EVALUATION OF QUALITY AND PROCESSING OF GREEN TEA LEAF

摘要

PURPOSE:To enable accurate evaluation of quality and manufacture of a product with a stable quality by a method wherein green tea leaf is dried below a fixed moisture level and a content component thereof is measured by a near infrared spectrochemical analysis while a specified production process is determined by the resulting content of the green tea leaf. CONSTITUTION:A green tea leaf (sample) is sampled and dried to reduce until moisture is down below 20% and then, it is crushed to be adjusted in particle size with a sieve ranging from 0.4-0.2 mm. Then, the sample is irradiated with near infrared rays by a near infrared spectrochemical analyzer to determine absorptivity thereof and a content component, a characteristic value or a sensory quality of a green tea leaf from the absorptivity thus obtained. Moreover, manufacturing methods for a rough tea process and a firing process as production process of tea are determined by the content component of the green tea leaf. With such an arrangement, objective evaluation of quality is possible free from external factors, which moreover, facilitates accurate section of a production process to match an amount of components contained actually and a desired product. This enables a producer to evaluate quality accurately and a manufacturer to turn out a product with a stable quality.