Lingyun pekoe green tea identification method

Abstract

The invention discloses a Lingyun pekoe green tea identification method which mainly comprises the following steps: (1) collecting Lingyun pekoe green tea and other green tea samples, weighing a proper amount of tea samples, putting the tea samples into a headspace bottle, and then directly carrying out qualitative and quantitative determination on aroma components of the samples through a dynamic headspace-gas chromatography-mass spectrometry (DHS-GC-MS) technology; and (2) based on the aroma component composition and the peak area of each tea sample, establishing different brand green tea discrimination models through partial least squares-discriminant analysis (PLS-DA) to obtain a score map of each tea sample, and performing Lingyun pekoe green tea identification by using the PLS-DA score map. According to the method, the dynamic headspace-gas chromatography-mass spectrometry technology is adopted for determining the aroma components of the Lingyun pekoe tea, a pretreatment process is not needed, operation is easy and convenient, cost is saved, the method is environmentally friendly, meanwhile, the Lingyun pekoe tea is recognized in combination with a partial least square method-discriminant analysis method, the result is objective and reliable, and the correct recognition rate of 90% or above is achieved.

Description

technical field [0001] The invention belongs to the technical field of tea quality detection, and in particular relates to an identification method for Lingyun pekoe green tea. Background technique [0002] Lingyun Pekoe Tea is a national-level excellent tea tree variety unique to Guangxi. It belongs to the National Geographical Indication Product and is known as "a thousand teas". The tea soup of Lingyun Pekoe Tea has a strong and long-lasting aroma. Among the major teas, green tea is unfermented tea, which retains more natural substances of fresh leaves, and has special effects on cancer prevention, anti-cancer, sterilization, anti-inflammation, and anti-aging, which is beyond the reach of other teas Lingyun Pekoe green tea on the market is also the most popular tea among all kinds of suitable teas of Lingyun Pekoe. Volatile aroma components in tea are important indicators of tea quality evaluation. In sensory evaluation, the contribution rate of aroma to tea sensory qua...

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Problems solved by technology

[0003] In recent years, there have been frequent reports of false teas being passed off as genuine ones and inferior ones as good ones, seriously infringing on the rights and interests of consumers, damaging the brand image and disrupting the market order.

At present, in the identification of Lingyun Pekoe tea, the existing reports are based on the appearance, taste, sensory aroma and other methods of Lingyun Pekoe tea. These methods are greatly affected by people's subjective consciousness, and the correct recognition rate is limited. There is no report on identifying the aroma components of Lingyun Pekoe tea through qualitative and quantitative determination, combined with multivariate statistical analysis to establish a discriminant model

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