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Glucosinolates in Broccoli Sprouts (Brassica oleracea var. italica) as Conditioned by Sulphate Supply during Germination

Author:
Pérez-Balibrea, Santiago, Moreno, Diego A., García-Viguera, Cristina
Source:
Journal of food science 2010 v.75 no.8 pp. C673
ISSN:
0022-1147
Subject:
seed germination, sprouts (food), application timing, broccoli, plant nutrition, sprouting, phytochemicals, sowing, Brassica oleracea var. italica, fertilizer rates, seedlings, secondary metabolites, sulfur fertilizers, health foods, glucosinolates
Abstract:
Sulphur (S) fertilization is essential for primary and secondary metabolism in cruciferous foods. Deficient, suboptimal, or excessive S affects the growth and biosynthesis of secondary metabolites in adult plants. Nevertheless, there is little information regarding the influence of S fertilization on sprouts and seedlings. An experiment was set up to evaluate the effect of S fertilization, supplied as K2SO4 at 0, 15, 30, and 60 mg/L, on the glucosinolate content of broccoli sprouts during the germination course of 3, 6, 9, and 12 d after sowing. Glucosinolate concentration was strongly influenced by germination, causing a rapid increase during the first 3 d after sowing, and decreasing afterwards. The S supply increased aliphatic and total glucosinolate content at the end of the monitored sprouting period. S-treated sprouts, with S15, S30, and S60 at 9 and 12 d after sowing presented enhanced glucosinolate content. Overall, both germination time and S fertilization were key factors in maximizing the bioactive health-promoting phytochemicals of broccoli. Germination with sulphate is a simple and inexpensive way to obtain sprouts that contain much higher levels of glucosinolates (health promoting compounds), than the corresponding florets from the same seeds.
Agid:
792967