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巴西米纳斯吉拉斯州塞拉热尔地区的乳酸菌分析(MALDI-TOF-MS)及原料奶和新鲜手工奶酪的理化及微生物特性

Profile of lactic acid bacteria (MALDI-TOF-MS) and physico-chemical and microbiological characteristics of the raw milk and fresh artisanal cheese from Serra Geral, Minas Gerais, Brazil.

机构信息

Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31.270-901, Brasil; Departamento de Ciências Agrárias, Universidade Estadual de Montes Claros, Janaúba, Minas Gerais, 39.448-524, Brasil.

Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31.270-901, Brasil.

出版信息

Food Res Int. 2024 Jan;176:113831. doi: 10.1016/j.foodres.2023.113831. Epub 2023 Dec 7.

Abstract

Artisanal cheese from Serra Geral, Minas Gerais, Brazil, stands out for its cultural asset and socio-economic relevance. However, standards of identity and quality and the peculiar terroir associated with the edaphoclimatic conditions have not been established. Therefore, the production flow diagram and the physico-chemical and microbiological quality of the raw milk, pingo (natural starter culture), production benches, water and fresh cheese were investigated for the first time. In addition, lactic acid bacteria (LAB) from cheese and its production environment were identified by MALDI-TOF. For that, 12 cheese making facilities were selected. The raw milk and pingo showed adequate physico-chemical characteristics for cheesemaking; however, high microbial counts were found. In the water, total and thermotolerant coliforms were also identified. The fresh cheeses were classified as 'high moisture and fat' and 'soft mass'. Most physico-chemical parameters were satisfactory; however, there were high counts of total coliforms, Staphylococcus spp. and coagulase-positive staphylococci. There were high counts of LAB in the raw milk, pingo, bench surface and fresh cheese. A total of 84 microbial biotypes from MRS agar were isolated. Lactococcus lactis was the predominant LAB, followed by Lactococcus garvieae. Leuconostoc mesenteroides (benches), Leuconostoc pseudomesenteroides (fresh cheese), and Enterococcus faecium (pingo) were identified sporadically. These results indicate the risks to public health associated with the consumption of the fresh cheese, and measures to improve its safety are needed.

摘要

巴西米纳斯吉拉斯州塞拉杰拉尔的手工奶酪因其文化资产和社会经济重要性而脱颖而出。然而,其身份标准和质量标准以及与土壤气候条件相关的特殊风土尚未确定。因此,首次调查了原奶、平戈(天然发酵剂)、生产台、水和新鲜奶酪的生产流程图以及理化和微生物质量。此外,通过 MALDI-TOF 鉴定了奶酪及其生产环境中的乳酸菌 (LAB)。为此,选择了 12 家奶酪生产设施。原奶和平戈的理化特性适合奶酪制作,但微生物计数较高。水中还鉴定出总大肠菌群和耐热大肠菌群。新鲜奶酪被归类为“高水分和高脂肪”和“软质块状”。大多数理化参数令人满意,但总大肠菌群、金黄色葡萄球菌和凝固酶阳性葡萄球菌的计数较高。原奶、平戈、台面和新鲜奶酪中均有大量 LAB 存在。从 MRS 琼脂中分离出 84 种微生物生物型。乳球菌属是主要的 LAB,其次是乳球菌属 garvieae。肠膜明串珠菌(台面)、肠膜明串珠菌假肠膜亚种(新鲜奶酪)和粪肠球菌(平戈)偶尔被鉴定出来。这些结果表明,食用新鲜奶酪存在公共卫生风险,需要采取措施提高其安全性。

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