Decomposition and discoloration kinetics of L-ascorbic acid powders in superheated steam

Yuka Horagai, Lan hsin Hung, Yukitaka Kimura, Shuji Adachi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The decomposition and discoloration of powdery L-ascorbic acid in superheated steam were observed in the temperature range of 140-180 °C. For comparison, the decomposition and discoloration were also measured in the temperature range in hot air and at 180 °C in nitrogen. L-Ascorbic acid decomposed faster in superheated steam than in hot air. Discoloration was also more remarkable for the L-ascorbic acid treated in the superheated steam. The Weibull equation was applicable to the decomposition in both superheated steam and hot air. The early stage of discoloration was assumed to be expressed by zeroth-order kinetics. In the latter stage, fading occurred and the process was expressed by first-order kinetics which was modified to level off at a certain value.

Original languageEnglish
Pages (from-to)2113-2117
Number of pages5
JournalLWT - Food Science and Technology
Issue number10
Publication statusPublished - Dec 2008
Externally publishedYes


  • Decomposition
  • Discoloration
  • Kinetics
  • L-ascorbic acid
  • Superheated steam

ASJC Scopus subject areas

  • Food Science


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