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2020, vol. 24, iss. 1, pp. 35-38
The effect of osmotic dehydration and starch coating on the microbiological stability of apples
aUniversity of Novi Sad, Faculty of Technology
bInstitute for Food Technology, Novi Sad
cInstitute of General and Physical Chemistry, Belgrade
Osmotic dehydration of food - energy and ecological aspects of sustainable production (MESTD - 31055)

Keywords: apple; osmotic dehydration; molasses; starch coating; microbial profile
This paper examines the effect of starch coating and the osmotic dehydration in sugar beet molasses on the microbiological stability of apples. One-half of the osmotically treated/untreated apples were protected by starch coating, resulting in four sample groups (namely the K, P, OD and OD+P sample groups). E. coli, Salmonella spp. and Listeria monocytogenes were not detected in any of the samples. Enterobacteria were present in the K and P samples in the first four days (indicating a downward trend), but were not subsequently detectable. The total number of microorganisms (TVC) was found to be uniform in each sample group. However, the TVC values were significantly higher in the K and P sample groups than those of the OD and OD + P samples. Yeasts and molds were detected in the K and P samples, whereas the presence of yeasts and molds in the OD and OD+P samples was confirmed only after four days of storage. The results obtained indicate that osmotic dehydration is a suitable method for maintaining microbial stability, whereas starch coating did not justify its purpose.
*** (2008) SRPS ISO 16649-2: Mikrobiologija hrane i hrane za životinje - horizontalna metoda za određivanje broja b - glukuronidaza pozitivne Escherichia coli - tehnika brojanja kolonija na 44 °C pomoću 5-bromo-4-hloro-3 indolil b-D-glukuronida. Deo 2
*** (2017) SRPS EN ISO 21528-2: Mikrobiologija hrane i hrane za životinje - horizontalna metoda za otkrivanje i određivanje broja Enterobacteriaceae - metoda brojanja kolonija - temperatura inkubiranja je 37 °C. Deo 2
*** (2011) SRPS ISO 21527-2: Mikrobiologija hrane I hrane za životinje - horizontalna metoda za određivanje broja kvasaca I plesni - tehnika brojanja kolonija u proizvodima sa aktivnošću vode manjom od ili jednakom 0,95. Deo 2
*** (2017) SRPS EN ISO 6579-1: izuzev Aneksa D: Mikrobiologija hrane i hrane za životinje - horizontalna metoda za otkrivanje, određivanje broja i serotipizaciju Salmonella spp. - otkrivanje Salmonella spp. Deo 1
*** (2017) SRPS EN ISO 11290-1: Mikrobiologija hrane i hrane za životinje - horizontalna metoda za otkrivanje i određivanje broja Listeriamonocytogenes i Listeria spp. - metoda otkrivanja - temperatura inkubiranja u delu potvrđivanje L. monocytogenes je 37°C. Deo 1
*** (2014) SRPS EN ISO 4833-1: Mikrobiologija lanca hrane - horizontalna metoda za određivanje broja mikroorganizama - brojanje kolonija na 30 °C tehnikom nalivanja ploče. Deo 1
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article language: English
document type: Original Scientific Paper
DOI: 10.5937/jpea24-25505
published in SCIndeks: 16/05/2020

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