Soybean is one of the important crops in China. Soymilk, a traditional neutral plant-based protein drink, is rich in high quality proteins. Although soybean milk is rich in nutrients, its marketing among consumers, es...Soybean is one of the important crops in China. Soymilk, a traditional neutral plant-based protein drink, is rich in high quality proteins. Although soybean milk is rich in nutrients, its marketing among consumers, especially those in Western countries who are used to peaceful flavor, has been limited due to the adverse flavor impact brought by its special composition. In recent years, with the increasing attention to the nutritional value of soymilk, the flavor of soymilk has become a popular research object for scholars at home and abroad. The flavor components of soymilk are mainly volatile small molecular compounds produced by enzymatic reactions catalyzed by lipoxygenase(LOX). After formation, they interact with protein macromolecules to form the overall flavor of soymilk. At present, there are many methods to control the off-odor of soymilk at home and abroad, including physical heating methods, chemical methods, biological enzymatic digestion methods, mask methods, and a variety of breeding methods. These methods effectively reduce the off-odor of soymilk, but all of them have shortcomings. Currently, the sensory characteristics of the beany odor in soymilk are evaluated mainly by traditional human sensory scoring along with the assistance of modern instrument analysis of volatile flavor substances using headspace solid phase microextraction(SPME) gas chromatography coupled with-mass spectrometry(GC-MS). This paper summarized the research results of volatile flavor substances in soymilk in recent years and the sensory evaluation methods of soymilk at home and abroad, and looked forward to the future development direction, hoping to provide some theoretical bases and reference detection methods for solving the problem of soymilk flavor in the future.展开更多
The volatile oil was extracted from Curcuma longa and Turmeric oleoresin by Soxhelt method with petroleum ether.All the volatile oil was analyzed of chemical component by the method of GC-MS,the relative contents of t...The volatile oil was extracted from Curcuma longa and Turmeric oleoresin by Soxhelt method with petroleum ether.All the volatile oil was analyzed of chemical component by the method of GC-MS,the relative contents of these compounds were calculated using square peaks to normalization.On the volatile oil of Curcuma longa 35 peaks were separated and 21 compounds were identified,which accounted for 89.10%,the main chemical constituents was (-)-Zingiberene(22.12%),β-Sesquiphellandrene(15.24%),α-Turmerone (11.30%),β-Turmerone (8.87%),Ar-turmerone(8.20%),but on the volatile oil of Turmeric oleoresin 32 peaks were separated,of which 21 compounds were identified,which accounted for 90.12% the main chemical constituents was (-)-Zingiberene(23.92%),β-Sesquiphellandrene(15.73%),Ar-turmerone(12.89%),β-Turmerone(10.85%).展开更多
In this paper,the Illilium verum Hook.f.grow at mountain of Dayao of Jinxiu in Guangxi,Volatile oil was extracted by soxhet method and steam distillation.All the volatile oil was analyzed by GC-MS,the result show the ...In this paper,the Illilium verum Hook.f.grow at mountain of Dayao of Jinxiu in Guangxi,Volatile oil was extracted by soxhet method and steam distillation.All the volatile oil was analyzed by GC-MS,the result show the ingredients and rate of product were change greatly,The major chemical constituents were trans-anethole,estragole and anisaldehyde etc.展开更多
Volatile components were extracted from fresh Canarium pimela Koening fruits by sonication with anhydrous ether,and analyzed by gas chromatography-mass spectrometry(GC-MS) with headspace solid phase micro-extraction(H...Volatile components were extracted from fresh Canarium pimela Koening fruits by sonication with anhydrous ether,and analyzed by gas chromatography-mass spectrometry(GC-MS) with headspace solid phase micro-extraction(HS-SPME).Thirty-seven components were identified with the identification rate of 99.1%.The content of terpene compounds,included 3-thujene(32.64%),α-phellandrene(30.78 %),limonene(18.77%),2-thujene(6.81%),etc,were more than 91.4% in the volatile composition.The fatty acids from fresh Canarium pimela Koening fruits were extracted by sonication with anhydrous ether.The extracted fatty acids were esterified and analyzed by GC-MS.Ten fatty acids including palmitic acid(57.4%),oleic acid(28.92%) and linoleic acid(11.38%),etc,were detected and identified.展开更多
To analyze the chemical constituents of volatile oils from the fruit of Periploca forrestii Schltr.which were collected in Guizhou province.This volatile oils were extracted by simultaneous distillation extraction (SD...To analyze the chemical constituents of volatile oils from the fruit of Periploca forrestii Schltr.which were collected in Guizhou province.This volatile oils were extracted by simultaneous distillation extraction (SDE)and microwave assistant extraction(MAE) method,and ananlyzed by gas chromatography-mass spectrometry(GC-MS)method.The main chemical compounds were methyl salicylate,β-amyrin and β-amyrin acetate etc.The compounds from the volatile oils extracted with SDE and MAE are quite different.The results provide scientific proof for the further development and utilization of Periploca forrestii Schltr.展开更多
The volatiles of Platycladus orientalis L.’s phloem were extracted by a simple distillation technique and a Sohlet’s extraction method,respectively,and analyzed by GC-MS.The results showed that the volatiles consist...The volatiles of Platycladus orientalis L.’s phloem were extracted by a simple distillation technique and a Sohlet’s extraction method,respectively,and analyzed by GC-MS.The results showed that the volatiles consisted of monoterpene,sesquiterpene and ethanols,aldehydes,esters and et al.For extracts by Sohlet’s extraction,the major compounds were the high boiling point chemicals such as ethanols,aldehydes,esters and et al;for extracts by simple distillation method,sesquiterpenes were the major part.The simple distillation method was easy to operate and low-cost,and was suitable for extracting volatiles for forest insect attractant.展开更多
A thermal desorption method for analysis of the volatile components on carbon particles,which were produced by the combustion of diesel oil,has been developed.The collection equipment of carbon particles was designed ...A thermal desorption method for analysis of the volatile components on carbon particles,which were produced by the combustion of diesel oil,has been developed.The collection equipment of carbon particles was designed and the pyrolysis instrument was used as the thermal desorption equipment.The collected carbon particles were injected into the pyrolysis instrument and desorbed at the temperature of 700 ℃.All the volatile components were analyzed by gas chromatography-mass spectrometry(GC-MS).The results showed that the volatile component on carbon particle could be rapidly analyzed.The method provided a guidance to the further research of the burning behaviors of the diesel oil.展开更多
The cellulase was used for extracting the volatile constituents of the Leonurus japonicus Houtt.The effects of the pH,the amounts and the fineness of cellulase were discussed.The average yield obtained was 4.05%.16 ch...The cellulase was used for extracting the volatile constituents of the Leonurus japonicus Houtt.The effects of the pH,the amounts and the fineness of cellulase were discussed.The average yield obtained was 4.05%.16 chemical components were identified by gas chromatography-mass spectrometry (GC-MS)method.The cellulase extraction (CE)method was made a camparison with distillation extraction (DSE)method.展开更多
The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been conf...The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been confirmed; the processing methods to analyse spectrum data automatically have been found; It is simple,quick,sensitive and reliable,and can take place of manual operation,It is very useful to screen the familiar toxicants in unkown sample.展开更多
Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compound...Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compounds are 94.83 % of the total volatile substances.展开更多
基金Supported by the Youth Fund Project of the National Natural Science Foundation of China(32001570)the Post-doctorate Program Funding in Heilongjiang Province(LBH-Z19118)the Academic Backbone'Project of Northeast Agricultural University(20XG11)。
文摘Soybean is one of the important crops in China. Soymilk, a traditional neutral plant-based protein drink, is rich in high quality proteins. Although soybean milk is rich in nutrients, its marketing among consumers, especially those in Western countries who are used to peaceful flavor, has been limited due to the adverse flavor impact brought by its special composition. In recent years, with the increasing attention to the nutritional value of soymilk, the flavor of soymilk has become a popular research object for scholars at home and abroad. The flavor components of soymilk are mainly volatile small molecular compounds produced by enzymatic reactions catalyzed by lipoxygenase(LOX). After formation, they interact with protein macromolecules to form the overall flavor of soymilk. At present, there are many methods to control the off-odor of soymilk at home and abroad, including physical heating methods, chemical methods, biological enzymatic digestion methods, mask methods, and a variety of breeding methods. These methods effectively reduce the off-odor of soymilk, but all of them have shortcomings. Currently, the sensory characteristics of the beany odor in soymilk are evaluated mainly by traditional human sensory scoring along with the assistance of modern instrument analysis of volatile flavor substances using headspace solid phase microextraction(SPME) gas chromatography coupled with-mass spectrometry(GC-MS). This paper summarized the research results of volatile flavor substances in soymilk in recent years and the sensory evaluation methods of soymilk at home and abroad, and looked forward to the future development direction, hoping to provide some theoretical bases and reference detection methods for solving the problem of soymilk flavor in the future.
文摘The volatile oil was extracted from Curcuma longa and Turmeric oleoresin by Soxhelt method with petroleum ether.All the volatile oil was analyzed of chemical component by the method of GC-MS,the relative contents of these compounds were calculated using square peaks to normalization.On the volatile oil of Curcuma longa 35 peaks were separated and 21 compounds were identified,which accounted for 89.10%,the main chemical constituents was (-)-Zingiberene(22.12%),β-Sesquiphellandrene(15.24%),α-Turmerone (11.30%),β-Turmerone (8.87%),Ar-turmerone(8.20%),but on the volatile oil of Turmeric oleoresin 32 peaks were separated,of which 21 compounds were identified,which accounted for 90.12% the main chemical constituents was (-)-Zingiberene(23.92%),β-Sesquiphellandrene(15.73%),Ar-turmerone(12.89%),β-Turmerone(10.85%).
文摘In this paper,the Illilium verum Hook.f.grow at mountain of Dayao of Jinxiu in Guangxi,Volatile oil was extracted by soxhet method and steam distillation.All the volatile oil was analyzed by GC-MS,the result show the ingredients and rate of product were change greatly,The major chemical constituents were trans-anethole,estragole and anisaldehyde etc.
文摘Volatile components were extracted from fresh Canarium pimela Koening fruits by sonication with anhydrous ether,and analyzed by gas chromatography-mass spectrometry(GC-MS) with headspace solid phase micro-extraction(HS-SPME).Thirty-seven components were identified with the identification rate of 99.1%.The content of terpene compounds,included 3-thujene(32.64%),α-phellandrene(30.78 %),limonene(18.77%),2-thujene(6.81%),etc,were more than 91.4% in the volatile composition.The fatty acids from fresh Canarium pimela Koening fruits were extracted by sonication with anhydrous ether.The extracted fatty acids were esterified and analyzed by GC-MS.Ten fatty acids including palmitic acid(57.4%),oleic acid(28.92%) and linoleic acid(11.38%),etc,were detected and identified.
文摘To analyze the chemical constituents of volatile oils from the fruit of Periploca forrestii Schltr.which were collected in Guizhou province.This volatile oils were extracted by simultaneous distillation extraction (SDE)and microwave assistant extraction(MAE) method,and ananlyzed by gas chromatography-mass spectrometry(GC-MS)method.The main chemical compounds were methyl salicylate,β-amyrin and β-amyrin acetate etc.The compounds from the volatile oils extracted with SDE and MAE are quite different.The results provide scientific proof for the further development and utilization of Periploca forrestii Schltr.
文摘The volatiles of Platycladus orientalis L.’s phloem were extracted by a simple distillation technique and a Sohlet’s extraction method,respectively,and analyzed by GC-MS.The results showed that the volatiles consisted of monoterpene,sesquiterpene and ethanols,aldehydes,esters and et al.For extracts by Sohlet’s extraction,the major compounds were the high boiling point chemicals such as ethanols,aldehydes,esters and et al;for extracts by simple distillation method,sesquiterpenes were the major part.The simple distillation method was easy to operate and low-cost,and was suitable for extracting volatiles for forest insect attractant.
文摘A thermal desorption method for analysis of the volatile components on carbon particles,which were produced by the combustion of diesel oil,has been developed.The collection equipment of carbon particles was designed and the pyrolysis instrument was used as the thermal desorption equipment.The collected carbon particles were injected into the pyrolysis instrument and desorbed at the temperature of 700 ℃.All the volatile components were analyzed by gas chromatography-mass spectrometry(GC-MS).The results showed that the volatile component on carbon particle could be rapidly analyzed.The method provided a guidance to the further research of the burning behaviors of the diesel oil.
文摘The cellulase was used for extracting the volatile constituents of the Leonurus japonicus Houtt.The effects of the pH,the amounts and the fineness of cellulase were discussed.The average yield obtained was 4.05%.16 chemical components were identified by gas chromatography-mass spectrometry (GC-MS)method.The cellulase extraction (CE)method was made a camparison with distillation extraction (DSE)method.
文摘The spectrum user’s librarys containing 1533 familiar toxicants have been built; A method with high separability and sensitivity has been found,The RT and the detection limit of 210 familiar abuse drugs has been confirmed; the processing methods to analyse spectrum data automatically have been found; It is simple,quick,sensitive and reliable,and can take place of manual operation,It is very useful to screen the familiar toxicants in unkown sample.
文摘Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compounds are 94.83 % of the total volatile substances.
