Discriminating geographical origins of green tea based on amino acid, polyphenol, and caffeine content through high‐performance liquid chromatography: Taking Lu’an guapian tea as an example

Abstract

Seventy‐three Lu'an guapian tea (LAGP) samples were collected from 11 growing locations in the city of Lu'an, Anhui Province, China. Through high‐performance liquid chromatography, 18 amino acids, along with gallic acid, caffeine, and five catechins, were quantitatively detected. Hierarchical cluster, correlation and principal component analysis, and a support vector machine were used for geographical discrimination. The findings suggested that the differences in tea quality between the inner and outer mountain regions are related to isoleucine, leucine, phenylalanine, and valine contents, with a correlation coefficient of more than 0.85. Principal component analysis combining with support vector machine was a feasible method. The identification rates for the inner and outer mountains were 97.96% in the training set and 95.83% in the prediction set. Furthermore, the identification rates for the three counties were 91.84% and 95.83% in the training and prediction sets, respectively.

Extracting Information and Enhancing the Quality of Separation Data: A Review on Chemometrics-Assisted Analysis of Volatile, Soluble and Colloidal Samples

“…Carabetta et al [110] used a pulsed amperometric detector (PAD) following an HPLC analysis to characterize the sugar content of honeys and discriminate them by botanical and geographical origin by PCA and LDA. Su et al [111] used PCA and Hierarchical CA (HCA) to discriminate the geographical origins of Chinese green tea based on amino acid, polyphenol and caffeine content that were quantified by HPLC-UV, demonstrating that amino acids are very important for such discrimination. Campmajó et al [112] worked on a hen-egg matrix, applying PLS-DA to HPLC-UV profiles to classify eggs in four groups, according to their production method: organic, free-range, barn or caged.…”

Exploring the Quality and Application Potential of the Remaining Tea Stems after the Postharvest Tea Leaves: The Example of Lu’an Guapian Tea (Camellia sinensis L.)

“…Tea ( Camellia sinensis ), a traditional beverage that originated in China, has a wide range of consumers among different ages, places, cultures, societies, etc., due to its unique flavor and healthy benefits [ 1 ]. Green tea, the most widely consumed tea in China, can benefit human health because of its chemical composition, which includes atechins, theanine, and caffeine [ 2 , 3 , 4 , 5 ].…”

Rat plasma protein binding of kaempferol‐3‐ O ‐rutinoside from Lu’an GuaPian tea and its anti‐inflammatory mechanism for cardiovascular protection

“…Lu’an GuaPian tea, mainly produced in Lu’an City, Anhui Province, is one of the top 10 famous teas in China (Su et al., 2019). Flavonoids and flavonol glycosides (FGs) have attracted attention due to their contribution to the taste and bioactivity of tea.…”