첫물차 노란잎과 녹색잎 자원의 아미노산 및 카테킨 함량 비교

Abstract

The tea plant leaves at the first harvest time have green, purple, yellow, and white colors. The tea plant with yellow tea leaves contained the albino tea germplasm at the Gurye-gun of Jeollanam-do in Korea. This study compared the chlorophyll, amino acid, and catechin contents at the first harvest time in tea plants with yellow leaf (YL) and green leaf (GL) by transplant and cultivation after cutting from the same site. The chlorophyll content of GL was 3.3 times higher than YL at the one bud two leaves of the first harvest time. The chroma of brightness (L), red (a), and yellow (b) were 1.4, 1.1, and 1.6 times higher in YL than in GL, respectively. On the other hand, the total amino acid was 41.0 ± 1.0 mg/g for YL and 16.0 ± 0.6 mg/g for GL, showing a 2.6 times higher amino acid content in YL than GL. The L-theanine content was also 3.0 times higher in the YL (25.8 ± 0.3 mg/g) than in the GL (8.7 ± 0.4 mg/g). The L-theanine content in the total amino acid was 62.9% for the YL and 54.4% for the GL. The other amino acid contents were 15.1 ± 0.7 mg/g for the YL and 7.3 ± 0.2 mg/g for the GL. The total catechin content was 8.96 ± 0.08 mg/g for the YL and 7.19 ± 1.22 mg/g for the GL. The (-)-epigallocatechin-3-gallate (EGCG) and (-)-epigallocatechin (ECG) contents were higher in the YL than in the GL. Nevertheless, the (-)-epigallocatechin (EGC) content of GL was 1.2 times higher than the YL. In conclusion, the YL is another cultivar compared to the GL because of its different leaf yellow color, high amino acid, and L-theanine contents than GL.