Preventive Nutrition and Food Science

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Melatonin and Polyphenol Contents in Some Edible Sprouts (Alfalfa, Chicory, Rape, Red Kale and Sunflower)

  • Kim, Seok-Joong (Department of Food and Nutrition, Dongduk Women's University) ;
  • Cho, Moo-Ho (Department of Food Science and Technology, Catholic University of Daegu)
  • Received : 2011.05.04
  • Accepted : 2011.06.02
  • Published : 2011.06.30
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Abstract

The melatonin, total polyphenol contents, and DPPH radical scavenging activity were determined in alfalfa, chicory, rape, red kale and sunflower after germination for four days at $24{\pm}0.1^{\circ}C$. Compared with seeds, melatonin content was increased in all sprouts, at the highest level in red kale (2,502.9 pg/g, 5.6 times higher than seed) followed by rape (2,430.1 pg/g), chicory (2,037.7 pg/g), alfalfa (1,160.8 pg/g) and sunflower (768.2 pg/g) sprout, however, the addition of tryptophan (0.5 mM), the precursor of melatonin synthesis, did not show any desirable effect. Both polyphenol content and DPPH radical scavenging activity were substantially increased in chicory (8.7 mg/g, 66%), rape (10.7 mg/g, 51%) and red kale (11.0 mg/g, 53%) sprouts, but not in alfalfa and sunflower sprouts. Melatonin content per gram polyphenol (ng/g) was also increased in all sprouts through germination. Germination was effective in increasing melatonin in all seeds tested, while its effect on polyphenol content and DPPH radical scavenging activity was species dependent.

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