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An Alternative Pathway for the Formation of Aromatic Aroma Compounds Derived From L-Phenylalanine via Phenylpyruvic Acid in Tea (Camellia Sinensis (L.) O. Kuntze) Leaves

An Alternative Pathway for the Formation of Aromatic Aroma Compounds Derived From L-Phenylalanine via Phenylpyruvic Acid in Tea (Camellia Sinensis (L.) O. Kuntze) Leaves

Xiaoqin Wang, Lanting Zeng, Yinyin Liao, Ying Zhou, Xinlan Xu, Fang Dong, Ziyin Yang

Food Chem. 2019 Jan 1;270:17-24.

PMID: 30174031

Abstract:

Aromatic aroma compounds contribute to flavor of tea (Camellia sinensis (L.) O. Kuntze) and they are mostly derived from l-phenylalanine via trans-cinnamic acid or directly from l-phenylalanine. The objective of this study was to investigate whether an alternative pathway derived from l-phenylalanine via phenylpyruvic acid is involved in formation of aroma compounds in tea. Enzyme reaction with phenylpyruvic acid showed that benzaldehyde, benzyl alcohol, and methyl benzoate were derived from phenylpyruvic acid in tea leaves. Feeding experiments using [2H8]l-phenylalanine indicated that phenylpyruvic acid was derived from l-phenylalanine in a reaction catalyzed by aromatic amino acid aminotransferases (AAATs). CsAAAT1 showed higher catalytic efficiency towards l-phenylalanine (p ≤ 0.001) while CsAAAT2 showed higher catalytic efficiency towards l-tyrosine (p ≤ 0.001). Both CsAAATs were localized in the cytoplasm of leaf cells. In conclusion, an alternative pathway for the formation of aromatic aroma compounds derived from l-phenylalanine via phenylpyruvic acid occurred in tea leaves.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP156069	Phenylpyruvic acid		156-06-9	Price

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