Date Received: 02-07-2025
Date Published: 02-07-2025
##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2016.14.10.
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SOME RESEARCH RESULTS ON THE SPRAY DRYING STAGES OF PROCESS TECHNOLOGY FOR PRODUCING SOLUBLE GREEN TEA POWDER FROM FRESH TEA LEAVES3
,
Giang Trung Khoa
,
Pham Duc Nghia
Keywords
Soluble tea powder, fresh tea, extraction, old tea leaves
Abstract
Soluble tea powder is produced by drying the concentrated extraction dried tea leaves (green tea, black tea or oolong). The products of this method have a good quality but are expensive and require lots of energy. This paper introduces some research results on the spray drying stages of process technology for producing soluble green tea powder from fresh old tea leaves. The effects of the spray drying process variables (spray drying temperature: 160 - 1800C, drying agent velocity: 2 - 5m/s, and atomization air pressure: 5 - 20psi) on the total polyphenol, catechin, caffeine, and liquor sensory characteristics have been investigated. The quality of the soluble green tea powder was at an acceptable level for total polyphenol components (29.84 - 30.26% dry matter (DM)), caffeine (5.19 - 5.25%DM), total catechins (13.04 - 13.56%DM), and had good liquor sensory characteristics. The results of the study contribute to improving the process technology for producing soluble green tea powder from fresh old tea leaves, reducing production costs, and supplying materials for the food processing industry.
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