Green solvents for cellulose dissolution is a key topic for green chemistry,especially natural cellulose with high molecular weight,and there are scarce solvents reported.Deep eutectic solvent(DES)is a typical kind of...Green solvents for cellulose dissolution is a key topic for green chemistry,especially natural cellulose with high molecular weight,and there are scarce solvents reported.Deep eutectic solvent(DES)is a typical kind of green solvent that has been attracted much attention recently.Here,high molecular weight natural cellulose(DP>3000)was first isolated from wheat straw and then be directly dissolved in the choline/L-lysine(Ch/Lys)DES.The solution owns excellent stability,and the solubility reaches^5%.Rheological studies revealed that the natural cellulose can be well dispersed in the DES solution and showed gelation at high concentrations.The dissolved cellulose can be regenerated when the dilute acid aqueous solution was added into the solution.It provides an energy conversation and an environmentally friendly route to prepare a cellulose solution,which makes it possible to convert cellulose to valuable chemicals and materials in its homogeneous solution.展开更多
Herein,the synthesis and characterization methods of natural deep eutectic solvents based on monoterpenoids have been presented.Low viscous fluids with suitable physicochemical properties are produced.The materials ar...Herein,the synthesis and characterization methods of natural deep eutectic solvents based on monoterpenoids have been presented.Low viscous fluids with suitable physicochemical properties are produced.The materials are non-toxic,biodegradable,and cost-effective.Thus,they can be used to develop sustainable solvents for various processes and can find their applications in various fields.A theoretical study based on quantum chemistry and classical molecular dynamics is used for the nanoscopic characterization of structure,dynamics,and hydrogen bonding.The reported results help analyze the properties of this new family of solvents.The required information for developing structure–property relationships for proper solvent design to form a sustainable chemistry framework is obtained.展开更多
植物提取物是畜禽饲料添加剂的重要组成部分,在畜禽养殖中起到抗氧化、抗炎、抗应激和提高生产性能的作用。目前植物提取物的制备多采用常规的有机溶剂(乙醇、氯仿和乙酸乙酯)提取,有机溶剂的易燃、易挥发和毒性会对提取人员造成伤害,...植物提取物是畜禽饲料添加剂的重要组成部分,在畜禽养殖中起到抗氧化、抗炎、抗应激和提高生产性能的作用。目前植物提取物的制备多采用常规的有机溶剂(乙醇、氯仿和乙酸乙酯)提取,有机溶剂的易燃、易挥发和毒性会对提取人员造成伤害,提取后的废液会造成环境的污染。天然低共熔溶剂(natural deep eutectic solvents, NADESs)是一种以初级代谢产物等天然成分为原料的新型绿色提取溶剂,具有制备简单、低毒或无毒、价廉易得、可生物降解、可回收利用等优点,是未来替代传统有机提取溶剂的新型溶剂,已广泛应用到化工、食品、中药提取等技术领域。文章综述了天然低共熔溶剂在植物提取物中的最新应用进展,旨在为天然低共熔溶剂的推广和应用提供指导。展开更多
A novel analytical procedure for the determination of gold by electrothermal atomic absorption spectrometry combined with selective liquid-liquid extraction by natural deep eutectic solvents(NADESs)is presented.The ex...A novel analytical procedure for the determination of gold by electrothermal atomic absorption spectrometry combined with selective liquid-liquid extraction by natural deep eutectic solvents(NADESs)is presented.The extraction ability of the NADESs prepared using menthol,thymol and camphor toward gold in hydrochloric acid solutions was studied.The extraction efficiency was improved by optimizing the parameters including the composition of the NADES s,the volume ratio of organic and aqueous phases,kinetics,and acidity of the solution.Quantitative determination of gold was carried out by electrothermal atomic absorption spectrometry directly in the NADES s phase dissolved in isopropyl alcohol.The extraction recovery of gold from 1 mol/L HCl with the NADESs based on menthol and camphor mixed in a molar ratio 1:1 was 99.7%at an enrichment factor of 100.The limits of detection and quantification of the proposed procedure were 1μg/L and 3.3μg/L,respectively,with a relative standard deviation of less than 5%.The developed procedure was applied for determination of gold in the certified reference material of ore,environmental and waste waters.展开更多
Due to environmental protection requirements,extraction of bioactive compounds from plant materials using environment-friendly green solvents has always been a research hotspot.And great efforts of scholars have been ...Due to environmental protection requirements,extraction of bioactive compounds from plant materials using environment-friendly green solvents has always been a research hotspot.And great efforts of scholars have been made in this direction,as well as environment-friendly solvents have been used to develop many innovative extraction techniques.Ionic liquids(ILs)and deep eutectic solvents(DESs)are two kinds of typical designable green solvents,which are potential replacements for traditional volatile organic solvents used for extracting.Under the substances action of inorganic salts or polymers,ILs/DESs can form an aqueous two-phase system(ATPS),which has obvious advantages for separating natural products.This paper discussed the phase separation principle of ILs/DESs-based ATPSs and reviewed the applications in the extraction of natural active molecules in recent years,as well as to promote the development of separation of the active constituents in Chinese materia medica.展开更多
目的:采用天然低共熔溶剂(Natural deep eutectic solvents,NADES)提取米糠酯酶并优化提取工艺参数,纯化米糠酯酶获得高纯度米糠酯酶,并探究其酶学特性。方法:合成了10种不同的NADES、选用了水浴搅拌和超声两种处理方式进行筛选,然后对...目的:采用天然低共熔溶剂(Natural deep eutectic solvents,NADES)提取米糠酯酶并优化提取工艺参数,纯化米糠酯酶获得高纯度米糠酯酶,并探究其酶学特性。方法:合成了10种不同的NADES、选用了水浴搅拌和超声两种处理方式进行筛选,然后对提取效果最佳的NADES和方法进行单因素和响应面优化,参数包括料液比、含水量、提取温度和提取时间;将最优提取工艺得到的粗酶液通过阴离子交换树脂DEAE纯化,然后进行酶学性质的探究。结果:最佳提取米糠酯酶的工艺为在含有5%水分的脯氨酸-甘油(摩尔比1:2)溶剂体系中,水浴搅拌3.0 h,温度74.0℃,米糠和溶剂料液比为9:30,此时米糠酯酶活力为2.96 U。通过阴离子交换树脂DEAE纯化,获得了纯度较高的米糠酯酶,纯化倍数为1.74倍,回收率为69.40%,分子量约为35 kDa,对硝基苯酚乙酯为最适底物,最适温度和pH分别是40.0℃、pH8.0,在30.0~40.0℃和pH7.0~9.0时米糠酯酶均保持良好的稳定性。氯化胆碱-甘油、脯氨酸-甘油两种NADES对米糠酯酶的活力有较好的维持作用。结论:天然低共熔溶剂提取方式是一种简单、绿色的提取方式,可为生物活性化合物的绿色提取研究提供一些参考。展开更多
本研究采用天然低共熔溶剂(Natural deep eutectic solvents,NADES)提取米糠蛋白的工艺并利用响应面方法对工艺参数进行优化,且通过采用傅里叶红外光谱和投射扫描电镜分析对天然低共熔溶剂提取米糠蛋白进行表征。结果表明,米糠蛋白提取...本研究采用天然低共熔溶剂(Natural deep eutectic solvents,NADES)提取米糠蛋白的工艺并利用响应面方法对工艺参数进行优化,且通过采用傅里叶红外光谱和投射扫描电镜分析对天然低共熔溶剂提取米糠蛋白进行表征。结果表明,米糠蛋白提取最佳工艺条件为:含有4.7%水分的脯氨酸-甘油(摩尔比2:5)溶剂体系中,米糠和溶剂料液比为9:30 g/g,水浴搅拌3.0 h,反应温度为65℃,此时米糠蛋白提取率为82.69%,通过采用傅里叶红外光谱分析发现提取米糠蛋白过程中没有生成新物质,且天然低共熔溶剂能有效破坏米糠组织结构,释放米糠蛋白,从而提高米糠蛋白提取率。本研究为天然低共熔溶剂提取植物蛋白提供一定参考依据。展开更多
天然低共熔溶剂(natural deep eutectic solvents, NADES)是一种可生物降解、无毒性、可回收、溶解性好、价格低廉、制备简单以及性质可调的新型绿色溶剂,在天然聚多糖加工与应用方面具有广泛的前景。本文综述了NADES的制备和理化性质,...天然低共熔溶剂(natural deep eutectic solvents, NADES)是一种可生物降解、无毒性、可回收、溶解性好、价格低廉、制备简单以及性质可调的新型绿色溶剂,在天然聚多糖加工与应用方面具有广泛的前景。本文综述了NADES的制备和理化性质,概述了NADES在纤维素、淀粉和几丁质溶解、提取、催化转化、纳米材料制备以及膜材料增塑等方面的研究成果,分析了目前NADES在多糖加工中所面临的挑战和机遇,为天然聚多糖资源的开发利用提供了参考。展开更多
Crab shells are an important feedstock for chitin production.However,their highly compact structure significantly limits their use for the production of chitin under mild conditions.Here,a green and efficient approach...Crab shells are an important feedstock for chitin production.However,their highly compact structure significantly limits their use for the production of chitin under mild conditions.Here,a green and efficient approach using a natural deep eutectic solvent(NADES)to produce chitin from crab shells was developed.Its effectiveness in isolating chitin was investigated.The results showed that most proteins and minerals were removed from crab shells and the relative crystallinity of the isolated chitin reached 76%.The quality of the obtained chitin was comparable to chitin isolated by the acid–alkali method.This is the first report on a green method for efficient chitin production from crab shells.This study is expected to open new avenues for green and efficient production of chitin from crab shells.展开更多
基金This work is supported by the National Natural Science Foundation of China(No.51673180 and 51873201).
文摘Green solvents for cellulose dissolution is a key topic for green chemistry,especially natural cellulose with high molecular weight,and there are scarce solvents reported.Deep eutectic solvent(DES)is a typical kind of green solvent that has been attracted much attention recently.Here,high molecular weight natural cellulose(DP>3000)was first isolated from wheat straw and then be directly dissolved in the choline/L-lysine(Ch/Lys)DES.The solution owns excellent stability,and the solubility reaches^5%.Rheological studies revealed that the natural cellulose can be well dispersed in the DES solution and showed gelation at high concentrations.The dissolved cellulose can be regenerated when the dilute acid aqueous solution was added into the solution.It provides an energy conversation and an environmentally friendly route to prepare a cellulose solution,which makes it possible to convert cellulose to valuable chemicals and materials in its homogeneous solution.
基金funded by the Junta de Castilla y Leon(Spain,project NANOCOMP-BU058P20)the Ministerio de Ciencia,Innovación y Universidades(Spain,project RTI2018–101987-B-I00)。
文摘Herein,the synthesis and characterization methods of natural deep eutectic solvents based on monoterpenoids have been presented.Low viscous fluids with suitable physicochemical properties are produced.The materials are non-toxic,biodegradable,and cost-effective.Thus,they can be used to develop sustainable solvents for various processes and can find their applications in various fields.A theoretical study based on quantum chemistry and classical molecular dynamics is used for the nanoscopic characterization of structure,dynamics,and hydrogen bonding.The reported results help analyze the properties of this new family of solvents.The required information for developing structure–property relationships for proper solvent design to form a sustainable chemistry framework is obtained.
文摘植物提取物是畜禽饲料添加剂的重要组成部分,在畜禽养殖中起到抗氧化、抗炎、抗应激和提高生产性能的作用。目前植物提取物的制备多采用常规的有机溶剂(乙醇、氯仿和乙酸乙酯)提取,有机溶剂的易燃、易挥发和毒性会对提取人员造成伤害,提取后的废液会造成环境的污染。天然低共熔溶剂(natural deep eutectic solvents, NADESs)是一种以初级代谢产物等天然成分为原料的新型绿色提取溶剂,具有制备简单、低毒或无毒、价廉易得、可生物降解、可回收利用等优点,是未来替代传统有机提取溶剂的新型溶剂,已广泛应用到化工、食品、中药提取等技术领域。文章综述了天然低共熔溶剂在植物提取物中的最新应用进展,旨在为天然低共熔溶剂的推广和应用提供指导。
基金supported by the Ministry of Science and High Education of the Russian Federation[GEOKHI RAS]
文摘A novel analytical procedure for the determination of gold by electrothermal atomic absorption spectrometry combined with selective liquid-liquid extraction by natural deep eutectic solvents(NADESs)is presented.The extraction ability of the NADESs prepared using menthol,thymol and camphor toward gold in hydrochloric acid solutions was studied.The extraction efficiency was improved by optimizing the parameters including the composition of the NADES s,the volume ratio of organic and aqueous phases,kinetics,and acidity of the solution.Quantitative determination of gold was carried out by electrothermal atomic absorption spectrometry directly in the NADES s phase dissolved in isopropyl alcohol.The extraction recovery of gold from 1 mol/L HCl with the NADESs based on menthol and camphor mixed in a molar ratio 1:1 was 99.7%at an enrichment factor of 100.The limits of detection and quantification of the proposed procedure were 1μg/L and 3.3μg/L,respectively,with a relative standard deviation of less than 5%.The developed procedure was applied for determination of gold in the certified reference material of ore,environmental and waste waters.
基金supported by National Natural Science Foundation of China(No.21864012)Jishou University National and Local United Engineering Laboratory of Integrative Utilization of Eucommia ulmoides open item(No.DZL201801)Natural Science Innovation Project of Jishou University(No.Jdy20049)。
文摘Due to environmental protection requirements,extraction of bioactive compounds from plant materials using environment-friendly green solvents has always been a research hotspot.And great efforts of scholars have been made in this direction,as well as environment-friendly solvents have been used to develop many innovative extraction techniques.Ionic liquids(ILs)and deep eutectic solvents(DESs)are two kinds of typical designable green solvents,which are potential replacements for traditional volatile organic solvents used for extracting.Under the substances action of inorganic salts or polymers,ILs/DESs can form an aqueous two-phase system(ATPS),which has obvious advantages for separating natural products.This paper discussed the phase separation principle of ILs/DESs-based ATPSs and reviewed the applications in the extraction of natural active molecules in recent years,as well as to promote the development of separation of the active constituents in Chinese materia medica.
文摘天然低共熔溶剂(natural deep eutectic solvents, NADES)是一种可生物降解、无毒性、可回收、溶解性好、价格低廉、制备简单以及性质可调的新型绿色溶剂,在天然聚多糖加工与应用方面具有广泛的前景。本文综述了NADES的制备和理化性质,概述了NADES在纤维素、淀粉和几丁质溶解、提取、催化转化、纳米材料制备以及膜材料增塑等方面的研究成果,分析了目前NADES在多糖加工中所面临的挑战和机遇,为天然聚多糖资源的开发利用提供了参考。
基金supported by China Agriculture Research System(CARS-48)Taishan Scholar Project of Shandong Province(tsqn201812020)Fundamental Research Funds for the Central Universities(201941002).
文摘Crab shells are an important feedstock for chitin production.However,their highly compact structure significantly limits their use for the production of chitin under mild conditions.Here,a green and efficient approach using a natural deep eutectic solvent(NADES)to produce chitin from crab shells was developed.Its effectiveness in isolating chitin was investigated.The results showed that most proteins and minerals were removed from crab shells and the relative crystallinity of the isolated chitin reached 76%.The quality of the obtained chitin was comparable to chitin isolated by the acid–alkali method.This is the first report on a green method for efficient chitin production from crab shells.This study is expected to open new avenues for green and efficient production of chitin from crab shells.