Determination of Iron-, Zlnc-, Copper-. Calcium-and Magnezium - Binding by Procyanidins from Bird-Resistant and Non-Bird-Resistant Sorghum Grain
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Date
1987-06
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Addis Ababa Universty
Abstract
Divalent -Fe, -Zn, -Cu, -Ca, and -Mg binding by
Sorghum procyanidins'(soluble and insoluble) has been
investigated. Both the soluble and insoluble fractions
of procyanidins bound Fe. Zn, and Cu, D~t not Ca and
Mg. Binding of the cations by the insoluble procyanidins
has been estimated as the difference in binding
between the Bird-Resistant (BR) and Non-Bird-Resistant
(NBR) NDP. Binding of Fe, Zn, and CU by procyanidins
was found to depend on pH, cation concentration, amount
of fiber, fiber particle size, and presence of competing
cations. The Binding of NDF from twenty one lines
of sorghum (16 BR and 5 NBR) was determined under
optimal conditions.
n new procedure was proposed to study mineral
binding by soluble sorghum procyanidins based on
dialysis. Cation binding by the soluble procyanidins
was determined based on tho difference in cation
concentration of the control and the cation solution
enuilibrated with the procyanidin solutio~ (after
dialysis). The trac" element cations were bound by
soluble procyanidins according to the orderĀ·
Fe > Zn , Cu A chelatc structure consisting of two fivemembered
rings has heen proposed for the cation
(Fe, Zn, eu) - procyanidin complexes.
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Keywords
Iron-, Zlnc-, Copper- Calcium- and magnezium - Binding