[The Effect of a Supplement of Microbial Phytase on Zinc Availability]

Overview

Journal Z Ernahrungswiss

Specialty Nutritional Sciences

Date 1992 Dec 1

PMID 1337230

Citations 4

Authors

G Rimbach

J Pallauf

Affiliations

Soon will be listed here.

Abstract

A study of 35 (5 x 7) male, individually housed, albino rats (initial average weight = 50 g) was undertaken to examine the effect of an addition of microbial phytase to a diet containing phytate on the availability of zinc. The rats were fed a semisynthetic diet based of egg white and cornstarch over a 3-week period. All diets were supplemented with 20 mg Zn/kg. Group I (control) was fed the basal diet free of phytic acid (PA) and phytase. By replacing cornstarch by Na-phytate (0.5% in group II and 1.0% group III), molar phytate: Zn ratios of 25 and 50:1 were obtained, respectively. In groups IV (0.5% PA) and V (1.0% PA) 1000 U of microbial phytase were added. A molar phytate:Zn ratio of 25 (group II) and 50:1 (group III) resulted in a dose-dependent depression of growth and feed efficiency ratio. These negative effects of the addition of PA could be completely counteracted by the supplementation of 1,000 U of phytase in group IV and partially so in group V. Similarly, the apparent absorption and retention of Zn, Zn-concentration in femur and testes and different Zn-status-parameters in plasma (Zn-concentration, percent unsaturated plasma-Zn binding capacity, activity of alkaline phosphatase) were improved by adding 1,000 U microbial phytase/kg diet. The present study shows that an addition of microbial phytase to phytate-rich diets considerably improves the availability of Zn in growing rats.

Citing Articles

Phytase: sources, preparation and exploitation.

Dvorakova J Folia Microbiol (Praha). 1998; 43(4):323-38.

PMID: 9821286 DOI: 10.1007/BF02818571.

[Zinc--update of an essential trace element].

Rimbach G, Markant A, Pallauf J, Kramer K Z Ernahrungswiss. 1996; 35(2):123-42.

PMID: 8766885 DOI: 10.1007/BF01622861.

Enhancement of zinc utilization from phytate-rich soy protein isolate by microbial phytase.

Rimbach G, Pallauf J Z Ernahrungswiss. 1993; 32(4):308-15.

PMID: 8128752 DOI: 10.1007/BF01611169.

Dietary effect of phytogenic phytase and an addition of microbial phytase to a diet based on field beans, wheat, peas and barley on the utilization of phosphorus, calcium, magnesium, zinc and protein in piglets.

Pallauf J, Rimbach G, Pippig S, Schindler B, Hohler D, Most E Z Ernahrungswiss. 1994; 33(2):128-35.

PMID: 8079507 DOI: 10.1007/BF01622225.

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