The research progress on the development and application of new natural tobacco humectants was reviewed in the paper.Plants,animals and microbes contain special moisturizing substances,showing distinctive advantages a...The research progress on the development and application of new natural tobacco humectants was reviewed in the paper.Plants,animals and microbes contain special moisturizing substances,showing distinctive advantages and outstanding effects in respect of the tobacco moisture content maintaining and cigarette suction comfort promoting.The development necessity,major types,functional mechanism and influence on cigarette quality of new natural tobacco humectants development were compared and elaborated.Additionally,the prospect of new natural tobacco humectants development and application was forecasted.展开更多
The North Tibet plateau is the world highest plateau with a unique alpine grassland and water environment. To obtain a better understanding of the correct supply of Molybdenum（Mo） to livestock in north Tibet,we inve...The North Tibet plateau is the world highest plateau with a unique alpine grassland and water environment. To obtain a better understanding of the correct supply of Molybdenum（Mo） to livestock in north Tibet,we investigated the content and geographical variation of Mo in different families of pasture plants（n=1017） and water（n=40）,then discuss the Cuprum（Cu）：Mo ratio in different plant families,and calculate the total Mo intake of the yak in north Tibet. The average Mo concentration in five families preferred for grazing are： Compositae（2.71 μg g^（-1））,Leguminosae（2.70 μg g^（-1））,Gramineae（2.48 μg g^（-1））,Cyperaceae（1.63 μg g^（-1））,and Rosaceae（1.51 μg g^（-1））. There was a strong geographical variation in Mo concentration（p 0.001）. The mean value of Mo in north Tibet surface water from 15 sites is 0.89 μg L^（-1）. The Mo ingestion by yak through these plants and water in north Tibet is about 9586 μg day^（-1） which means the toxicity of Mo does not exist in the average daily diet. However,the large geographical variation found may cause some toxicity of Mo in the average daily intake of north Tibet pasture plants in some areas. The Cu：Mo ratio of 2：60 is considered the limit for risk of Mo hyperactivity,while extremely high Cu：Mo ratios may lead to chronic copper poisoning. Our survey of plant samples found 43.29% below and 29.3% above the limiting Cu：Mo ratio of 60 indicating some risk to north Tibet livestock.展开更多
基金Supported by the Fund for the Open Project of Anhui Key Laboratory of Tobacco Chemistry (No.W2015JSKF0493 and W2015JSKF0492)the China Postdoctoral Science Foundation (No.2015T80646 and 2013M531501)the National Natural Science Foundation of China (No.31400049)
文摘The research progress on the development and application of new natural tobacco humectants was reviewed in the paper.Plants,animals and microbes contain special moisturizing substances,showing distinctive advantages and outstanding effects in respect of the tobacco moisture content maintaining and cigarette suction comfort promoting.The development necessity,major types,functional mechanism and influence on cigarette quality of new natural tobacco humectants development were compared and elaborated.Additionally,the prospect of new natural tobacco humectants development and application was forecasted.
基金Key Science and Technology Research Program of Tibet(ZDZX2017000122,XZ201801NA02)Natural Science Foundation of Tibet(2016ZR-15-76)Key Science and Technology Research Program of Tibet(Z2016C01G01)
文摘The North Tibet plateau is the world highest plateau with a unique alpine grassland and water environment. To obtain a better understanding of the correct supply of Molybdenum（Mo） to livestock in north Tibet,we investigated the content and geographical variation of Mo in different families of pasture plants（n=1017） and water（n=40）,then discuss the Cuprum（Cu）：Mo ratio in different plant families,and calculate the total Mo intake of the yak in north Tibet. The average Mo concentration in five families preferred for grazing are： Compositae（2.71 μg g^（-1））,Leguminosae（2.70 μg g^（-1））,Gramineae（2.48 μg g^（-1））,Cyperaceae（1.63 μg g^（-1））,and Rosaceae（1.51 μg g^（-1））. There was a strong geographical variation in Mo concentration（p 0.001）. The mean value of Mo in north Tibet surface water from 15 sites is 0.89 μg L^（-1）. The Mo ingestion by yak through these plants and water in north Tibet is about 9586 μg day^（-1） which means the toxicity of Mo does not exist in the average daily diet. However,the large geographical variation found may cause some toxicity of Mo in the average daily intake of north Tibet pasture plants in some areas. The Cu：Mo ratio of 2：60 is considered the limit for risk of Mo hyperactivity,while extremely high Cu：Mo ratios may lead to chronic copper poisoning. Our survey of plant samples found 43.29% below and 29.3% above the limiting Cu：Mo ratio of 60 indicating some risk to north Tibet livestock.
