.5 h, respectively. The LN is recommended to improve the fermentation quality, aerobic stability and in vitro digestibility of TMR prepared with water bamboo sheath leaves.
研究领域:
动物营养学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2023
·Vol. 12
·期 16
·3029
·
IF 5.2
Yuhang Gao,Yanzhao Zheng,Fei Yao,Fusheng Chen
The aqueous enzymatic method is a form of green oil extraction technology with limited industrial application, owing to the need for the demulsification of the oil body intermediate product. Existing demulsification methods have problems, including low demulsification rates and high costs, such that new methods are needed. The free fatty acids produced by lipid hydrolysis can affect the stability of peanut oil body (POB) at a certain concentration. After screening even-carbon fatty acids with carbon chain lengths below ten, caproic acid was selected for the demulsification of POB using response surface methodology and a Box–Behnken design. Under the optimal conditions (caproic acid concentration, 0.22%; solid-to-liquid ratio, 1:4.7 (w/v); time, 61 min; and temperature, 79 °C), a demulsification rate of 97.87% was achieved. Caproic acid not only adjusted the reaction system pH to cause the aggregation of the POB interfacial proteins, but also decreased the interfacial tension and viscoelasticity of the interfacial film with an increasing caproic acid concentration to realize POB demulsification. Compared to pressed oil and soxhlet-extracted oil, the acid value and peroxide value of the caproic acid demulsified oil were increased, while the unsaturated fatty acid content and oxidation induction time were decreased. However, the tocopherol and tocotrienol contents were higher than those of the soxhlet-extracted oil. This study provides a new method for the demulsification of POB.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yunfei Zhang,Xilun Wang,Yi Shen
The challenge in the electrochemical reduction of levulinic acid (LA) lies in designing highly selective, energy-efficient, and non-precious-metal electrocatalysts that minimize the competitive hydrogen evolution reaction during LA conversion. Herein, we reported a facile pulsed electrodeposition strategy to fabricate bimetallic electrocatalysts with different combinations of lead (Pb), indium (In), tin, and cadmium supported by free-standing carbon felts (CFs). The as-prepared bimetallic self-supporting electrodes were examined for the electrochemical hydrogenation (ECH) of LA. The resulting InPb/CF electrocatalysts showed superior performance among the bimetallic catalysts. In addition, it was demonstrated that the catalytic performance of bimetallic samples was better than that of the corresponding monometallic samples. Notably, the In 72.4 Pb 27.6 /CF exhibited the best performance for ECH of LA, leading to 86.1 % of LA conversion, 99.7 % of selectivity towards valeric acid and 60.8 % of Faradaic efficiency at −1.5 V vs RHE. The excellent performance is mainly attributed to the modification of the electronic structures by the ligand and strain effects. Meanwhile, the relatively high electrochemically active surface area and the low charge transfer resistance are also conducive to improving the catalytic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Lin Yuan,Yunjie Li,Liuyan Zheng,Yifan Qin,Xin Zhang,Lijuan Ma,Huan Zhang,Liping Du
Organic acids are critical flavor contributors in light-flavor Baijiu (LFB). The binding of organic acids and volatile compounds may affect the release of flavor in Baijiu. In this study, the effects of different concentrations of lactic acid, hexanoic acid, butyric acid, and acetic acid on the release of key aroma-active compounds in LFB were investigated. Twenty volatile compounds were identified as key aroma-active compounds in four LFB samples using odor activity values combined with aroma recombination, and omission experiment methods. Furthermore, as the concentrations of organic acids were increased in the simulated LFB solution, significant changes in the release of key aroma-active compounds occurred. The addition of lactic acid from 0.5-fold to 5-fold resulted in all key aroma-active compounds exhibiting stronger releases, especially the addition of a 3-fold concentration of lactic increased the release of key esters to about twice. In contrast, the effect of hexanoic acid, butyric acid, and acetic acid on the release of key aroma-active compounds showed a concentration-dependent trend. This suggests that the specific structures of volatiles and organic acids alter the intermolecular interactions between them, thereby altering the aroma release. The results reveal that different organic acids alter the overall aroma profile by affecting the release of volatile compounds in the LFB matrix.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 3
·e6314
·
IF 3.1
Yufeng Zhao,Dafu Wei,Xiang Xu,Yong Guan
In order to protect the marine environment, traditional marine antifouling coatings such as tributyltin (TBT)-based antifouling coatings have been phased out. There is an urgent need to develop environmentally friendly marine antifouling coatings. In this work, the antibacterial poly(hexamethylene guanidine) (PHMG) was introduced into polyurethane (PU) through chemical bond to prepare a green environmentally friendly marine antifouling coating (PU-PHMG). The morphology, antimicrobial properties, mechanical properties and thermostability of the PU-PHMG films were investigated. The antimicrobial rates of PU-PHMG films against E. coli and S. aureus were both more than 99.9% when PHMG content in the films reached 1.0 wt%. The excellent antimicrobial activities can be maintained for more than 90 days due to the non-leaching characteristic of PHMG. The growth of algae was also inhibited on the surface of PU-PHMG films. The PU-PHMG coating is promising for the applications in marine antifouling field.
研究领域:
海洋生物学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Qiang Hu,Kesi Wang,Liyan Qiu
Clinical extensive application of indocyanine green (ICG) is limited by several drawbacks such as poor bioenvironmental stability, aggregate propensity, and rapid elimination from the body, etc. In this study, we construct a novel amphiphilic mPEG-ACA-ICG conjugate by modifying synthetic heptamethine cyanine derivative ICG-COOH with a hydrophobic linker 6-aminocaproic acid (ACA) and amino-terminal poly(ethylene glycol) (mPEG-NH 2 ). The as-prepared mPEG-ACA-ICG conjugate has the ability to self-assemble into micellar aggregates in an aqueous solution with a lower CMC value than mPEG-ICG conjugate without ACA linker. More importantly, compared with free ICG and mPEG-ICG conjugate, mPEG-ACA-ICG nanomicelles exhibited better stability and higher photothermal conversion efficiency upon near-infrared light irradiation due to the intramolecular introduction of a hydrophobic ACA segment. In our in vivo experiment, mPEG-ACA-ICG nanomicelles ensured the formidable effect on tumor photothermal therapy (PTT) and the maximum tumor inhibition rate reached 72.6 %. In addition, real-time determination ability for fluorescence image-guided surgery (FIGS) of mPEG-ACA-ICG nanomicelles was also confirmed on tumor xenograft mice model. Taken together, mPEG-ACA-ICG conjugate may hold great promise for non-invasive cancer theranostics.
研究领域:
生物医学工程
·
肿瘤学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
E-POLYMERS
·
2021
·Vol. 21
·期 1
·500-510
·
IF 2.025
Xiaoguang Ying,Jieyuan He,Xiao Li
An imprinted electrospun fiber membrane was developed for the detection of volatile organic acids, which are key components of human body odor. In this study, hexanoic acid (HA) was selected as the target, polymethyl methacrylate (PMMA) was used as the substrate, and colorimetric detection of HA was achieved by a bromocresol purple (BCP) chromogenic agent. The results showed that the morphology of the fiber membrane was uniform and continuous, and it showed excellent selectivity and specificity to HA. Photographs of the color changes before and after fiber membrane adsorption were recorded by a camera and quantified by ImageJ software by the difference in gray value (ΔGray). This method is simple, intuitive, and low cost and has great potential for application in human odor analysis.
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 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）