The application of soxhlet, ultrasonic and accelerated solvent extractiontechniques to the analysis of six organochlorine pesticides (α-HCH, β-HCH, γ-HCH, o, p'-DDT,p,p'-DDT and p,p'-DDE) in Taihu Lake ...The application of soxhlet, ultrasonic and accelerated solvent extractiontechniques to the analysis of six organochlorine pesticides (α-HCH, β-HCH, γ-HCH, o, p'-DDT,p,p'-DDT and p,p'-DDE) in Taihu Lake sediment samples is described. It was found that the limits ofquantification ranged from 0.002 μg g^(-1) to 0.004 μg g^(-1), and the recoveries oforganochlorine pesticides with the three extraction techniques were acceptable ( 】80.7%). With amass selective detector, better results were obtained by accelerated solvent extraction usinghexane-acetone (1:1) as compared with soxhlet and ultrasonic extraction. It was shown that theaccelerated solvent extraction was the optimum technique for the analysis of organochlorinepesticides in sediments. The general features of the three extraction techniques are also presented.展开更多
Berry fruits are known as“superfoods”due to health benefits associated with the high content of bioactive compounds or phytonutrients.Organic extraction solvents are fundamentally volatile compounds acquired from no...Berry fruits are known as“superfoods”due to health benefits associated with the high content of bioactive compounds or phytonutrients.Organic extraction solvents are fundamentally volatile compounds acquired from non-renewable resources,i.e petroleum-based solvents are presumed to be harmful to both human health and the environment.Owing to the new emphasis on environmental and safety protections and the development of green chemistry,finding alternative solvents to replace the organic ones has recently become a major concern.Indeed,there is a great interest in the scientific community to develop a suitable green approach to allow the extraction and recovery of the bioactive phytonutrients from berry sources for applications in improving human health and nutrition.In this study,the phytonutrient composition of three popular wild berries:blueberry(Vaccinium angustifolium),partridgeberry(Vaccinium vitis-idaea L.)and Rosehipberry(Rosa canina),were evaluated following extraction using biphasic green solvents at pH 2.5,7.0,and 11.5 under pressurized conditions using Accelerated Solvent Extraction(ASE)system.The total phenolic content and composition,antioxidant activity,vitamin and mineral content of the berry extracts were evaluated using Folin-Ciocalteu assay,Ferric Reducing Antioxidant Power Assay(FRAP),Ultra-High-pressure Liquid Chromatography-Mass Spectrometry(UHPLC-MS)and inductively coupled plasma-mass spectrometry(ICP-MS),respectively.The highest total antioxidant activity(p≤0.05)and phenolic content were observed in rosehip berry followed by blueberry and partridgeberry in the hydroethanolic extracts at pH 11.5.Nevertheless,the highest extraction efficiency of total fat-soluble vitamins(FSV)and total B vitamins were also observed in the hydroethanolic extract at pH 11.5.Both in rosehipberry and partridgeberry the highest vitamin C content was observed in hydroethanolic extract at pH 11.5,whereas in blueberry it was observed in the pH 2.5 hydroethanolic extract.In the present study,results demonstrated that using the green solvent system(hydroethanolic,70:30 v/v)at alkaline pH(11.5)as a pressurized fluid in the ASE system provided significant recovery of phytonutrients from wild berries.This green environmentally friendly system of extraction could represent a suitable alternative for the preparation of food grade or green solvent-based extracts for applications in the food and nutraceutical industry.展开更多
Labeled polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)were extracted by three different methods,i.e.,soxhlet extraction,hot extraction and accelerated solvent extraction(ASE).The PCDD/Fs were detected by...Labeled polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)were extracted by three different methods,i.e.,soxhlet extraction,hot extraction and accelerated solvent extraction(ASE).The PCDD/Fs were detected by high resolution gas chromatography-high resolution mass spectrometry.Comparisons of the three methods were carried out by recovery of PCDD/Fs,solvent consumption and extraction time.The results showed that all of the method could extract labeled PCDD/Fs efficiently.ASE was a time saving procedure with lowest consumption of solvents compared with the other two methods.展开更多
A rapid pretreatment method of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in soil and analysis by high resolution gas chromatograph-high resolution mass spectrometry was present.The extraction and a...A rapid pretreatment method of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in soil and analysis by high resolution gas chromatograph-high resolution mass spectrometry was present.The extraction and alumina clean up of PCDD/Fs in soil was achieved by accelerated solvent extractor.Then the multi-layer silica-gel column was used for further clean up.The whole method has been evaluated on certified reference soil and farm soil.Accuracy and precision of this method was tested with satisfactory results.展开更多
The aromatic constituents of tobacco were investigated by Accelerated Solvent Extraction(ASE) and GC-MS.Results obtained from different extraction solvent and temperature were also compared,ASE with acetone solvent in...The aromatic constituents of tobacco were investigated by Accelerated Solvent Extraction(ASE) and GC-MS.Results obtained from different extraction solvent and temperature were also compared,ASE with acetone solvent in the 60℃ gave the most desirable results.There are several virtue in the analysis of the neutral components in tobacco with ASE,including good repeatability,high recovery,simplicity,fast,saving labor and solvent.In addition,ASE is suitable to determine the aromatic constituents of tobacco.展开更多
文摘The application of soxhlet, ultrasonic and accelerated solvent extractiontechniques to the analysis of six organochlorine pesticides (α-HCH, β-HCH, γ-HCH, o, p'-DDT,p,p'-DDT and p,p'-DDE) in Taihu Lake sediment samples is described. It was found that the limits ofquantification ranged from 0.002 μg g^(-1) to 0.004 μg g^(-1), and the recoveries oforganochlorine pesticides with the three extraction techniques were acceptable ( 】80.7%). With amass selective detector, better results were obtained by accelerated solvent extraction usinghexane-acetone (1:1) as compared with soxhlet and ultrasonic extraction. It was shown that theaccelerated solvent extraction was the optimum technique for the analysis of organochlorinepesticides in sediments. The general features of the three extraction techniques are also presented.
文摘Berry fruits are known as“superfoods”due to health benefits associated with the high content of bioactive compounds or phytonutrients.Organic extraction solvents are fundamentally volatile compounds acquired from non-renewable resources,i.e petroleum-based solvents are presumed to be harmful to both human health and the environment.Owing to the new emphasis on environmental and safety protections and the development of green chemistry,finding alternative solvents to replace the organic ones has recently become a major concern.Indeed,there is a great interest in the scientific community to develop a suitable green approach to allow the extraction and recovery of the bioactive phytonutrients from berry sources for applications in improving human health and nutrition.In this study,the phytonutrient composition of three popular wild berries:blueberry(Vaccinium angustifolium),partridgeberry(Vaccinium vitis-idaea L.)and Rosehipberry(Rosa canina),were evaluated following extraction using biphasic green solvents at pH 2.5,7.0,and 11.5 under pressurized conditions using Accelerated Solvent Extraction(ASE)system.The total phenolic content and composition,antioxidant activity,vitamin and mineral content of the berry extracts were evaluated using Folin-Ciocalteu assay,Ferric Reducing Antioxidant Power Assay(FRAP),Ultra-High-pressure Liquid Chromatography-Mass Spectrometry(UHPLC-MS)and inductively coupled plasma-mass spectrometry(ICP-MS),respectively.The highest total antioxidant activity(p≤0.05)and phenolic content were observed in rosehip berry followed by blueberry and partridgeberry in the hydroethanolic extracts at pH 11.5.Nevertheless,the highest extraction efficiency of total fat-soluble vitamins(FSV)and total B vitamins were also observed in the hydroethanolic extract at pH 11.5.Both in rosehipberry and partridgeberry the highest vitamin C content was observed in hydroethanolic extract at pH 11.5,whereas in blueberry it was observed in the pH 2.5 hydroethanolic extract.In the present study,results demonstrated that using the green solvent system(hydroethanolic,70:30 v/v)at alkaline pH(11.5)as a pressurized fluid in the ASE system provided significant recovery of phytonutrients from wild berries.This green environmentally friendly system of extraction could represent a suitable alternative for the preparation of food grade or green solvent-based extracts for applications in the food and nutraceutical industry.
文摘Labeled polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)were extracted by three different methods,i.e.,soxhlet extraction,hot extraction and accelerated solvent extraction(ASE).The PCDD/Fs were detected by high resolution gas chromatography-high resolution mass spectrometry.Comparisons of the three methods were carried out by recovery of PCDD/Fs,solvent consumption and extraction time.The results showed that all of the method could extract labeled PCDD/Fs efficiently.ASE was a time saving procedure with lowest consumption of solvents compared with the other two methods.
文摘A rapid pretreatment method of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in soil and analysis by high resolution gas chromatograph-high resolution mass spectrometry was present.The extraction and alumina clean up of PCDD/Fs in soil was achieved by accelerated solvent extractor.Then the multi-layer silica-gel column was used for further clean up.The whole method has been evaluated on certified reference soil and farm soil.Accuracy and precision of this method was tested with satisfactory results.
文摘The aromatic constituents of tobacco were investigated by Accelerated Solvent Extraction(ASE) and GC-MS.Results obtained from different extraction solvent and temperature were also compared,ASE with acetone solvent in the 60℃ gave the most desirable results.There are several virtue in the analysis of the neutral components in tobacco with ASE,including good repeatability,high recovery,simplicity,fast,saving labor and solvent.In addition,ASE is suitable to determine the aromatic constituents of tobacco.
