Journal
DRYING TECHNOLOGY
Volume 24, Issue 1, Pages 51-56Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373930500538675
Keywords
ginger drying; retention of 6-gingerol; heat pump drying; modified atmosphere heat pump drying; freeze drying; vacuum drying
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A heat pump dryer using normal air, nitrogen, and carbon dioxide was selected to dry sliced West Indian ginger (Zingiber officinale Roscoe) rhizome (3 mm in thickness). The drying characteristics were compared with each other and inert gas heat pump drying showed an improved effective diffusivity. Quantities of the main pungent principle (6-gingerol) of ginger, extracted from these dried samples, were determined by high-pressure liquid chromatography (HPLC). The evaluation included dried samples obtained by heat pump, modified atmosphere heat pump, freeze drying, and vacuum drying. Retention of 6-gingerol increased in the order of normal air drying, freeze drying, nitrogen drying, carbon dioxide drying, and vacuum drying. From this point of view, inert gas also showed a better retention of flavor compared to most other types of drying.
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