Quality and stable isotope characteristics and identification of Wuyi organic tea
Wuyi County is the first"Hometown of Organic Tea"in China.In order to explore the key characteristic indicators of Wuyi organic tea,this study collected tea samples from different fertilizers and organic cultivation years in Wuyi County in early and late spring.Chemical analysis,sensory evaluation,and elemental analysis stable isotope ratio mass spectrometry were used to analyze the main chemical components,sensory quality,the content of carbon,nitrogen elements,and isotope(δ13C、δ15 N)content of tea.The results showed that compared with the tea treated with chemical fertilizers,tea treated with organic fertilizers had a higher content of free amino acids,better aroma and taste.The content of δ15 N was higher.Most of the chemical composition and stable isotope ratios were higher in tea samples grown organically for 5-10 years.Establishing a partial least squares discriminant model using chemical composition and carbon and nitrogen element composition can effectively distinguish between organic and conventional tea cultivation.Combining variable importance for projection analysis,it indicated that the content of δ15 N and tea polyphenol were key characteristic indicators for distinguishing organic tea.This article provides technical support and scientific basis for promoting the healthy development of the organic tea industry and market regulation.
organic teaquality componentsstable isotopepartial least squares method
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万方数据
