Heat resistance of Desulfotomaculum nigrificans spores in soy protein infant formula preparations

Author:

Donnelly L S,Busta F F

Abstract

The heat resistance of Desulfotomaculum nigrificans spores was determined in soy protein infant formula preparations. Methods of sporulation were developed and evaluated. D. nigrificans spores of highest heat resistance were produced in a 40% infusion of spent mushroom compost. Fraction-negative D121 degrees C-values obtained in modified soy formula were 25.8 min for spores of ATCC 7946 produced at 55 degrees C and 54.4 min for an isolate designated RGI 1, which was sporulated at 66 degrees C. From the fraction-negative D-values, z-values were obtained of 6.7 degrees C for ATCC 7946 and 9.5 degrees C for RGI 1. Survivor-curve D121 degrees C-values were 5.6 min for ATCC 7946 and 2.7 min for RGI 1 sporulated at 55 degrees C and heated in modified soy formula. Corresponding D121 degrees C-values in Butterfield phosphate buffer (pH 7.2) were 3.3 min (ATCC 7946) and 1.1 min (RGI 1). The z-values generated from survivor-curve D-values were similar to those obtained by using fraction-negative procedures. In all instances the inactivation kinetics appeared to be linear. The isolate designated RGI 1, when sporulated at 66 degrees C and heated in a modified infant soy formula, exhibited an extraordinary heat resistance far in excess of previous reports.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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1. Spent Mushroom Substrate Uses;Edible and Medicinal Mushrooms;2017-08-14

2. Biocorrosion of dental alloys due to Desulfotomaculum nigrificans bacteria;ACTA BIOENG BIOMECH;2016

3. Biocorrosion of 316LV steel used in oral cavity due toDesulfotomaculum nigrificansbacteria;Journal of Biomedical Materials Research Part B: Applied Biomaterials;2015-10-14

4. Anaerobic sporeformers and their significance with respect to milk and dairy products;International Journal of Food Microbiology;2015-03

5. Heat Sterilization;Russell, Hugo & Ayliffe's;2012-12-17

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