Journal
DRYING TECHNOLOGY
Volume 19, Issue 9, Pages 2331-2341Publisher
MARCEL DEKKER INC
DOI: 10.1081/DRT-100107502
Keywords
HPLC; non-thermal drying; organic acids; sugars; ascorbic acid; chlorophyll
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An alternating current high electric field (HEF) of 430 kV/m generated by multiple point-to-plate-electrodes was used to dry spinach (Spinacia oleracea L). Point electrodes distributed above a layer of fresh spinach were effective in removing moisture. Drying continuously for 7 h removed 80.1 % of the total moisture compared with 79.8% and 19.3% when dried in an oven (60 degreesC) and in ambient air (25 degreesC), respectively. The Hunter 'a' value for HEF-dried samples maintained most of the original green color compared with oven-drying, during which the spinach turned brown. Total chlorophyll (Chl), Chl a and Chl b contents in spinach were substantially higher after HEF-drying than oven-drying. The ascorbic acid content after six weeks of storage of the dried material was almost three times higher in HEF-dried samples than those oven-dried. HPLC determinations of organic acids and sugars indicated no formation of by-products in post-HEF-dried spinach.
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