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Analysis of Leaf utilization wolfberry Tea Based on Sensory Evaluation and Metabolomics

1, 1, 1, 1,1, 1,1, 1, 1,1,Bi-Ying SHI1, 1,   

  • Received:2023-08-08 Revised:2023-10-17 Online:2023-10-20 Published:2023-10-20

Abstract: The sensory quality and metabolites of 26 varieties (lines) of Leaf utilization wolfberry buds and fresh leaves were analyzed using sensory review and metabolomics techniques combined with multivariate statistical analysis. The results of sensory evaluation showed that the dried leafy wolfberry buds had a mellow, fresh and sweet flavor. The LC-MS results showed that a total of 879 metabolites were identified in Leaf utilization wolfberry buds, including 10 classes of amino acids and their derivatives, flavonoids, phenolic acids, sugars, nucleotides and their derivatives, lignans and coumarins, alkaloids, terpenoids, organic acids, and lipids. According to the VIP>1 and p<0.05 of PLS-DA model, 211 differential metabolites were screened, which were mainly enriched into the metabolic pathways of linoleic acid metabolism, flavonoid biosynthesis, flavonoids and flavonols biosynthesis, phenylpropanol biosynthesis, and galactose metabolism, etc. The results of PLS-DA double labeling map and classification heat map showed that amino acids and their derivatives, flavonoids, sugars and lipids were the important components for distinguishing the metabolites of different varieties (lineages) of Leaf utilization wolfberry buds, which had the potential to be suitable for the production of white and green teas. PLSR correlation analysis showed that 26 metabolites, including L-theanine, β-alanyl-L-arginine, epicatechin, isoquercitrin, rutin, palmitoleic acid, and cornflower 3-O-rutinoside 5-O-β-D-glucoside, collectively affected the flavors of Leaf utilization wolfberry buds such as mellow, thick, fresh, sweet, and bitter. The results of sensory evaluation combined with PLSR analysis showed that seven Leaf utilization wolfberry, including N1, N9, Z90, Z68, Q3, Q6-13 and Z48, were characterized by better sensory quality and rich in internal components. In this study, sensory review and metabolomics were used for quality evaluation, which provided theoretical support for the selection of 26 varieties (lines) of Leaf utilization wolfberry varieties and the screening of suitable tea types.

Key words: Leaf utilization wolfberry, sensory evaluation, metabolomics, suitability, Differential metabolites