Abstract
In this paper, the kinds and contents of amino acids in Cordyceps sinensis from different habitats of Tibet components using principal component analysis and cluster analysis, the principal component cluster analysis to evaluate the nutritional value of different localities, and provide scientific basis for the further research and development and utilization of Cordyceps resources in Tibet area. The principal component analysis method is a method of using the central idea of dimensionality reduction, the analysis method of multi indicators into a multivariate data several comprehensive index of a few statistics. The principal component analysis method can guarantee the minimizing loss of original data information, with less comprehensive variables instead of multiple variables of the original. Cluster analysis can be used to classify samples of multiple variables by using comprehensive information, the classification results are intuitive, clustering dendrogram clearly show the results of numerical classification, clustering analysis results than the traditional classification method is more detailed, comprehensive, reasonable.
Highlights
Cordyceps sinensis is Cordycepssinensis Sacc parasitic on the drying complex of stroma of the parasitic bat moth larvae on the insects and larval body[1], it is a traditional rare tonic medicine in china, the earliest found in the "Materia Medica from the new", it is the nature of "gamping", have the effect of "protect lung and tonifying kidney, eliminating phlegm, relieving cough"
The range of total amino acids between the 23.4%~24.52%, essential amino acids accounted for total amino acids between the 26.47%~27.52%, fresh flavor amino acids accounted for total amino acids between the 35.12%~37.44% and drug effective amino acids accounted for total amino acids in the range between the 55.03%~57.54% In this paper, we use the data of Yan Dong and Yang Xinyu[13], The method is improved by using Principal component cluster analysis
The comprehensive score calculation looks very reasonable and it seems to increase the information content, that is, to increase the variance contribution rate, it is just an illusion, through to calculate the variance of H we can found that it is possible to completely opposite conclusions. From this process we find that the variance of the composite score is smaller than the variance of the first principal component, which indicates that the information content of the comprehensive principal component score is less than that of the first principal component
Summary
Cordyceps sinensis is Cordycepssinensis Sacc parasitic on the drying complex of stroma of the parasitic bat moth larvae on the insects and larval body[1], it is a traditional rare tonic medicine in china, the earliest found in the "Materia Medica from the new", it is the nature of "gamping", have the effect of "protect lung and tonifying kidney, eliminating phlegm, relieving cough". Modern pharmacological research show that the Cordyceps sinensis has to adjust the body's immune[2], fall hematic fat, fall blood sugar, anti-aging, anti-tumor and many kinds of pharmacological activities[3-4], the amino acid is material base of Cordyceps sinensis to strong effect and enhance immune function[5], and it is closely related to the function of the auxiliary treatment of nervous system[6], digestive system disease and antibacteria. Zhang Shishan[7]research showed that some amino acids inCordyceps sinensis has sedative effects. China's Tibet the main producing areas of Cordyceps sinensis, at present, for Tibet within the jurisdiction of different habitats component analysis of amino acid in Cordyceps sinensis has not been reported. This paper intends to analysis and evaluation of nutritional value of amino acids in Cordyceps sinensis from different regions of Tibet, in order for further research and development by China's Tibet Cordyceps sinensis resources to provide a scientific basis
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