Proximate Analysis and Antioxidant Properties of Young Plants of Sinapis alba L. Depend on the Time of Harvest and Variety

White mustard plant (Sinapis alba L.) is an easy-to-grow species with low soil requirements and often sown as a catch crop in Northern Europe to reduce nitrate leaching, especially during the winter. There are studies showing high nutritional value of seeds, which have wide application, mainly food production. Still little known about young shoots or plants different cultivars white mustard, although Asian countries, eating them raw quite common. The aim research was determine proximate composition, antioxidant activity polyphenolic compound content green Polish mustard: Borowska (traditional, erucic acid glucosinolates), Bamberka (non-erucic glucosinolates) Warta glucosinolates content; double-improved). Young were harvested three terms. first harvest took place at plover stadium next ones 7-day intervals (31, 38 45 day after sowing). In freeze-dried material, composition ABTS FRAP methods, well phenolic content, measured. highest concentration protein measured 31 days sowing. Harvest time cultivar affected total polyphenol plants. Thirty-eight sowing, examined had content. Green strong properties basic level, they classified functional foods similar other edible leafy such celery, spinach Brussels sprouts.