The original aroma compounds responsible for the fresh ginger flavor were isolated by Amberlite XAD-2 chromatography. Ginger oil was isolated by hydrodistillation from fresh ginger. Fresh ginger was dried and the oil was isolated by hydrodistillation from dry ginger (sun-dried and drier-dried). The oils were analyzed by GC and GC/MS. It was found that geranial (24.2%) and zingerone (14.2%) were the major compounds in the original aroma of fresh ginger and their contents decreased during processing. It was observed that the hydrocarbon content of the oil increased and the oxygenated compounds decreased as ginger was processed into dry ginger and ginger oil.
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Menon et al. (2007) studied this question.
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