Institute for Milk Hygiene, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, 1210 Vienna, Austria.
Landwirtschaftskammer Vorarlberg, 6900 Bregenz, Austria.
Int J Food Microbiol. 2014 Jun 16;180:88-97. doi: 10.1016/j.ijfoodmicro.2014.04.010. Epub 2014 Apr 13.
"Vorarlberger Bergkäse" (VB) is an Austrian artisanal hard cheese produced from raw cow's milk. The composition of its rind microbiota and the changes in the microbial communities during ripening have not previously been investigated. This study used 16S and 18S rRNA gene cloning and sequencing to characterize the bacterial and fungal communities of seven pooled cheese rind samples taken in seven different ripening cellars of three Austrian dairy facilities. A total of 408 clones for 16S and 322 clones for 18S rRNA gene libraries were used for taxonomic classification, revealing 39 bacterial and seven fungal operational taxonomic units (OTUs). Bacterial OTUs belonged to four different phyla. Most OTUs were affiliated to genera often found in cheese, including high numbers of coryneforms. The most abundant OTU from 16S rRNA gene libraries showed highest similarity to Halomonas. Young cheese rinds were dominated by Actinobacteria or Proteobacteria, particularly by Halomonas and Brevibacterium aurantiacum, while Staphyloccocus equorum was most abundant in old cheeses. The most abundant 18S rRNA OTU had highest similarity to the filamentous fungus Scopulariopsis brevicaulis. Pairwise correlation analyses revealed putative co-occurrences between a number of OTUs. It was possible to discriminate the different cheese rind microbiota at the community-level by facility affiliation and ripening time. This work provides insights into the microbial composition of VB cheese rinds and might allow the processing- and ripening conditions to be improved to enhance the quality of the product.
“福拉尔贝格山地奶酪”(VB)是一种奥地利传统手工硬奶酪,由生牛乳制成。其干酪外皮的菌群组成以及成熟过程中微生物群落的变化尚未得到研究。本研究使用 16S 和 18S rRNA 基因克隆和测序技术,对来自三个奥地利乳制品工厂的七个不同成熟地窖中的七个 pooled 奶酪外皮样本的细菌和真菌群落进行了研究。总共对 16S 和 18S rRNA 基因文库中的 408 个克隆和 322 个克隆进行了分类,共发现了 39 个细菌和 7 个真菌分类操作单元(OTUs)。细菌 OTUs 属于四个不同的门。大多数 OTUs 与奶酪中常见的属有关,包括大量棒状杆菌。16S rRNA 基因文库中最丰富的 OTU 与盐单胞菌属(Halomonas)具有最高的相似性。年轻奶酪外皮主要由放线菌或变形菌纲组成,尤其是盐单胞菌属(Halomonas)和短杆菌属(Brevibacterium aurantiacum),而老奶酪中则以葡萄球菌属(Staphyloccocus equorum)最为丰富。最丰富的 18S rRNA OTU 与丝状真菌 Scopulariopsis brevicaulis 具有最高的相似性。成对相关分析显示,许多 OTUs 之间存在潜在的共同出现。通过设施归属和成熟时间可以区分不同的奶酪外皮微生物群落。这项工作深入了解了 VB 奶酪外皮的微生物组成,可能有助于改进加工和成熟条件,提高产品质量。
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