RSC Advances
·
2017
·Vol. 7
·期 21
·12518-12523
·
IF 3.108
Pengfei Zhou,Xuping Wang,Bo Yang,Frank Hollmann,Yonghua Wang
Epoxides are important synthetic intermediates for the synthesis of a broad range of industrial products. This study presents a promising solution to the current limitation of enzyme instability. By using simple deep eutectic solvents such as choline chloride/sorbitol, significant stabilization of the biocatalyst has been achieved leading to more robust reactions while using environmentally more acceptable solvents as compared to ionic liquids.
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Journal of Energy Chemistry
·
2016
·
IF 2.322
Ran An,Guizhuan Xu,Chun Chang,Jing Bai,Shuqi Fang
Butyl levulinate (BL) is a promising new candidate as diesel fuel and fuel additive. In this study, an efficient process for a one-pot synthesis of BL from biomass-derived carbohydrates in butanol medium with the catalysis of metal sulfates was developed. The catalytic activity of a series of metal sulfates for the synthesis of BL from fructose was investigated. Among various metal sulfates, ferric sulfate Fe 2 (SO 4 ) 3 was found to be the most efficient catalyst, which gave a remarkably high BL yield of 62.8 mol% under the conditions of 463 K, 3 h, a catalyst dosage of 5.0 g/L, and fructose concentration of 25 g/L. Different carbohydrates including glucose, cellulose , inulin and sucrose were also used for one-pot synthesis of BL with the catalysis of Fe 2 (SO 4 ) 3 , showing the yields of 39.6, 30.5, 56.6 and 50.1 mol%, respectively. In addition, the recycling and reuse of Fe 2 (SO 4 ) 3 was studied by characterizing them using powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS). A plausible reaction pathway for the one-pot synthesis of BL from fructose was proposed. This study provides a facile and feasible way for the synthesis of BL from biomass.
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RSC Advances
·
2017
·Vol. 7
·期 10
·5621-5627
·
IF 3.108
Shan Huang,Kai-Li Yang,Xiao-Fang Liu,Hu Pan,Heng Zhang,Song Yang
MIL-100(Fe) was used for the first time in the catalytic transformation of hexose sugars into lactic acid (LA). The as-synthesized MIL-100(Fe) was systematically characterized, and its superior morphological and textural properties were demonstrated to contribute greatly to the pronounced catalytic performance in fructose-to-LA conversion (up to 32% yield), as compared with other catalysts like Cu-BTC and MIL-100(Cr). The effects of reaction conditions including temperature, reaction time, and substrate loading were explored. In addition, MIL-100(Fe) could be easily reused for 4 cycles with no evident decrease in catalytic activity.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Yanxiu Liu,Hu Li,Jian He,Wenfeng Zhao,Tingting Yang,Song Yang
A series of niobium-containing catalysts were prepared by hydrothermal synthesis method, and characterized by NH 3 -TPD, TEM, XRD, N 2 adsorption-desorption and pyridine-adsorption FT-IR techniques. Fe-NbP (Fe-doped niobium phosphate) with higher total acid density (3.59 mmol/g) and appropriate Brønsted/Lewis acid ratio (1.32) was found to show superior activity in production of levulinic acid (LA) from glucose, and a high LA yield of 64.2% was achieved at 180 °C in 3.0 h. The effect of various reaction parameters such as temperature, time, catalyst dosage, and substrate concentration on LA production has been investigated. The catalyst can be recycled for several times without significant loss of activity.
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 10
·8459-8464
·
IF 3.277
Qianqian Du,Fei Qu,Beibei Mao,Shuyun Zhu,Jinmao You
An efficient sensor was developed for highly sensitive and selective determination of melamine based on Ag nanoclusters (Ag NCs) capped by hyperbranched polyethyleneimine (PEI) molecules with different molecular weights. The fluorescence of the Ag NCs could be quenched by Hg2+ and recovered by melamine. The molecular weights of PEI had an appreciable effect on the sensitivity, and Ag NCs capped by PEI with a molecular weight of 600 were more sensitive; the linear range of melamine was from 0.1 to 30 μM with a detection limit 30 nM. Moreover, this Ag NCs–Hg2+ system displayed excellent selectivity over common interferences such as metal ions, amino acids, sugars and nitrogen-containing organic molecules. Benefiting from the high selectivity, good recoveries ranging from 96% to 101% were obtained in food samples, including milk, infant formula, and dog food. More importantly, Ag NC-doped agarose hydrogels were fabricated easily to construct a visual device for the detection of melamine in food samples.
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WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 9
·1-11
·
IF 1.551
Wu Hailu,Xu Kaiqin,He Xiaojuan,Wang Xinze
Three macrophyte species, Typha augustifolia ( T. augustifolia ), Phragmites australis ( P. australis ), and Acorus calamus L. ( A. calamus L.), have been grown in hydroponic cultivation systems fed with synthetic wastewater. The experiment was designed as 3 × 2 factorial, with three species and two ratios of NH 4
+ /NO 3
− so as to investigate the nitrogen transformation and nitrogen removal capacity of each species. The nitrogen removal mechanism was further disclosed by comparing biomass production, nitrogen mass balance, and root exudates of the three plant species under different NH 4
+ /NO 3
− ratios. The results indicated there exists a linear relationship, with positive significance ( r = 0.946, p < 0.05), between plant biomass and total nitrogen (TN) removal efficiency; in other words, biomass could best reflect plant ability to remove nitrogen. It is also found that NH 4
+ /NO 3
− ratio could influence plant biomass and root exudates significantly. Additionally, the hydrogen donor and source of energy in denitrification happened in this research were mainly organic acids and soluble sugars, accounting for approximately 50 % of the composition in root exudates.
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FOOD CHEMISTRY
·
2017
·
IF 4.529
Yao Huang,Fang Feng,Zhi-Gang Chen,Tao Wu,Zi-Han Wang
Natural deep eutectic solvents (NADESs) constitute a novel class of biodegradable and inexpensive solvents. In this study, twenty choline chloride- and glycerol-based NADESs were prepared and investigated as washing agents in the removal of cadmium (Cd) from rice flour for the first time. Choline chloride-based NADESs demonstrated good Cd removal (51%–96%). A natural, biodegradable surfactant, saponin, was mixed with the NADESs to enhance their efficiency. No increase in Cd removal was observed when glycerol-based NADESs were combined with 1% saponin; however, synergistic effects between saponin and choline chloride-based NADESs were observed during the washing process and >99% Cd was removed using NADES-saponin mixtures. Moreover, NADESs washing process did not affect the main chemical components or structure of rice flour. The mechanism of Cd removal by NADESs and regeneration of Cd-contaminated NADESs were also explored. The study presents a green and efficient way of removing Cd from contaminated rice.
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PubMed
高影响因子
Catalysts
·
2017
·Vol. 7
·期 6
·182
·
IF 3.082
Xin Yu,Xueying Gao,Ruili Tao,Lincai Peng
The use of common metal salts as catalysts for 5-ethoxymethylfurfural (EMF) synthesis from carbohydrate transformation was performed. Initial screening suggested AlCl3as an efficient catalyst for EMF synthesis (45.0%) from fructose at 140 °C. Interestingly, CuSO4and Fe2(SO4)3were found to yield comparable EMF at lower temperature of 110 to 120 °C, and high yields of ethyl levulinate (65.4–71.8%) were obtained at 150 °C. However, these sulfate salts were inactive in EMF synthesis from glucose and the major product was ethyl glucoside with around 80% yield, whereas EMF of 15.2% yield could be produced from glucose using CrCl3. The conversion of sucrose followed the accumulation of the reaction pathways of fructose and glucose, and a moderate yield of EMF could be achieved.Keywords:carbohydrate;5-ethoxymethylfurfural;catalytic conversion;metal salt;Lewis acid
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FOOD CHEMISTRY
·
2016
·
IF 4.052
Yao Huang,Fang Feng,Jie Jiang,Ying Qiao,Tao Wu,Josef Voglmeir,Zhi-Gang Chen
In this study, an efficient extraction technique using a combination of ultrasound and natural deep eutectic solvents (NADESs) was developed. Some basic physical properties, including viscosity, polarity, and solubility, of thirteen NADESs prepared from natural components were investigated systematically. Results show that the solubility of rutin increased in choline chloride- and glycerol-based NADESs by 660–1577 times compared to water. NADESs with high rutin extractability can be designed by combining NADESs components. A maximum of 9.5 mg/g rutin was extracted from tartary buckwheat hull with extraction efficiencies of 95%. NADESs can be recovered and recycled. In addition, the biocompatibility and biodegradability of the tested NADESs were also evaluated. The results demonstrated that these NADESs were excellent solvents with extremely low toxicities and favorable biodegradabilities. Our findings suggest that NADESs can be used as green solvents for the extraction of bioactive ingredients.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zhiyong Li,Zhenzhen Wang,Hui Wang,Yunlei Shi,Yang Zhao,Huiyong Wang
Furan compounds, such as furfural (Fur) and 5-hydroxymethylfurfural (5-HMF), are significant platform molecules from biomass. They have high boiling points and coexist with raw carbohydrates in aqueous solutions. This makes their efficient adsorption and selective separation a critical challenge in sustainable biorefinery processes. This study focuses on synthesizing amino-functionalized MOFs by grafting amino silanes onto UiO-67 to achieve the efficient adsorption and selective separation of 5-HMF or Fur from aqueous solutions. The optimized adsorbent UiO-67-2AS(10) exhibits a remarkable adsorption capacity for 5-HMF (1530 mg/g) and Fur at room temperature (1267 mg/g). Under optimal conditions, the extraction efficiencies are 12% for 5-HMF and 19% for Fur. Additionally, UiO-67-2AS(10) does not exhibit a clear affinity toward sugars (sucrose, xylose, and fructose) in water, enabling selective separation of furan compounds from reducing sugars. The adsorption process is accurately described by both the Langmuir model and the pseudo-second-order kinetic model. UiO-67-2AS(10) exhibits remarkable adsorption performance due to the π–π interactions and hydrogen bonding interactions with the furan compound.
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ANALYTICAL LETTERS
·
2025
·
IF 1.8
Wanying Zhao,Yanqin Chen,Jun Tan,Yanru Bai,Fudong Ma
A method utilizing high-performance liquid chromatography with evaporative light scattering detection (HPLC-ELSD) has been developed and validated for the simultaneous determination of raffinose, glucose, sucrose, and stachyose in waste liquid from cottonseed processing and in byproducts including cottonseed meal. The separation was performed using a carbohydrate ES column (250 × 4.6 mm, 5 μm) and isocratic elution with acetonitrile and water (70:30, v/v). The temperature of the column oven was maintained at 35 °C. The drift tube temperature for evaporative light scattering detection (ELSD) was operated 40 °C, while the nitrogen flow was set to 1.5 L·min−1. The saccharides were separated by HPLC-ELSD within 20 min. The coefficients of determination (R2 = 0.9986–0.9999) indicate that there was a linear relationship between saccharides and the response. The limits of detection were 0.004–0.023 mg·mL−1 and the quantification range was from 0.013 to 0.080 mg·mL−1. The intraday and interday precision were from 0.05 to 0.55% and 0.20 to 0.58%, respectively. The recovery was from 102.75 ± 2.03% to 106.76 ± 2.09% and the relative standard deviations were 1.87 to 1.98%. The method exhibited good stability in determining four saccharides in cottonseed processing waste liquid and the resultant byproduct cottonseed meal. This method exhibits high separation efficiency and sensitivity, excellent precision, and simplicity, which allows determination of the high value-added product, raffinose, in cottonseed processing waste liquid and meal.
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Food Science and Human Wellness
·
2024
·
IF 5.6
Yuan Yuan,Shun Zhong,Zeyuan Deng,Guangyan Li,Jinwu Zhang,Hongyan Li
The nutrient digestion, absorption and biological activity of bee pollen may be limited due to the complex pollen wall. Here, the effect of superfine grinding technology on the release of nutrients from bee pollen were investigated, and their antioxidant activities and in vitro digestion were explored in this study. Results showed that the content of nutrients in bee pollen increased after wall disruption. Among them, fat content increased by 22.55 %–8.31 %, protein content increased by 0.54 %–4.91 %, starch content increased by 36.31 %–48.64 %, soluble sugar content increased by 20.57 %–29.67 %, total phenolic acid content increased by 11.73 %–86.98 % and total flavonoids content increased by 14.29 %–24.79 %. At the same time, the antioxidant activity increased by 14.84 %–46.00 %. Furthermore, the active components such as phenolic compounds in the wall-disruption bee pollen were more readily to be released during the in vitro digestion, and easier to be absorbed because of their higher bioaccessibility. Antioxidant activities during in vitro digestion were also improved in wall-disruption bee pollen. These findings provide evidence that bee pollen wall disruption was suggested, thus, it is more conducive to exerting the value of bee pollen in functional foods.
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