Abstract
ABSTRACT: A visible/near‐infrared spectrophotometric method was developed for betacyanin and moisture content in Amaranthus samples. A standard error of prediction (SEP) of 0.25 mg/g for betacyanins (r2= 0.97) and 2.18% for moisture (r2= 0.99) was obtained on the validation sample set. Effect of 5 postharvest treatments on betacyanin degradation was assessed. Freeze‐drying and ‐18°C frozen storage gave over 97% pigment retention, compared to natural air (52.8%), solar drying (63.5%), air oven drying (61.9 to 83.1%), and 14°C storage (78.3%). Air‐drying gave the lowest degradation rate and longest half‐life among the solar and oven‐drying treatments for 8 h. Dried samples showed good pigment stability with 28.6 mo half‐life at 25°C.
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