차광한 차나무 잎의 엽위별 생육특성 및 차 품질 관련 주요 화학성분을 분석한 결과는 다음과 같다. 하위엽으로 내려 갈수록 엽장, 엽폭, 백아중은 컸으나 엽수분은 감소하였다. 하위엽으로 내려갈수록 total nitrogen, caffeine, vitamin C, saponin 함량은 감소하였고, total amino acid, chlorophyll 함량은 4번 엽과 3번엽에서 각각 최대함량을 나타냈다. tannin은 $9.53{sim}11.24%$로 1엽이 11.24%로 함량이 제일 많았고 4엽이 9.53%로 가장 적었다. fatty acid는 2엽에서 3,594mg/100g으로 함량이 가장 많았고, 5엽에서 2,782mg/100g으로 함량이 가장 적었다. 포화지방산인 palmitic acid와 steatic acid는 5엽에서 함량이 많았고, 불포화 지방산인 oleic acid, linoleic acid, linolenic acid는 2엽에서 함량이 많았다. 이상 분석 결과로부터 15일간 차광한 후 채엽한 가루녹차 원료는 5엽까지 채취하여 제다해도 품질에 있어서 큰 문제가 없다고 생각된다.
The significant chemical components estimating the quality and growth characteristics in different parts of tea plants were compared and analyzed in the shoots of shading tea plants. The results are summarized as follows. The leaves length, leaves width and weigth of 100 buds in the leaves were increased with growing, while the leaf moisture was decreased. The contents of total nitrogen, caffeine, vitamin C and saponin in the leaves were decreased with growing, while those of total amino acid and chlorophyll were the highest in the 4th leaves and in 3rd leaves, respectively. The content of tannin ranged from 9.53% to 11.23%. The content of tannin at the 1st leaves was the highest as 11.24%, but that of the 4th leaves was the lowest as 9.53%. the content of fatty acid at the 2nd leaves was the highest as 3,594mg/100g, and that of the 5th leaves was the lowest as 2,782mg/100g. The contents of palmitic acid and stearic acid were the highest in the 5th leaves, but those of oleic acid, linoleic acid and linolenic acid were the highest at the 2nd leaves. In conclusion, the 5th leaves among tea shoots plucked after shading for 15 days could be used to manufacture powder green tea.
