SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Peng Chen,Xie Liu,Zhihao Lu,Liang Jin,Lankun Cai,Lehua Zhang,Hualin Wang,Ying Yan
Attention is drawn to the freezing method for separating organic contaminants from industrial wastewater and simultaneously recovering valuable materials, but the mechanism regarding functional group of organic contaminants how affect ice purity remains unclear. In this work, four types of organics, including hexane , hexanoic acid, N-hexanol and N-hexanal, with various oxygen functional groups were selected as organic contaminants and studied to be separated from aqueous solutions by the suspension freezing method. Experimental results revealed that their separation efficiencies were 67.07%, 87.75%, 94.71% and 95.32%, respectively, after freezing 30 min at 200 rpm and −0.9 °C. The presented theoretical work reveals that hexane, as a non-polar organic contaminant without function group, unable to form hydrogen bonds with water clusters, making it more readily to precipitate and stick on ice surface during freezing, which significantly increased ice impurities with the lowest separation efficiency. Presence of functional group promotes organics to solute in concentrate via forming H-bond with water clusters, and thus improves ice purity by avoiding of precipitation. Hexanoic acid with the largest absorption energy with ice crystal tend to adsorb on ice surface but not stay in concentrate and showed the highest ice impurity corresponding to lowest separation efficiency. This work provides new sight for understanding declination of ice purity and separation efficiency caused by functional group of organic contaminants during freezing.
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高影响因子
JOURNAL OF FOOD BIOCHEMISTRY
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2020
·Vol. 44
·期 9
·e13362
·
IF 1.662
Guohua Wei,Yong Ye,Xiang Yan,Xingyu Chao,Fan Yang,Mengyang Wang,Wencheng Zhang,Chuanxun Yuan,Qingmei Zeng
Banana ( Musa nana Lour .) have the effect of anti-obesity and lipid modulating properties. However, the influences of banana pulp dietary fibers (BP-DF) on metabolic syndrome (MetS) and gut microbiota (GM) are unknown. In this research, we explore a novel strategy for dietary BP-DF on attenuation of lipid metabolic disease, GM disorder, and associated mechanisms in high-fat diet (HFD) mice. BP-DF can strongly suppress on HFD caused body weight and epididymal fat mass gain, and significantly improved serum lipid profiles, liver lipid profiles, and intestinal function. BP-DF also significantly improved fecal short-chain fatty acids formation and fecal ammonia content. BP-DF impacted the intestinal microorganism at all kinds of taxonomic levels by increasing the proportions of beneficial Lactobacillus , Bacteroidales _S24_7_group, and Alloprevotella and decreasing the disease or obesity associated Sutterella, Streptococcaceae, and Erysipelotrichaceae . The experiments show that BP-DF may use as a functional ingredient for preventing obesity, MetS, and intestinal microorganism imbalance. Practical applications Obesity result in many metabolic complications, and it poses a great threat to people's health. Nowadays, the introduction of DF may lead to the development of a new strategy in the treatment of obesity and its metabolic syndrome. Our experiments findings show that BP-DF may use as a functional ingredient for preventing obesity, MetS, and intestinal microorganism imbalance. Therefore, BP-DF can be applied to the development and production of functional food, and can also be used as an important food functional ingredient, which can be added to various food, such as bread, noodles, baked goods, cakes, etc., to improve its nutritional value.
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高影响因子
Environmental Chemistry
·
2020
·Vol. 17
·期 6
·436-444
·
IF 1.91
Hansun Fang,Zhiyou Ling,Fangling Guan,Wei Liao,Faying Lai,Ximei Liang
Environmental context Photodegradation, a natural process for removing pesticides from water, is particularly important in rice fields with their large surface area and sunlight exposure. By studying two commonly used pesticides, we show that the properties of rice field water, such as dissolved organic matter, facilitate indirect photolytic processes while reducing direct photolysis. A better understanding of the natural degradation mechanisms for pesticides will inform their safer use in agriculture. Rice paddy fields (RFs) make ecologically important contributions to agricultural wetland ecosystems in south China. In recent years, the elevated use of pesticides has resulted in concerns over the water quality in RFs and their downstream aquatic environment. Photodegradation is important for the natural elimination of nonpoint source agricultural contaminants, and RF water provides an ideal environment for the photochemical removal of pesticides, owing to its large surface area and photic conditions. Therefore, in this study, the physical and photochemical properties of water collected from the irrigation area were investigated, along with the direct and indirect photodegradation of two commonly used pesticides in RFs, tricyclazole (TC) and pymetrozine (PYM). Results indicated that allochthonous-like dissolved organic matter (DOM) was abundant in the irrigation water, possibly originating from the decomposition of rice straw. Moreover, the light screen effect and the formation rate of singlet oxygen (1O2) and the triplet excited state of DOM (3DOM*) were generally increased in RF water, while the formation of HO• was marginally reduced. Evapoconcentration and photobleaching processes were found to correlate with crop leaf coverage and had a significant impact on the levels and compositions of water constituents. Finally, the photodegradation kinetics of TC and PYM further confirmed that RF water would facilitate indirect photolysis and reduce the direct photolysis of pesticides.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Rong Chen,Bo Liu,Xiaoyang Wang,Kai Chen,Keyu Zhang,Lifang Zhang,Chenzhong Fei,Chunmei Wang,Yingchun Liu,Feiqun Xue,Feng Gu,Mi Wang
Polysaccharide was derived from Pueraria lobata (PPL) which was considered as one of the traditional Chinese medicinal and edible herbs. In the present study, PPL was administered in equal doses (12.5 mg/kg) to both normal mice and antibiotic-associated diarrhea (AAD) mice for two weeks, and was evaluated in terms of body weight, organ indices, gut structure, gut microbiota and short chain fatty acids. The results showed that normal mice treated with PPL not only reduced the isovaleric acid concentration ( P < 0.05), but also significantly increased the abundance of beneficial bacteria, involving Oscillospira and Anaerotruncus ( P < 0.05). In addition, PPL could relieve colonic pathological changes and gut microbiota dysbiosis caused by AAD. It indicated that PPL was a potential functional food ingredient by modulating gut microbiota.
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METABOLIC ENGINEERING
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2020
·
IF 7.263
Lin-Ping Yu,Xu Yan,Xu Zhang,Xiang-Bin Chen,Qiong Wu,Xiao-Ran Jiang,Guo-Qiang Chen
Polyhydroxyalkanoates (PHA) have found widespread medical applications due to their biocompatibility and biodegradability , while further chemical modification requires functional groups on PHA. Halomonas bluephagenesis , a non-model halophilic bacterium serving as a chassis for the Next Generation Industrial Biotechnology (NGIB), was successfully engineered to express heterologous PHA synthase (PhaC) and enoyl coenzyme-A hydratase (PhaJ) from Aeromonas hydrophila 4AK4, along with a deletion of its native phaC gene to synthesize the short chain- co -medium chain-length PHA copolymers , namely poly(3-hydroxybutyrate- co -3-hydroxyhexanoate), poly(3-hydroxybutyrate- co -3-hydroxyhex-5-enoate) and poly(3-hydroxybutyrate- co -3-hydroxyhexanoate- co -3-hydroxyhex-5-enoate). After optimizations of the expression cassette and ribosomal binding site combined with introduction of endogenous acyl-CoA synthetase ( fadD ), the resulting recombinant strain H. bluephagenesis TDR4 achieved a remarkably high 3-hydroxyhexenoate (3HHxE) molar ratio of 35% when grown on glucose and 5-hexenoic acid as co-substrates. The total ratio of side chain consisting of 3HHx and 3HHxE monomers in the terpolymer can approach 44 mol%. H. bluephagenesis TDR4 was grown to a cell dry mass (CDM) of 30 g/L containing approximately 20% poly(3-hydroxybutyrate- co -22.75 mol% 3-hydroxy-5-hexenoate) in a 48-h of open and unsterile fermentation with a 5-hexenoic acid conversion efficiency of 91%. The resulted functional PHA containing 12.5 mol% 3-hydroxy-5-hexenoate exhibits more than 1000% elongation at break. The engineered H. bluephagenesis TDR4 can be used as an experimental platform to produce functional PHA.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10621-10627
·
IF 3.288
Xue Xiong,Meiling Qi
This work presents a novel column fabrication approach for capillary gas chromatography (CGC) through the condensation reaction of a hydroxyl-terminated polymer with a cross-linker inside a capillary column. In this work, polypropylene glycol (PPG 4000) and tris[3-(trimethoxysilyl)propyl]isocyanurate (ICS) were employed to fabricate the PPG-gel capillary column for GC analyses. Inside the column, a 3D cross-linked organogel network forms on the capillary inner surface by condensation of PPG 4000 with ICS under the given mild conditions. As a result, the PPG-gel column exhibited moderate polarity and showed distinctly advantageous resolving performance and inertness for carboxylic acids over the PPG column by the conventional static coating method. Also, it achieved high-resolution separations of the isomer mixtures of alkanes, alkylbenzenes and halobenzenes. Moreover, the PPG-gel column exhibited dramatically improved solvent stability because of its cross-linked organogel network. The organogel column displayed excellent column repeatability and reproducibility with the RSD% values in the range of 0.01–0.04% for run-to-run, 0.71–0.84% for day-to-day and 2.4–3.1% for column-to-column. The proposed organogel approach is facile and applicable to other analogous materials and has a promising future for wide applications.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 31
·14082-14090
·
IF 3.591
Huazi Wang,Qinqin Xu,Jinglong Jiao,Hai Wu
A solidified floating organic drop-dispersive liquid–liquid microextraction (SFOD-DLLME) was established for the extraction of four benzophenone-ultraviolet filters (BP-UV filters) from water samples using a fatty acid deep eutectic solvent (DES) as the extractant. The extracted UV filters were determined by high-performance liquid chromatography with UV detection (HPLC-UVD). In this method, tributyl(dodecyl)phosphonium bromide (P4,4,4,12Br) and sodium decanoate (DecA-Na) were first dissolved in a solution as precursors of DES components. Then they were converted into tributyl(dodecyl)phosphonium tetrafluoroborate (P4,4,4,12BF4) and decanoic acid (DecA) through an anion-exchange reaction and acid–base reaction, respectively. During this period, P4,4,4,12BF4 and DecA formed a DES extraction phase dispersed throughout the solution and the extraction of the analytes was carried out simultaneously. The extraction conditions, including the type and volume of fatty acids, the type and volume of the proton agent, the temperature of the P4,4,4,12Br and NaBF4, solution, salt addition, sample volume and solution pH, were investigated in detail. Under optimal conditions, the method was validated providing correlation coefficients greater than 0.999 for all analytes, limits of detection (LODs) from 0.600 to 1.50 μg L−1, limits of quantification (LOQs) from 2.00 to 5.00 μg L−1, extraction recoveries of 73.1 to 99.8%, intra-day precision from 2.0 to 6.1%, inter-day precision from 3.9 to 7.7%, and enrichment factors from 34 to 42. Finally, the proposed method was applied for the determination of BP-UV filters in different water samples (including tap, river, bottled mineral, bottled vitamin, face-washing and bathing water) with acceptable results.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hongling Fang,Yi Li,Songwei Zhang,Qi Ding,Litian Hu
Ionic liquids (ILs) have recently been demonstrated as a promising lubricating material. However, data on ILs with splendid solubility in non-polar oil and their low-temperature lubricating performances are rarely reported. In this paper, we synthesized four novel oil-miscible protic ionic liquids (PILs) containing different fatty acid anions. They possess low pour point, good low-temperature fluidity, non-corrosiveness and higher thermostability. These PILs were selected as additives in PAO base oil, respectively, and their lubricating performances were tested using a steel ball reciprocating sliding against steel stationary disc at room and low temperatures. At room temperature (~30 ℃), [N888H]C6 with shorter alkyl chains exhibited good lubricating behaviors, both in terms of steady-state friction coefficient and wear volume. However, the lubricating performances of [N888H]OA with longer alkyl chains were relatively poor because the lubricating film formed by it is disordered. At low temperature (-20 ℃), these PIL additives produced excellent antiwear performances, while their friction-reducing properties were unobvious, attributing to the restriction of high kinematic viscosity of PAO base oil.
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FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Yajiao Zhao,Wenli Wei,Li Tang,Dongdong Wang,Yan Wang,Zhengyun Wu,Wenxue Zhang
Sichuan industrial paocai and traditional home-made paocai have different aroma profiles due to different manufacturing techniques, but detailed information about the aroma profiles and aroma-producing microorganism of Sichuan industrial paocai remain largely elusive. For this reason, we established and validated an external standard method of headspace solid-phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC–MS) combined with gas chromatography–olfactometry (GC-O) for identification and accurate quantitation of aroma-active compounds in Sichuan industrial paocai. This method was combined with 16S rRNA amplicon sequencing to comprehensively analyze the aroma and bacteria profiles of Sichuan industrial paocai. A total of 121 volatile compounds were identified, among which 36 odorants were identified as aroma-active compounds with aroma intensities (AIs) ranging from 0.67 to 5.00 by GC-O. The types of aroma-active compounds in Sichuan industrial paocai were variety-specific to some extent, but the aroma-active compounds shared by different varieties of Sichuan industrial paocai (i.e., skeleton aroma-active compounds) were phenylethyl alcohol, acetic acid, butanoic acid, 2-methylbutanoic acid, ethyl hexanoate, 4-ethylphenol and 4-ethylguaiacol. Moreover, 17 key aroma-active compounds of AI > 1 in radish paocai were quantitated by external standard method, and their odor activity values (OAVs) were calculated based on the odor thresholds. Further, 12 aroma-active compounds with OAV ≥ 1 in one of the radish paocai were selected to construct the recombination model, which revealed good agreement with the original sample. Furthermore, Lactobacillus, Pediococcus, Pseudomonas and Sphingomonas were the dominant bacteria in Sichuan industrial paocai. Correlation analysis between 16 dominant bacteria and 36 aroma-active compounds showed that Pediococcus, Arcobacter and Lactobacillus could be the core aroma-producing bacteria of Sichuan industrial paocai.
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JOURNAL OF CEREAL SCIENCE
·
2021
·
IF 3.616
Jinguang Liu,Yuqian Liu,Anqi Wang,Zhen Dai,Rui Wang,Hui Sun,Padraig Strappe,Zhongkai Zhou
Yellowing is associated with the changes in rice quality during storage. This study revealed that the increased yellowness of rice was highly associated with the moisture content of rice during storage. The hysteresis loop formed by sorption and desorption curves showed that the water loss of japonica rice was the largest, suggesting the internal structure of japonica rice was more vulnerable to be damaged. The heat enthalpy of rice increased first, and then decreased during yellowing, indicating the changes in the corresponding rice structure. The changes in the moisture migration were monitored by low-field NMR, and the data showed that the content of tightly bound water decreased during yellowing, and the tightly bound water transferred to higher fluidity in medium moisture content (MMC) and higher moisture content (HMC) sample. The concentration of most esters, ketones and alcohols of rice was increased during yellowing in a lower moisture content (LMC) sample. This study revealed that the yellowing process could inhibit the release of some volatiles for MMC and HMC samples. The increased 1,2-dimethoxy-benzene and phenol in HMC sample during yellowing were the characteristic volatiles for the highest yellowed rice samples. This study may highlight the further understanding of rice yellowing mechanism.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Binbin Zhang,Qi Zhou,Xinwei Zhang,Jiao Ma,Xin Cong,Qin Wang,Yonggui Liao,Yajiang Yang,Hong Wang
In this work, 5,5′,5′′-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)triisophthalate (H 6 L) was used as a gelator to prepare thermostable supramolecular gels (H 6 L gels). The lowest critical gelation concentration of H 6 L was found to be only 0.14 wt%. H 6 L gels remained stable after being placed at 85 °C for 1 h, indicating that its gel-sol phase transition temperature ( T gel ) was not<85 °C. H 6 L gels can be formed in just a few seconds in comparison with the longer gelation time of a conventional thermostable gel. Moreover, a thermostable H 6 L/Fe 3+ gel was also prepared by the coordination interactions of H 6 L and Fe 3+ ions. The studies of FT-IR, UV–vis, XRD and SEM reveal that multiple hydrogen bonds, π-π interactions as well as coordination interactions were the main driving forces for the formation of thermostable three-dimensional network structure of H 6 L gels. In addition, the fluorescence spectra of H 6 L gels showed that the dual emission at 396 nm and 469 nm was derived from the structure of melamine and 5-aminoisophthalic acid contained in H 6 L structure. The gel formed at high temperature had relatively high transparency and strong fluorescence signal, and the fluorescence intensity is affected by the external H + concentration. Using this characteristic, 14 organic acids can be effectively identified with the help of principal component analysis (PCA). L-cysteine can be identified with the naked eye by the color and state changes of H 6 L/Fe 3+ gels.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Chen Liu,Ping Yang,Haili Wang,Huanlu Song
Yogurt is widely acknowledged as a healthy dairy product with unique aroma. However, the changes in the odor compounds often affect the storage and shelf life of yogurt. Besides, the complex colloidal system and low concentration levels of most of odorants make it more difficult to be analyzed. Therefore, this study extracted the odor compounds of yogurt through four extraction methods, including dynamic headspace sampling (DHS), solid phase micro-extraction (SPME), solvent-assisted flavor evaporation (SAFE), and Stir bar sorptive extraction (SBSE). A total of 117 odorants, including 27 esters, 27 alcohols, 22 ketones, 16 acids, 15 aldehydes, 5 sulfides, and 5 other compounds, were identified. Of which, 31 odor-active compounds were perceived, and 12 compounds were smelled for the first time in yogurt. Of the four methods, DHS showed the most outstanding extraction effect by obtaining 88 odor compounds. Around 13 volatiles were characterized as the key odor-active compounds of yogurt. Similarly, acetophenone and butyl acrylate were detected as the key odor-active compounds of yogurt for the first time. 2,3-Butanedione was the vital odor-active compound with the highest flavor dilution (FD) factor in yogurt. The results concluded that the odor-active compounds in yogurt might have synergistic and masking effects between them.
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高影响因子
危险品化学品经营许可证（带存储）