Shelf life study of some Nigerian fruit juices inoculated with ascospores ofNeosartorya spp.
- 83 Downloads
Mango, orange and pineapple juices containing various concentrations of sucrose were dispensed in 100 ml volumes into 100 ml conical flasks with stoppers. Each juice in a flask was inoculated with ascospores of one local isolate of eitherNeosartorya fischeri, N. fischeri var.spinosa orN. quadricincta to a final concentration of 120–140 ascospores/ml of juice, and then pasteurized at 80°C for 30 min. A set of 36 inoculated flasks with 12 controls was stored at 4–5°C and two sets, one protected with 100 mg/l sodium benzoate, were stored at room temperature (25–28°C). A shelf life study was carried out on all the juices for 64 days. Only fruit juices stored at 4–5°C and those containing sodium benzoate stored at room temperature were protected from spoilage by these fungi for 64 days. Addition of sucrose at levels of 9% to mango juice, 30% to pineapple juice and 31.5% to orange juice significantly (p=0.05) protected ascospores from inactivation during cold storage.
Key wordsMango Orange Pineapple juices Neosartorya spp Sodium benzoate Sucrose
Unable to display preview. Download preview PDF.
- 1.King AD, Michener HD, Ito KA (1969) Control ofByssochlamys and related heat-resistant fungi in grape products. Appl Microbiol 18: 166–173.Google Scholar
- 6.McEvoy IJ, Stuart MR (1970) Temperature tolerance ofAspergillus fischeri var.glaber in canned strawberries. Ir J Agric Res 9: 59–67.Google Scholar
- 7.Nielsen PV, Beuchat LR, Frisvad JC (1988) Growth of and fumitermorgin production byNeosartorya fischeri as affected by temperature, light and water activity. Appl Environ Microbiol 54: 1504–1510.Google Scholar
- 8.Okagbue RN (1989) Heat-resistant fungi in soil samples from Northern Nigeria. J Food Protect 52: 59–61.Google Scholar
- 12.Walpole RE (1974) Introduction to statistics, 2nd edn. New York: Macmillan.Google Scholar
- 13.Nielsen PV, Beuchat LR, Frisvad JC (1989) Growth and fumitremorgin production byNeosartorya fischeri as affected by food preservations and organic acids. J Appl Bacteriol 66: 197–207.Google Scholar
- 14.Patterson DS, Shreeve BJ, Roberts BA, Macdonald SM (1981) Verruculogen production by soil fungi in England and Wales. Appl Environ Microbiol 42: 916–917.Google Scholar