HCl-extractability of zinc and copper as affected by soaking, dehulling, cooking and germination of high yielding pigeon pea cultivars
2004
Duhan, A. | Khetarpaul, N. | Bishnoi, S.
The unprocessed seeds of four high yielding cultivars of pigeon pea namely ICPL-87, ICPL-151, UPAS-120 and Manak contained 2.06 to 2.64 and 1.45 to 2.14 mg per 100 g zinc and copper, respectively. Various domestic processing and cooking viz. soaking in water (6, 12, 18 h), soaking (12 h)¡dehulling, ordinary (cooking done in crude fibre beakers containing water (80°C) until soft as felt between the fingers) as well as pressure cooking of unsoaked, soaked (12 h) and soaked (12 h)-dehulled seeds and germination (24, 36 and 48 h) enhanced the HCl-extractability of zinc and copper, an index of their bioavailability to a remarkable extent. Among all the methods, soaking and dehulling could bring about maximum improvement (21-28%) in HCl-extractability of zinc followed by germination for 48 h (18-19%) and germination for 36 h as well as pressure cooking of soaked-dehulled seeds (16-18%) in descending order. Copper extractability could be enhanced to the maximum extent i.e. 3-4% over the control when the seeds of all the four cultivars were germinated for 36-48 h (3-4%) or soaked¡dehulled seeds were cooked in an ordinary way or pressure-cooked (3-4%). A significant (P<0.05) negative correlation was noticed with antinutrients viz. phytic acid, polyphenols, saponins and trypsin inhibitors with copper and zinc extractability in the processed and cooked pigeon pea seeds.
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