Effect of postharvest treatments on Amaranthus betacyanin degradation evaluated by visible/near-infrared spectroscopy

Y. Z. Cai, H. Corke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 languageEnglish
Pages (from-to)1112-1118
Number of pages7
JournalJournal of Food Science
Volume66
Issue number8
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Amaranthus
  • Betacyanins
  • Pigment degradation
  • Postharvest treatments
  • Visible/near infrared spectroscopy

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