Chuño production is a kind of ancient method of potato preservation that has been used to the present day.In this study,physicochemical property and nutrition quality of white chuño(WC),black chuño,and ...Chuño production is a kind of ancient method of potato preservation that has been used to the present day.In this study,physicochemical property and nutrition quality of white chuño(WC),black chuño,and dehydrated potato flour prepared by hot air drying(AD)and freezing drying were analyzed and compared.The results revealed that the average particle size of the starch in WC is almost 10 times of the dehydrated potato flour by AD treatment according to the laser particle size meter.During the dehydration of WC,water-soluble minerals(K+,Mg2+),proteins,ascorbic acid,etc.were partly lost while Ca2+content increased dramatically.In addition,WC showed the lowest antioxidant capacity among the four different kinds of dehydrated potato products.The polyphenol oxidase activity of WC,black chuño and AD were between 0.62–12.2 U/g fresh weight,which indicated that the color will be stable when chuño was used as staple food ingredient in the subsequent process.Therefore,as a potato processed food,chuño displayed great potential for promotion in the cold and poor rural areas of the northern China.展开更多
A non-parametric method of data envelopment analysis(DEA)was applied to analyze the technical and scale efficiency of potato production in 23 Iranian provinces.In many real applications,inputs and outputs may be impre...A non-parametric method of data envelopment analysis(DEA)was applied to analyze the technical and scale efficiency of potato production in 23 Iranian provinces.In many real applications,inputs and outputs may be imprecise.In the present study,a robust DEA(RDEA)optimization framework was used to concentrate on DEA with uncertain data.The method was based on six inputs(human labor rent,land rent,diesel and machinery rent,irrigation water cost,fertilizer cost,pesticide cost)and the single output of potato gross return.The proposed DEA for 23 Iranian potato-producing provinces reveals that the average technical efficiency is 90%and scale efficiency is 97%.This suggests that inefficient provinces can potentially reduce their overall costs for potato production.A Monte Carlo simulation was used to compute the conformity of the rankings from the RDEA model with reality to illustrate the importance of varying the level of efficiency for different levels of conservatism.展开更多
基金supported by the earmarked fund for CARS(Grant No.CARS-09)High Technology Industrialization of Sccience and Technology Cooperation Between Jilin Province and Chinese Academy of Sciences(Grant No.2021SYHZ0005)Key Research and Development Plan of Ningxia Hui Autonomous Region(Grant No.2020BBF03018).
文摘Chuño production is a kind of ancient method of potato preservation that has been used to the present day.In this study,physicochemical property and nutrition quality of white chuño(WC),black chuño,and dehydrated potato flour prepared by hot air drying(AD)and freezing drying were analyzed and compared.The results revealed that the average particle size of the starch in WC is almost 10 times of the dehydrated potato flour by AD treatment according to the laser particle size meter.During the dehydration of WC,water-soluble minerals(K+,Mg2+),proteins,ascorbic acid,etc.were partly lost while Ca2+content increased dramatically.In addition,WC showed the lowest antioxidant capacity among the four different kinds of dehydrated potato products.The polyphenol oxidase activity of WC,black chuño and AD were between 0.62–12.2 U/g fresh weight,which indicated that the color will be stable when chuño was used as staple food ingredient in the subsequent process.Therefore,as a potato processed food,chuño displayed great potential for promotion in the cold and poor rural areas of the northern China.
文摘A non-parametric method of data envelopment analysis(DEA)was applied to analyze the technical and scale efficiency of potato production in 23 Iranian provinces.In many real applications,inputs and outputs may be imprecise.In the present study,a robust DEA(RDEA)optimization framework was used to concentrate on DEA with uncertain data.The method was based on six inputs(human labor rent,land rent,diesel and machinery rent,irrigation water cost,fertilizer cost,pesticide cost)and the single output of potato gross return.The proposed DEA for 23 Iranian potato-producing provinces reveals that the average technical efficiency is 90%and scale efficiency is 97%.This suggests that inefficient provinces can potentially reduce their overall costs for potato production.A Monte Carlo simulation was used to compute the conformity of the rankings from the RDEA model with reality to illustrate the importance of varying the level of efficiency for different levels of conservatism.
