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Abstract:
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  1. Go, S.K., Chia, S.L., Tan, C.P., Chong, G.H.
    MyJurnal
    Traditional drying methods involve high temperatures that degrade heat-sensitive compounds.
    Dehumidified-air drying, an alternative to traditional drying methods, is suitable for heatsensitive
    compounds; however, it consumes a large amount of energy and is comparatively
    expensive. In this study, a multi-chamber dehumidified-air dryer was designed to dry Hydrocotyle
    bonariensis, and the retention of the polyphenol content of Hydrocotyle bonariensis under
    various drying conditions was examined. Multi-chamber dehumidified-air drying involves two
    chambers; each chamber was operated at temperatures of 30, 40, and 50o
    C with air volumetric
    flow rates of 30 and 50 L/min. The results indicated that the highest retention of total phenolic
    content and total flavonoid content, 24.67 mg of GAE/g dry weight (DW) and 2.204 mg of
    catechin/g DW, respectively, was obtained at 50o
    C with a 50 L/min air flow rate in the first
    drying chamber. Multi-stage dehumidified-air dryers have the potential to dry heat-sensitive
    products with reduced energy consumption.
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