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Proteinase and peptidase specific activities of crude cell-free extracts of some lactic acid bacterial strains [electronic resource].

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Shehata, A. E

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Language: English Summary language: Arabic Description: p.543-560Other title:

الأنشطة النوعيه لانزيمات البروتينيز والبيتيديز فى المستخلصات الانزيميه لبعض سلالات بكتريا حمض اللاكتيك [Added title page title]

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Annals of agricultural science, 2003 v. 48 (2) [electronic resource].

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In: Annals of Agricultural Science 2003.v.48(2)Summary: Characterization and enzyme specific activities were determined in crude cell free extracts (CCFEs) acquired from Str. thermophilus ATCC 19987. Lb.casei ssp. casei ATCC 334, Lb.delbrueekii ssp. bulgaricus. ATCC 7995 and Lb.delbrueckii ssp. lactis ATCC 12315, subjected to beat-shocking (69°C/15 sec), freeze-shocking (-20°C/1 week) and grinding with alumina. Ultrastructural observations by electron microscopy reveal that cell wall physical damage, concomitantly occur with cell autolysis. Treating Lb. delbrueekii ssp. bulgaricus and L.b.delbrueckii ssp. lactis with heat-shock resulted in CCFEs having the highest concentration (2.548 and 2.714 mg/ml, respectively) of intracellular protein as compared with those of the other treatments.

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Characterization and enzyme specific activities were determined in crude cell free extracts (CCFEs) acquired from Str. thermophilus ATCC 19987. Lb.casei ssp. casei ATCC 334, Lb.delbrueekii ssp. bulgaricus. ATCC 7995 and Lb.delbrueckii ssp. lactis ATCC 12315, subjected to beat-shocking (69°C/15 sec), freeze-shocking (-20°C/1 week) and grinding with alumina. Ultrastructural observations by electron microscopy reveal that cell wall physical damage, concomitantly occur with cell autolysis. Treating Lb. delbrueekii ssp. bulgaricus and L.b.delbrueckii ssp. lactis with heat-shock resulted in CCFEs having the highest concentration (2.548 and 2.714 mg/ml, respectively) of intracellular protein as compared with those of the other treatments.

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