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.
Original language | English |
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Pages (from-to) | 1112-1118 |
Number of pages | 7 |
Journal | Journal of Food Science |
Volume | 66 |
Issue number | 8 |
DOIs | |
State | Published - 2001 |
Externally published | Yes |
Keywords
- Amaranthus
- Betacyanins
- Pigment degradation
- Postharvest treatments
- Visible/near infrared spectroscopy