期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 97, 期 10, 页码 3211-3219出版社
WILEY
DOI: 10.1002/jsfa.8167
关键词
antioxidant activity; bioactive compounds; drying models; maturity; steam-microwave blanching; Thunbergia laurifolia leaves
资金
- Royal Golden Jubilee Ph.D. Scholarship
- Thailand Research Fund
- Office of the Higher Education Commission
BACKGROUNDDried Thunbergia laurifolia leaves are usually prepared using tray drying, resulting in products that have lost substantial amounts of bioactive compounds and antioxidant activity. The maturity of the raw material, blanching techniques and drying methods were investigated in order to select the best condition to produce high qualities of dried T. laurifolia leaves. RESULTSThe 1st stage of maturity was selected and steam-microwave blanching (SMB) for 4min was adequate for blanching leading to the maximum recovery of bioactive compounds. The modified Halsey model was the best desorption isotherm model. A new drying model proposed in this study was the best to fit the drying curves as compared to five common drying models. Moisture diffusivities were increased with the increase of drying temperature when combining SMB and heat pump-dehumidified drying. Microwave heat pump-dehumidified drying (MHPD) provided the shortest drying time, high specific moisture extraction rate (SMER) and could reduce drying time by 67.5% and increase caffeic acid and quercetin by 51.24% and 60.89%, respectively. CONCLUSIONMHPD was found to be the best drying method and provided the highest antioxidant activity and bioactive compounds content, high SMER and short drying time. (c) 2016 Society of Chemical Industry
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