Production, partial optimization and characterization of keratinase enzyme by Arthrobacter sp. NFH5 isolated from soil samples. Keratinase is an inducible enzyme that is synthesized only when an inducer ( keratin) appears in the environment. Keratinase can be produced by many kinds of. The three Bacillus spp. produced extracellular keratinases and of feather or feather meal on the production of keratinolytic enzymes by three.

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Int J Environ Sustain Dev. The ability of a microorganism to degrade keratin and the resulting levels of keratinase produced vary according to the specie, chemical composition, the molecular structure of keratin substrates, and the culture conditions [ 3132 ].

The hydrolysate of keratinous proteins i. By this way, the shrink proofing of wool surface can be obtained. The three strains produced serine peptidases with keratinase and gelatinase activity.

Microorganisms isolated in this study present potential for biotechnological uses. The production of keratinase by bacterial inoculums was studied by considering the media components and culture conditions.

Sources As early as the beginning of the 19th century, people discovered that some organisms could degrade keratin, and the separation of such strains has been ongoing since then.

Microbial Keratinase Production and Application to Improve the Properties of Wool Fabrics

Screening the keratinase positive bacteria Keratinase positive bacteria were cultured on skim milk snzyme and feather meal agar plates. Degradative products profile of keratinase fermentation like sulphur rich compounds cysteine, cystine [ 24 ], and methionine [ 25 ], total inorganic sulphur released [ 26 ], and amount of free amino acids [ 27 ] was estimated using the methods specified, respectively.


Yeast extract as organic N 2 source and potassium nitrate as inorganic N 2 sources gave the maximum amount of enzyme production.

Preparation of Inoculum Streptomyces sp. Zymograms The kerqtinase culture supernatant was mixed with the peptidase sample buffer [Tris-HCl 0. Received Jan 21; Accepted Aug 1.

Afr J Microbiol Res. Temperature, pH and other culture parameters play vital role for enzyme production.


Enzyme production in shake flask cultures The keratinase enzyme production was carried out in the basal medium by using shaking flask. Subsequently dyeing, the fabrics were rinsed with water and then dried at room temperature.

We denoted the isolate as Arthrobacter sp. The degenerative keratin protein is gradually hydrolyzed into polypeptides, oligopeptides and free amino acids by the action of polypeptide hydrolase.

Among them Arthrobacter sp. Keratinqse bacterial isolates were further sub-cultured to obtain pure culture. The supernatant was the source of enzymatic extract and was used for keratinase and gelatinase activity assays and in the zymographic and enzymographic analysis. Some fungi reduce the disulfide bonds through the sulfites secreted on the surface of the mycelia and the acidic environment, while Streptomyces through the production of intracellular reductase.


A potential beta-keratin degrading bacteria from Vellore Emu feather dumped soil. A drop of water was allowed to fall from a fixed height onto the taut surface of a test specimen. Table of Contents Alerts. Published online Sep Finally, the fabric was rinsed several times with deionized water to remove any remaining enzyme from the treatment.

Useful enzymes for bioprocessing agroindustrial wastes and beyond, Food Bioprocess. Diverse groups of microorganisms are reported to produce keratinase like fungi Doratomyces microsporusAlternaria radicinaTrichurus spiralisAspergillus sp.

No significant difference was observed in the keratinolytic activity when B. Consent for publication Not applicable. Further biochemical characterization was carried out adopting standard tests as described in Collee et al. The liquor to fabric ratio was Felting and shrinkage are the major problems for wool fabrics.

Keratinase – Creative Enzymes

This was determined in the culture supernatants according to Lowry et al. At the end of the fermentation, the remaining solid material was removed after centrifugation at 5.

Similarly, preferred pH 8.

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