Nature of Intestinal Phytase Activity.

Maddaiah, V.T.; Kurnick, A. A.; Hulett, B. J.; Reid, B. L.

doi:10.3181/00379727-115-29114

Cited by 24 publications

(14 citation statements)

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“…Vohra et al (1965), using titration curves to monitor free acid in the presence of a single cation, reported that phytate forms complexes with cations in the following descending order of strength: Cu 2+ > Zn 2+ >Co 2+ >Mn 2+ >Fe 3+ >Ca 2+ . In a similar study, Maddaiah et al (1964) found that at physiological pH, zinc formed the most insoluble salt with phytic acid. It is known that phytate lowers bioavailability of several nutritionally important minerals including calcium, magnesium, zinc and iron, thus, increasing these minerals requirement in animals.…”

Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 90%

“…Zinc becomes a limiting mineral in high phytate diets as it forms a highly insoluble complex at pH 6.0, which is the approximate pH of the upper intestine where most mineral absorption occurs (Maddaiah et al, 1964). The effect of phytate on zinc bioavailability in chicks has been demonstrated by several workers (Edwards, 1966;Lease, 1966).…”

Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 98%

“…Phytate is a strong acid and forms a wide variety of insoluble salts with divalent or trivalent cations at neutral pH (Oberleas, 1973), potentially rendering these elements unavailable for absorption (Maddaiah et al,1964;Vohra et al, 1965). Vohra et al (1965), using titration curves to monitor free acid in the presence of a single cation, reported that phytate forms complexes with cations in the following descending order of strength: Cu 2+ > Zn 2+ >Co 2+ >Mn 2+ >Fe 3+ >Ca 2+ .…”

Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 98%

“…Phytic acid has strong chelating potential to form a variety of complexes with cations (Ca, Mg, Zn, Mn and Cu), rendering them cations biologically unavailable (Maddaiah et al, 1964;Davies and Reid, 1979). When phytic acid is hydrolyzed by microbial phytase supplementation, variable amount of bound minerals are released.…”

Section: Availability Of Other Mineralsmentioning

confidence: 99%

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Significance of phytic acid and supplemental phytase in chicken nutrition: a review

Singh¹

2008

World's Poultry Science Journal

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Phytic acid is an anti-nutritional constituent of plant derived feeds. As a reactive anion, it forms a wide variety of insoluble salts with minerals including phosphorus, calcium, zinc, magnesium and copper. Phytic acid is also known to form complexes with protein and proteolytic enzymes (pepsin and trypsin). Because of the lack of endogenous phytase enzymes that hydrolyze phytic acid; phosphorus, calcium, protein and other phytic acid bound nutrients are less available to poultry. Commercially-available microbial phytase has great nutritional significance and ecological importance. Poultry diets supplemented with microbial phytase result in improved growth performance and increased digestibility and availability of phytate bound phosphorous, calcium, zinc and copper. Microbial phytase supplementation has also been shown to increase ileal digestibility of crude protein and amino acids. The efficacy of supplemental microbial phytase depends on its rate of inclusion, dietary calcium and phosphorus ratio, vitamin D 3 , nature of diet, age and genotype of birds. Thus, microbial phytase can be used to exploit the inherent nutritional potential of feedstuffs for more economic and environmentallyfriendly poultry production.

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Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 90%

Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 98%

Section: Phytate and Minerals Bio-availabilitymentioning

confidence: 98%

Section: Availability Of Other Mineralsmentioning

confidence: 99%

See 2 more Smart Citations

Significance of phytic acid and supplemental phytase in chicken nutrition: a review

Singh¹

2008

World's Poultry Science Journal

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“…T h e phytate story is inextricably mixed with that of rickets and with the early history of vitamin D, and it began with the demonstration by Mellanby (1920) that cereals, especially oats, are rachitogenic for puppies. It was not until 1934 that Bruce & Callow (1934), working on low-P rickets in rats, provided the key to this mystery.…”

Section: Symposium Proceedings I965mentioning

confidence: 99%

The availability of the calcium and phosphorus of plant materials for animals

Taylor

1965

Proc. Nutr. Soc.

126

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Differential developmental pattern of acid and alkaline phytase and phosphatase activities in rat intestine

Bhandari

1979

Experientia

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Rat intestine was found to show a distinct acid phytase activity (pH optimum 4.7) in addition to that of an alkaline phytase (pH optimum 8.0). The phytase and phosphatase activities were found to differ in their developmental pattern and responded differentially to some inhibitors. Thus the two activities seem to be due to two independent enzymes and are not the activity of a nonspecific phosphatase as has been suspected formerly.

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Nature of Intestinal Phytase Activity.

Cited by 24 publications

References 1 publication

Significance of phytic acid and supplemental phytase in chicken nutrition: a review

Significance of phytic acid and supplemental phytase in chicken nutrition: a review

The availability of the calcium and phosphorus of plant materials for animals

Differential developmental pattern of acid and alkaline phytase and phosphatase activities in rat intestine

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