JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Zixuan Wang,Zixian Xu,Xinyu Xu,Ao Yang,Weiping Luo,Yizhan Luo
The solubility of benzoic acid in 1,2-ethanediol, 3,6-dioxa-1-decanol, octane, 3-oxa-1,5-pentanediol, N,N-dimethylacetamide, 1,4-dimethylbenzene, 1,3-dimethylbenzene, 1,2-dimethylbenzene, propanoic acid, cyclohexanone, decahydronaphthalene, thiacyclopentane dioxide were measured by the laser dynamic method. The experimental temperature ranged from 286.15 K to 354.15 K. The results show that within the temperature range studied, the solubility of benzoic acid would increase with the gradually increasing of temperature. Meanwhile, three thermodynamic models (Apelblat model, λh model, the modified non-random two liquid (NRTL) activity coefficient model) were used to correlate the experimental data, and the calculated solubility agreed satisfactorily with the measured results. The result of Akaike Information Criterion ( AIC ) analysis showed that the Apelblat model was the best model to correlate the solubility of benzoic acid in N,N-dimethylacetamide, the λh model was the best model to correlate the solubility of benzoic acid in octane, and the modified NRTL model was the best model to correlate the solubility of benzoic acid in 1,2-ethanediol, 3,6-dioxa-1-decanol, 3-oxa-1,5-pentanediol, 1,4-dimethylbenzene, 1,3-dimethylbenzene, 1,2-dimethylbenzene, propanoic acid, cyclohexanone, decahydronaphthalene and thiacyclopentane dioxide. Furthermore, the thermodynamic functions (dissolution enthalpy, entropy, Gibbs energy) were obtained from the SLE data by using the van't Hoff equation.
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JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2020
·Vol. 58
·期 2
·532-540
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IF 1.946
Xing Li,Miao Yelian,Li Na,Jiang Ling,Chen Jie Yu
One water-soluble polysaccharide (WDOP) and three alkali-soluble polysaccharides (ADOP1, ADOP2 and ADOP3) were successfully obtained from Dendrobium officinale . Molecular structure of the polysaccharides was analyzed, and in vitro lactic acid fermentation of the polysaccharides by lactic acid bacteria (LAB) and bifidobacteria was performed. All the polysaccharides exerted proliferative effect on the LAB and bifidobacteria. ADOP2 was the most effective one, followed by WDOP. This could be attributed to their molecular structure features, such as a high level of total sugar, uronic acid and reducing sugar, an abundance of glucose and mannose, and a low and middle weight-average molecular weight. ADOP2 and WDOP produced more short-chain fatty acids (SCFAs) than ADOP1 and ADOP3 did during lactic acid fermentation. Propionic and acetic acids were the main SCFAs produced. These findings are useful for understanding the structure–activity relationship of D. officinale polysaccharides in lactic acid fermentation, and for developing new functional foods and beverages from D. officinale .
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FUEL
·
2020
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IF 5.578
Qilong Xie,Dekui Sun,Ming Xia,Litao Jia,Huaiqian Lu,Hui Shi,Bo Hou,Debao Li
A method prior to using high-performance liquid chromatography (HPLC), named phase transfer catalyst-assisted reversed-phase dispersive liquid–liquid microextraction (PTC-RP-DLLME), was developed for the rapid determination of organic acids in Fischer-Tropsch synthesis (FTS) oil products. This method used sodium hydroxide solution and tetrabutylammonium bromide (TBAB) as an extractant and a disperser respectively, in which the TBAB promoted the dispersion of aqueous NaOH solutions in the organic product, and acted as a hydrogen bond receptor to enhance the extraction of organic acids via hydrogen bond interactions. Under the optimized conditions, the calibration curves in the range of 0.1–30 μg mL −1 showed correlation coefficients (r) of 0.998–0.999. Detection limits (S/N = 3) were ranged from 1.0 to 3.5 ng mL −1 . The relative standard deviations of intra-day and inter-day repeatability were in the range of 2.9–5.8 % and 4.1–6.7%, respectively. The recoveries ranged from 85.4% to 105.9%. This developed method was employed for the analysis of organic acids in 6 types of oil products. This work provides an efficient and rapid pretreatment method for acid concentration prior to HPLC, and therefore saves time and cost for the quantitative analysis of FTS oil products. Moreover, precise analysis by application of this method is fairly beneficial to the FT catalyst improvement and industrial equipment material selection, and is rather significant for the proper design of the downstream processing/purification system.
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Chemical Engineering and Processing-Process Intensification
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2020
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IF 3.731
Zhiming Wu,Qian Zeng,Hongye Cheng,Lifang Chen,Zhiwen Qi
Separation of components of light cycle oil (LCO) into aromatic-rich and nonaromatic-rich fractions is the essential step for upgrading LCO to produce benzene, toluene, xylene enriched fraction, and high-quality diesel. In this work, extractive separation of model LCO which contains 70 wt% tetralin and 30 wt% dodecane was performed using deep eutectic solvent (DES) as the extractant and water as the anti-extractant. Tetrabutylphosphonium bromide (TBPB) and levulic acid (LA) at a molar ratio of 1:4 was determined as the extractant, due to its high and stable performance during extraction and regeneration processes. The liquid-liquid equilibrium data of ternary systems involving TBPB:LA(1:4) were then experimentally determined and fitted using non-random two-liquid model. The continuous extraction process was simulated and optimized, high mass purity (0.980 for tetralin and 0.987 for dodecane) and high recovery ratio (0.994 for tetralin and 0.954 for dodecane) were achieved.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 100
·期 6
·2554-2567
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IF 2.614
Shasha Wang,Guangjing Chen,Kewei Chen,Jianquan Kan
BACKGROUND Carapax Trionycis is the shell of the soft-shelled turtle. It is rich in minerals, amino acid, peptides, and other nutrients. Current processing and consumption of soft-shelled turtle leads to the waste of huge quantities of Carapax Trionycis in the form of spent materials. In this study, the bioavailability, prebiotic activity, and physicochemical properties of Carapax Trionycis using different processing methods were investigated. The vinegar-quenched Carapax Trionycis (V-CT), fine powders (D0.18, D0.10), and superfine powders (D0.05, D0.025) of Carapax Trionycis were prepared by the vinegar-quenching method, common grinding, and the superfine grinding method. RESULTS The average particle sizes of D0.18, D0.10, D0.05, and D0.025 were 147.82, 77.35, 36.65, and 2.24 μm, respectively. Superfine grinding changed the surface morphology of Carapax Trionycis and promoted the release of active ingredients. D0.025 had the highest polypeptide (8.15%), polysaccharide (1.21%), total free amino acid (232.36 mg 100 g −1 ) and water-soluble extract content (10.74%), and showed the highest calcium release rate (55.64%) after in vitro digestion. The apparent permeability (P APP ) of the resulting Carapax Trionycis samples in the dialysis tubing model and the everted intestinal sac model increased significantly with the decrease in the Carapax Trionycis particle sizes. Furthermore, the five Carapax Trionycis samples significantly stimulated the growth of the tested probiotics and increased lactic acids production after 48 h fermentation compared to the control. The Carapax Trionycis powder prepared by superfine grinding displayed better prebiotic activity than other samples as it significantly induced a greater proliferation of probiotic bacteria and higher production of lactic acid, as well as greater release of free calcium. CONCLUSIONS The results showed that Carapax Trionycis superfine powder D0.025 had the highest active ingredient content, calcium bioavailability, and prebiotic activity. Our approach of developing Carapax Trionycis superfine powder as natural calcium supplement or potential prebiotic would therefore broaden the scope of soft-shelled turtle processing waste utilization in an eco-friendly, cost-effective, and sustainable approach in the future. © 2020 Society of Chemical Industry
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CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Xiao Zhang,Jude Juventus Aweya,Zong-Xun Huang,Zhuo-Ying Kang,Zi-Hao Bai,Kun-Huan Li,Xiao-Tong He,Yang Liu,Xian-Qiang Chen,Kit-Leong Cheong
The fermentation behaviour of sulfated polysaccharides (GLP) and their agaro-oligosaccharides (GLO) derived from Gracilaria lemaneiformis were examined. During in vitro fermentation, GLP and GLO increased the concentrations of short chain fatty acids (SCFAs) and modulated the composition and diversity of gut microorganisms compared with control groups. GLP increased the abundance of Bacteroidetes and decreased the abundance of Firmicutes, while GLO increased the abundance of Firmicutes and Actinobacteria. Moreover, the abundances of potential pathogenic bacteria were reduced. Molecular weight and intrinsic viscosity of GLP decreased significantly from 2.15 × 10 5 to 1.22 × 10 5 Da, 374.45–113.91 mL/g, respectively. Furthermore, GLP was degraded into smaller degree of polymerization of oligosaccharides, with no significant change observed in GLO. Overall, this study revealed GLP and GLO could be beneficial for gastrointestinal tract by producing SCFAs and modulating intestinal microbes, indicating GLP and GLO are potentially sources of prebiotics in functional foods.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Miao Yao,Shaohui Liu,Chen Huang,Jun Nie,Yong He
Five ester derivatives from hydroxyalkyl of 2-hydroxy-2-methyl-1-phenyl propanone, one of the most successfully applied α-hydroxyalkyl acetophenone photoinitiators, are synthesized. From the spectroscopy results and theory calculation, it is proved that the much lower photocleavage rates of the directly linked unsaturated ester derivatives are due to that the strong electron withdrawing effect of carbonyl increase the bond strength between the benzoyl and quaternary carbon and the effective energy transfer from benzoyl to double bond because of the existence of p-σ-π hyperconjugation, which consequently decreased their initiating ability. Excitingly, simple introduction of two-methylene spacer between the carbonyl and alkoxyl can effectively block the hyperconjugation and significantly increase the photocleavage rate up to the same level of their mother commercial photoinitiator, which can open a gate for design of new high efficiency and polymerizable type I photoinitiators.
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APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Chenhao Sun,Fangqin Li,Jianxing Ren,Jiang Wu,Guanjun Wang,Linfeng Chen
Exploring low-cost and earth-abundant photocatalysts to efficiently release H 2 from wastewater is an appealing solution for global energy and environmental issues. Here, we successfully prepared flower-like 1T/2H-MoS 2 -decorated g-C 3 N 4 (thiourea)/g-C 3 N 4 (urea) (denoted as CNT/CNU) isotype heterojunction photocatalysts via a facile ultrasonic dispersion method and researched the photocatalytic H 2 generation and pollutant degradation performance in oxalic acid (OA) simulated wastewater. The results displayed that 20% 1T/2H-MoS 2 @CNT/CNU sample exhibited the highest photoreactivity, and the H 2 release rate was 1563.32 μmolg -1 h −1 , which was about 96 times higher than the CNT/CNU. Meanwhile, it also showed the highest total organic carbon (TOC) removal rate of 67.5%. The increased photoreactivity of nanocomposites can be ascribed to the double-interface system to effectually improve the separation of photoinduced charges. Additionally, the experimental results further confirmed that the loading of flower-like 1T/2H-MoS 2 could provide abundant active sites as well as expand the visible-light absorption range. Significantly, photoelectrochemistry measurements and density functional theory (DFT) calculations also confirmed that 1T/2H-MoS 2 cocatalysts accelerated the charge migration. On this basis, the mechanism of 1T/2H-MoS 2 @CNT/CNU promoting hydrogen production and synergistic OA degradation was proposed. This research presents a prospective idea for the utilization of waste water and the simultaneous production of clean energy.
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2021
·Vol. 57
·期 1
·92-100
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IF 3.713
Wei Wang,Lijun Fan,Xuewen Li,Zirong Wang,Jianzhong Zhou,Buligen Jialengbieke,Jianye Ren,Xiaodong Hu
In this study, the digestion of pectic polysaccharide from Brassica rapa L. (BRP) in vitro and its effect on the intestinal microbiota in cyclophosphamide (Cy)-treated mice were investigated. As a result, the molecular weight ( M w ) of BRP was significantly decreased after simulated gastrointestinal digestion, and content of reducing sugars ( C R ) was significantly increased ( P < 0.05), implying that BRP was gradually degraded under gastrointestinal digestion conditions in vitro . In vivo , both 50 or 200 mg kg −1 ·BW/d of BRP significantly improved SCFAs concentrations that decreased by Cy treatment ( P < 0.05). Meanwhile, BRP enriched the alpha-diversity of intestinal microbiota and altered the microbial composition with an increase of Lactobacillus and a decrease of Clostridium, Ruminococcus, Oscillospira ( P < 0.05). Besides, BRP intervention was conducive to the recovery of mouse body weight, thymus and spleen indices, and contributed to improve the intestinal barrier.
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MOLECULAR NUTRITION & FOOD RESEARCH
·
2021
·Vol. 65
·期 16
·2100146
·
IF 5.82
Yanqiu Chen,Mei Wan,Yi Zhong,Tingfang Gao,Yuehan Zhang,Fen Yan,Da Huang,Yuanzi Wu,Zuquan Weng
Scope Depression is the leading cause of disability around the world; however, most antidepressants have drug tolerance and serious side effects. In this study, it is explored whether partially hydrolyzed guar gum (PHGG) is a safe food that exhibits protection in a mouse model of depression. Methods and Results PHGG is orally administered to mice with depression induced by chronic unpredictable mild stress (CUMS) in two animal experiments (prevention trial and intervention trial) to characterize the potentially protective effect of PHGG. The results in the prevention trial show that PHGG significantly inhibits the loss of body weight, and prevents CUMS-induced depressive-like behavior in mice. The beneficial effects may be associated with PHGG modulating the gut microbiota structure and then increasing the levels of short-chain fatty acids in mice feces and the levels of 5-hydroxytryptamine and dopamine in serum, striatum, and hippocampus. Besides, PHGG in the intervention trial is less effective than that in the prevention trial, but it may have a synergistic effect on improving depression with fluoxetine. Conclusions This study suggests that moderate daily intake of PHGG can contribute to relieving depressive-like behavior.
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Food & Function
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2021
·Vol. 12
·期 18
·8635-8646
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IF 5.396
Xu-Ting Xie,Li-Xin Zheng,Hui-Min Duan,Yang Liu,Xian-Qiang Chen,Kit-Leong Cheong
Ulcerative colitis (UC) is a chronic lifetime disorder with a high incidence worldwide. A functional food-based method to prevent UC would be a good option for disease control. G. lemaneiformis oligosaccharides (GLOs) should have potent benefits for the gastrointestinal tract, based on in vitro fermentation assessed in our previous study. This study evaluated the therapeutic potential of GLOs in UC, as well as their possible mechanisms of action. The administration of GLOs was able to reduce the severity of dextran sulphate sodium-induced colitis by protecting mice from weight loss, reductions in colon length, inflammatory infiltration, and colon damage. Gut microbiota composition analysis showed that at the phylum level, GLOs could restore the composition of Bacteroidetes and decrease the level of Firmicutes. Consistently, it increased the contents of beneficial microbial metabolites and short-chain fatty acids in the mouse colitis model. In conclusion, GLOs could comprise a promising functional food strategy to alleviate UC symptoms.
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Marine Drugs
·
2021
·Vol. 19
·期 8
·456
·
IF 5.118
Xing-Wei Xiang,Hui-Zhen Zheng,Rui Wang,Hui Chen,Jin-Xing Xiao,Bin Zheng,Shu-Lai Liu,Yu-Ting Ding
The intestinal flora is recognized as a significant contributor to the immune system. In this research, the protective effects of oyster peptides on immune regulation and intestinal microbiota were investigated in mice treated with cyclophosphamide. The results showed that oyster peptides restored the indexes of thymus, spleen and liver, stimulated cytokines secretion and promoted the relative mRNA levels of Th1/Th2 cytokines (IL-2, IFN-γ, IL-4 and IL-10). The mRNA levels of Occludin, Claudin-1, ZO-1, and Mucin-2 were up-regulated, and the NF-κB signaling pathway was also activated after oyster peptides administration. Furthermore, oyster peptides treatment reduced the proportion ofFirmicutes/Bacteroidetes, increased the relative abundance ofAlistipes,Lactobacillus,Rikenelland the content of short-chain fatty acids, and reversed the composition of intestinal microflora similar to that of normal mice. In conclusion, oyster peptides effectively ameliorated cyclophosphamide-induced intestinal damage and modified gut microbiota structure in mice, and might be utilized as a beneficial ingredient in functional foods for immune regulation.Keywords:oyster (Crassostrea gigas);peptides;cyclophosphamide;immunomodulatory;gut microbiota;short-chain fatty acid
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