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Dynamics of active fluorescent units (AFU) and water activity (aw) changes in probiotic products—pilot study

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cris.virtual.author-orcid0000-0002-9477-8563
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cris.virtualsource.author-orcid73a2e591-ad92-47ae-b1e4-3eb06ca9d58f
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dc.abstract.enThe flow cytometry method (FCM) is a widely renowned practice increasingly used to assess the microbial viability of probiotic products. Additionally, the measurement of water activity (aw) can be used to confirm the presence of viable cells in probiotic products throughout their shelf lives. The aim of this study was to investigate the correlation between changes in aw and variations in active fluorescent units (AFU), a unit commonly used in flow cytometry method, during the aging of probiotic products containing freeze-dried bacteria. We controlled the stability of probiotic products for bacterial counts (using ISO 19344 method) and aw levels in commercially available capsules containing freeze-dried bacteria such as Lactobacillus sp. or combinations of Lactobacillus sp. and Bifidobacterium sp. in standard conditions (25 ± 2 °C and 60% relative humidity) over a period of 24 months. During this time, the bacterial contents decreased by 0.12 Log10 in the single-strain product, by 0.16 Log10 in the two-strain product and by 0.26 Log10 in the multi-strain product. With the increase in aw, the number of bacteria decreased but the aw at the end point of the stability study did not exceed 0.15 in each of the three tested products. FCM combined with aw is a prospective analysis that can be used to assess the stability of probiotic products, both for its ability to detect bacterial viability and for practical (analysis time) and economic reasons.
dc.affiliationWydział Nauk o Żywności i Żywieniu
dc.affiliation.instituteKatedra Biotechnologii i Mikrobiologii Żywności
dc.contributor.authorSielatycka, Katarzyna
dc.contributor.authorŚliwa-Dominiak, Joanna
dc.contributor.authorRadaczyńska, Martyna
dc.contributor.authorJuzwa, Wojciech
dc.contributor.authorKaczmarczyk, Mariusz
dc.contributor.authorMarlicz, Wojciech
dc.contributor.authorSkonieczna-Żydecka, Karolina
dc.contributor.authorŁoniewski, Igor
dc.date.access2025-06-23
dc.date.accessioned2025-10-01T05:36:58Z
dc.date.available2025-10-01T05:36:58Z
dc.date.copyright2023-11-03
dc.date.issued2023
dc.description.abstract<jats:p>The flow cytometry method (FCM) is a widely renowned practice increasingly used to assess the microbial viability of probiotic products. Additionally, the measurement of water activity (aw) can be used to confirm the presence of viable cells in probiotic products throughout their shelf lives. The aim of this study was to investigate the correlation between changes in aw and variations in active fluorescent units (AFU), a unit commonly used in flow cytometry method, during the aging of probiotic products containing freeze-dried bacteria. We controlled the stability of probiotic products for bacterial counts (using ISO 19344 method) and aw levels in commercially available capsules containing freeze-dried bacteria such as Lactobacillus sp. or combinations of Lactobacillus sp. and Bifidobacterium sp. in standard conditions (25 ± 2 °C and 60% relative humidity) over a period of 24 months. During this time, the bacterial contents decreased by 0.12 Log10 in the single-strain product, by 0.16 Log10 in the two-strain product and by 0.26 Log10 in the multi-strain product. With the increase in aw, the number of bacteria decreased but the aw at the end point of the stability study did not exceed 0.15 in each of the three tested products. FCM combined with aw is a prospective analysis that can be used to assess the stability of probiotic products, both for its ability to detect bacterial viability and for practical (analysis time) and economic reasons.</jats:p>
dc.description.accesstimeat_publication
dc.description.bibliographyil., bibliogr.
dc.description.financepublication_nocost
dc.description.financecost0,00
dc.description.if4,7
dc.description.number21
dc.description.points140
dc.description.versionfinal_published
dc.description.volume12
dc.identifier.doi10.3390/foods12214018
dc.identifier.issn2304-8158
dc.identifier.urihttps://sciencerep.up.poznan.pl/handle/item/5101
dc.identifier.weblinkhttp://www.mdpi.com/2304-8158/12/21/4018
dc.languageen
dc.relation.ispartofFoods
dc.relation.pagesart. 4018
dc.rightsCC-BY
dc.sciencecloudnosend
dc.share.typeOPEN_JOURNAL
dc.subject.enprobiotics
dc.subject.enflow cytometry
dc.subject.enactive fluorescent units
dc.subject.enstability of probiotic products
dc.subject.enbacterial enumeration
dc.titleDynamics of active fluorescent units (AFU) and water activity (aw) changes in probiotic products—pilot study
dc.typeJournalArticle
dspace.entity.typePublication
oaire.citation.issue21
oaire.citation.volume12