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Melatonin, phenolics content and antioxidant activity of germinated selected legumes and their fractions

Saleh, Hend M., Hassan, Amal A., Mansour, Esam H., Fahmy, Hany A., El-Bedawey, Abo El-Fath A.
Journal of the Saudi Society of Agricultural Sciences 2019 v.18 no.3 pp. 294-301
Cicer arietinum, Lens culinaris, Lupinus albus, Phaseolus vulgaris, Trigonella foenum-graecum, Vicia faba, antioxidant activity, chickpeas, cotyledons, faba beans, fenugreek, gallic acid, hulls, lentils, melatonin, quercetin, seed germination, seeds, sensory properties
This study was aimed to evaluate the effects of germination process on melatonin, total phenols, total flavonoids and antioxidant activities of broad beans (Vicia faba L.), lupine seeds (Lupinus albus), chickpea seeds (Cicer arietinum L.), lentil seeds (Lens culimaris), fenugreek seeds (Trigonella foenum-graecum L.) and common beans (Phaseolus vulgaris) fractions (cotyledons, radicles and seed hulls). Radicle length of germinated legumes and sensory properties of legumes after 6days of germination were also evaluated. Fenugreek and chickpea seeds had higher melatonin (54.22 and 24.42ng/g), total phenols (5.79 and 5.68mg gallic acid/g) and total flavonoids (8.86 and 8.43mg quercetin/g), respectively than other legumes however, common beans showed the lowest values. Broad beans and lentil seeds had the highest antioxidant activities while lupine seeds showed the lowest value among all other legumes. The mean values of melatonin for cotyledons, radicles and seed hulls were increased by 386.26, 261.98 and 183.22%, respectively compared with the third day of germination. The increases in melatonin content of legume fractions were parallel to the increases in radicle lengths, total phenols, total flavonoids and antioxidant activities throughout the germination time. Overall acceptability of legumes had rating scores ranged between like moderately and like very much except for chickpea which had rating score described as like slightly.