Taking refined flour,matsutake powder,and highland barley powder as main raw materials,this experiment studied the optimal formula of matsutake highland barley biscuit. Besides,single factor experiment was carried out...Taking refined flour,matsutake powder,and highland barley powder as main raw materials,this experiment studied the optimal formula of matsutake highland barley biscuit. Besides,single factor experiment was carried out for the amount of highland barley powder,white granulated sugar,and shortening. Then,the response surface optimization analysis was made on crispness and sensory score of the biscuit. The experiment indicates that taking the refined flour as the base 100 g( 100%),the formula of 20% highland barley powder,25% white granulated sugar,and 26% shortening can bake crisp biscuit with complete shape,pure flavor and high quality.展开更多
[Objectives] To study the optimal extraction process for polysaccharides of Urtica fissa E. Pritz. [Methods] Leaves of wild U. fissa E. Pritz. collected in Nyingchi of Tibet were used as raw materials. Water extractio...[Objectives] To study the optimal extraction process for polysaccharides of Urtica fissa E. Pritz. [Methods] Leaves of wild U. fissa E. Pritz. collected in Nyingchi of Tibet were used as raw materials. Water extraction method was used to extract polysaccharides from U. fissa E. Pritz. Besides,comparison was made for the effects of extraction time,extraction temperature and solid-to-liquid ratio on the yield rate of polysaccharides from U. fissa E. Pritz. In addition,using the extraction time,extraction temperature and solid-to-liquid ratio as factors,L9( 33) orthogonal experiment was carried out to determine the optimal process parameters for water extraction of polysaccharides from U. fissa E. Pritz.[Results] The optimal process parameters: hot water extraction time was 4 h,the extraction temperature was 90℃,and the mass ratio of water to leaves of U. fissa E. Pritz. was 1∶ 25. Under such extraction conditions,the yield rate of polysaccharides from U. fissa E. Pritz.was up to 11. 611%. [Conclusions]This experiment is expected to provide certain reference for reasonable development and utilization of wild U. fissa E. Pritz. resources in Tibet.展开更多
[Objectives]To study the optimal extraction process of total flavonoids in Rhodiola rosea L.,and further facilitate the development and utilization of Rhodiola rosea L. [Methods]With Rhodiola crenulata as raw material...[Objectives]To study the optimal extraction process of total flavonoids in Rhodiola rosea L.,and further facilitate the development and utilization of Rhodiola rosea L. [Methods]With Rhodiola crenulata as raw material,ethanol as extractant,ultrasonic extraction as the extraction method,the single factor method was first used for preliminary investigation of effect of ethanol volume fraction,solid-liquid ratio,extraction temperature and extraction time on the flavonoids extraction rate,and then the Box-Behnken response surface method was used to optimize the extraction process of total flavonoids in R. crenulata. [Results] The optimal extraction conditions: ethanol concentration of 72%;solid-liquid ratio of 1∶ 43; extraction temperature of 66℃; extraction time of 50 min. Under these conditions,the extraction rate of total flavonoids from R. crenulata was 2. 591%. [Conclusions] The results showed that the method of response surface was reasonable and feasible for the optimization of ultrasonic extraction of total flavonoids from R. crenulata.展开更多
[Objectives] To measure and analyze chemical composition of R. crenulata. [Methods] Taking R. crenulata in Lang County of Tibet as the research object,the routine nutritional components,trace elements and amino acid w...[Objectives] To measure and analyze chemical composition of R. crenulata. [Methods] Taking R. crenulata in Lang County of Tibet as the research object,the routine nutritional components,trace elements and amino acid were determined,and the nutrition was evaluated by the international general evaluation method. [Results]The protein content of R. crenulata in Lang County of Tibet was 2. 08%,and fat was 5. 67%. Amino acid was incomplete amino acid,and Ile,Met + Cys were the first limiting amino acids of rhodiola root protein,while Leu was the second limiting amino acid of rhodiola root protein. The final amino acid score was 0. Magnesium,iron,zinc and other mineral elements were abundant,and there was no mercury,cadmium,lead and other heavy metals residues. [Conclusions]The research could provide a powerful basis for industrialization development of rhodiola.展开更多
Qinghai-Tibet plateau with an average altitude above 4,000 m provides favorable conditions for Tibetan pigs that may have different meat quality from other pig breeds.This study was designed to compare the differences...Qinghai-Tibet plateau with an average altitude above 4,000 m provides favorable conditions for Tibetan pigs that may have different meat quality from other pig breeds.This study was designed to compare the differences in lipid metabolism in liver and fatty acid composition in muscle between Tibetan and Duroc×Landrace×Yorkshire(DLY)pigs.Aba Tibetan pigs(n=10),Gannan Tibetan pigs(n=9),Nyingchi Tibetan pigs(n=10)and DLY pigs(n=10)were selected for the experiment.After fasting for 12 h,they were slaughtered and blood,liver and muscle samples were taken for biochemical analyses.The results showed that the intramuscular fat content was not significantly different for Tibetan pigs among the three regions(P>0.05),which was significantly higher than that of DLY pigs(P<0.05).However,the liver fat content of Gannan Tibetan pigs was significantly lower than those of DLY pigs and Aba and Nyingchi Tibetan pigs(P<0.05).The hepatic lipid metabolism may be stronger in DLY pigs than in Tibetan pigs,but lipid deposition in muscle is weaker in DLY pigs than that in Tibetan pigs.Aba Tibetan pigs and Nyingchi Tibetan pigs had similar proportions of saturated,monounsaturated and polyunsaturated fatty acids,while Gannan Tibetan pigs and DLY pigs had similar types of fatty acids.The findings provide new insight into mechanisms of environmental and breed effects on pork quality.展开更多
基金Supported by Agricultural Product Processing Technology and Product Development Project of the 13th Five-Year Plan of Tibet
文摘Taking refined flour,matsutake powder,and highland barley powder as main raw materials,this experiment studied the optimal formula of matsutake highland barley biscuit. Besides,single factor experiment was carried out for the amount of highland barley powder,white granulated sugar,and shortening. Then,the response surface optimization analysis was made on crispness and sensory score of the biscuit. The experiment indicates that taking the refined flour as the base 100 g( 100%),the formula of 20% highland barley powder,25% white granulated sugar,and 26% shortening can bake crisp biscuit with complete shape,pure flavor and high quality.
基金Supported by Project of Natural Science Foundation of Tibet Autonomous Region(2016ZR-15-31)
文摘[Objectives] To study the optimal extraction process for polysaccharides of Urtica fissa E. Pritz. [Methods] Leaves of wild U. fissa E. Pritz. collected in Nyingchi of Tibet were used as raw materials. Water extraction method was used to extract polysaccharides from U. fissa E. Pritz. Besides,comparison was made for the effects of extraction time,extraction temperature and solid-to-liquid ratio on the yield rate of polysaccharides from U. fissa E. Pritz. In addition,using the extraction time,extraction temperature and solid-to-liquid ratio as factors,L9( 33) orthogonal experiment was carried out to determine the optimal process parameters for water extraction of polysaccharides from U. fissa E. Pritz.[Results] The optimal process parameters: hot water extraction time was 4 h,the extraction temperature was 90℃,and the mass ratio of water to leaves of U. fissa E. Pritz. was 1∶ 25. Under such extraction conditions,the yield rate of polysaccharides from U. fissa E. Pritz.was up to 11. 611%. [Conclusions]This experiment is expected to provide certain reference for reasonable development and utilization of wild U. fissa E. Pritz. resources in Tibet.
基金Supported by Tibetan 13th Five-Year Agricultural Product Processing and Product Development Project
文摘[Objectives]To study the optimal extraction process of total flavonoids in Rhodiola rosea L.,and further facilitate the development and utilization of Rhodiola rosea L. [Methods]With Rhodiola crenulata as raw material,ethanol as extractant,ultrasonic extraction as the extraction method,the single factor method was first used for preliminary investigation of effect of ethanol volume fraction,solid-liquid ratio,extraction temperature and extraction time on the flavonoids extraction rate,and then the Box-Behnken response surface method was used to optimize the extraction process of total flavonoids in R. crenulata. [Results] The optimal extraction conditions: ethanol concentration of 72%;solid-liquid ratio of 1∶ 43; extraction temperature of 66℃; extraction time of 50 min. Under these conditions,the extraction rate of total flavonoids from R. crenulata was 2. 591%. [Conclusions] The results showed that the method of response surface was reasonable and feasible for the optimization of ultrasonic extraction of total flavonoids from R. crenulata.
文摘[Objectives] To measure and analyze chemical composition of R. crenulata. [Methods] Taking R. crenulata in Lang County of Tibet as the research object,the routine nutritional components,trace elements and amino acid were determined,and the nutrition was evaluated by the international general evaluation method. [Results]The protein content of R. crenulata in Lang County of Tibet was 2. 08%,and fat was 5. 67%. Amino acid was incomplete amino acid,and Ile,Met + Cys were the first limiting amino acids of rhodiola root protein,while Leu was the second limiting amino acid of rhodiola root protein. The final amino acid score was 0. Magnesium,iron,zinc and other mineral elements were abundant,and there was no mercury,cadmium,lead and other heavy metals residues. [Conclusions]The research could provide a powerful basis for industrialization development of rhodiola.
基金funded by the Ministry of Finance and Ministry of Agriculture and Rural Affairs (CARS-35)Jiangsu Innovative Group of Meat Nutrition,Health and Biotechnology.
文摘Qinghai-Tibet plateau with an average altitude above 4,000 m provides favorable conditions for Tibetan pigs that may have different meat quality from other pig breeds.This study was designed to compare the differences in lipid metabolism in liver and fatty acid composition in muscle between Tibetan and Duroc×Landrace×Yorkshire(DLY)pigs.Aba Tibetan pigs(n=10),Gannan Tibetan pigs(n=9),Nyingchi Tibetan pigs(n=10)and DLY pigs(n=10)were selected for the experiment.After fasting for 12 h,they were slaughtered and blood,liver and muscle samples were taken for biochemical analyses.The results showed that the intramuscular fat content was not significantly different for Tibetan pigs among the three regions(P>0.05),which was significantly higher than that of DLY pigs(P<0.05).However,the liver fat content of Gannan Tibetan pigs was significantly lower than those of DLY pigs and Aba and Nyingchi Tibetan pigs(P<0.05).The hepatic lipid metabolism may be stronger in DLY pigs than in Tibetan pigs,but lipid deposition in muscle is weaker in DLY pigs than that in Tibetan pigs.Aba Tibetan pigs and Nyingchi Tibetan pigs had similar proportions of saturated,monounsaturated and polyunsaturated fatty acids,while Gannan Tibetan pigs and DLY pigs had similar types of fatty acids.The findings provide new insight into mechanisms of environmental and breed effects on pork quality.
