scholarly journals Assessment of Microbiological Quality and Physicochemical Parameters of Fruhe Made by Ovine and Goat Milk: A Sardinian (Italy) Cheese

Fermentation ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 119
Author(s):  
Marco A. Murgia ◽  
Pietrino Deiana ◽  
Anna Nudda ◽  
Fabio Correddu ◽  
Luigi Montanari ◽  
...  

Fruhe (Casu axedu) is a fresh cheese, traditionally manufactured in Sardinia (Italy) from sheep or goat milk, characterized by a compact coagulum obtained from raw or heat-treated whole milk. The objective of this study was to investigate the microbiological quality and physicochemical parameters of the sheep and goat Fruhe types of cheese at 21 days of cold storage. Chemical analyses showed that all Fruhe cheese samples were characterized by a pH below 4.4 and a variable content of total solid (22.75–21.06 g/100 g) proteins (5.4–10 g/100 g) and fat (3.9–15.7 g/100 g). The average residual lactose content was 2.6 g/100 g, while lactic acid content was 1.8 g/100 g. Microbial analyses revealed a high number of Lactic Acid Bacteria for both thermophilic and mesophilic streptococci (9 log CFU/g), and no pathogenic bacteria were found. The content of Free Amino Acids and Free Fatty acids point out that a good activity of rennet and microbial enzymes occurred, although Fruhe cheese is not subject to a ripening process. The present research reports the microbiological and nutritional characteristics of the sheep and goat Fruhe cheese that could represent the basis for further investigations, needful to improve its nutritional quality and to preserve its peculiarities.

2021 ◽  
Vol 10 (3) ◽  
pp. 157-167
Author(s):  
Thomas Bintsis

The microbiology of Kasseri cheese, a Protected Designation of Origin (PDO) cheese of pasta-filata type was studied in order to identify the dominant species and strains that may contribute to the maturation process. Chemical composition and microbiological quality of Kasseri cheese samples from two different dairies during the maturation was studied at 0, 7, 25, 60 and 90 days of the maturation. Lactic acid bacteria and Enterococcus spp. were found to be the dominant microflora in fresh cheese. P. pentosaceous and P. acidilactici, E. hirae, E. faecium, E. durans and E. gallinarium, together with facultatively heterofermentative lactobacilli were found to be the dominant microflora. Since these strains are dominating the microflora of Kasseri cheese during maturation, the enzymic system need to be further studied in order to select the proper strains for adjunct culture in Kasseri cheese.


LWT ◽  
2020 ◽  
Vol 130 ◽  
pp. 109670
Author(s):  
Lorena Soares Xavier ◽  
Gustavo Henrique Coelho Carvalho ◽  
Robert Oliveira Amaro ◽  
Arthur Pompilio da Capela ◽  
Regina Célia Santos Mendonça ◽  
...  

2018 ◽  
Vol 51 (2) ◽  
pp. 134
Author(s):  
N. SOULTOS (Ν. ΣΟΥΛΤΟΣ) ◽  
A. ABRAHIM (Α. ΑΜΠΡΑΧΙΜ) ◽  
E. THEOLOGIDOU (Ε. ΘΕΟΛΟΓΙΔΟΥ) ◽  
Pr. KARAIOANNOGLOU (ΠΡ. ΚΑΡΑΪΩΑΝΝΟΓΛΟΥ) ◽  
A. KANSOUZIDOU (Α. ΚΑΝΣΟΥΖΙΔΟΥ)

A survey was conducted to evaluate the microbiological quality of sliced, vacuumpacked, surimi-based imitation crab at the retail level, during a 3-month storage period. The roll shaped product imported from France, was sliced and packed in a fishery processing plant in the region of Thessaloniki. Twenty five samples were examined each month, and a total of 75 samples were examined during the three month storage period of the product. Psychrotropic, lactic acid and coliform bacteria, Escherichia coli I, yeasts, Staphylococcus aureus, Salmonella spp., Listeria spp. and Escherichia coli Θ157:Η7, were used as microbial indices, to evaluate the microbiological quality of the product. The following conclusions were derived from the evaluation of the results of the microbiological examinations. 1) The microbiological condition of the crab meat analogs examined on the 15th day of storage, was found satisfactory, since microbial populations were very low, while pathogenic bacteria were not detected in any of the examined samples. 2) The overall microbiological quality of the samples examined at the end of the second month of storage, was also good, since psychrotrophic and lactic acid bacteria exceeded 1Θ7 log cfu/g only in one sample), while coliform bacteria were not detected in 60% of the samples and Escherichia coli I was detected only in one sample. The mean value of the yeasts was 2.84 log cfu/g, while molds were not detected in any of samples examined. 3) The microbiological quality of the samples examined at the end of the three months storage period was not satisfactory, since the microbial indices in the majority of the samples (80%), were rather high. S. aureus, Salmonella spp, Listeria s pp. and E. coli 0157:H7 were not detected in any sample, during the three month storage period.


2020 ◽  
Vol 8 (8) ◽  
pp. 1199
Author(s):  
Daniela Bassi ◽  
Simona Gazzola ◽  
Eleonora Sattin ◽  
Fabio Dal Bello ◽  
Barbara Simionati ◽  
...  

Lactic acid bacteria (LAB) have a strong mitigation potential as adjunct cultures to inhibit undesirable bacteria in fermented foods. In fresh cheese with low salt concentration, spoilage and pathogenic bacteria can affect the shelf life with smear on the surface and packaging blowing. In this work, we studied the spoilage microbiota of an Italian fresh cheese to find tailor-made protective cultures for its shelf life improvement. On 14-tested LAB, three of them, namely Lacticaseibacillus rhamnosus LRH05, Latilactobacillus sakei LSK04, and Carnobacterium maltaromaticum CNB06 were the most effective in inhibiting Gram-negative bacteria. These cultures were assessed by the cultivation-dependent and DNA metabarcoding approach using in vitro experiments and industrial trials. Soft cheese with and without adjunct cultures were prepared and stored at 8 and 14 °C until the end of the shelf life in modified atmosphere packaging. Data demonstrated that the use of adjunct cultures reduce and/or modulate the growth of spoilage microbiota at both temperatures. Particularly, during industrial experiments, C. maltaromaticum CNB06 and Lcb. rhamnosus RH05 lowered psychrotrophic bacteria of almost 3 Log CFU/g in a 5-week stored cheese. On the contrary, Llb. sakei LSK04 was able to colonize the cheese but it was not a good candidate for its inhibition capacity. The combined approach applied in this work allowed to evaluate the protective potential of LAB strains against Gram-negative communities.


2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Wanda Aulya ◽  
Fadhliani Fadhliani ◽  
Vivi Mardina

Water is the main source for life and also the most severe substance caused by pollution. The mandatory parameters for determining microbiological quality of drinking water are total non-fecal Coliform bacteria and Coliform fecal (Escherichia coli). Coliform bacteria are a group of microorganisms commonly used as indicators, where these bacteria can be a signal to determine whether a water source has been contaminated by bacteria or not, while fecal Coliform bacteria are indicator bacteria polluting pathogenic bacteria originating from human feces and warm-blooded animals (mammals) . The water inspection method in this study uses the MPN (Most Probable Number) method which consists of 3 tests, namely, the presumption test, the affirmation test, and the reinforcement test. The results showed that of 15 drinking water samples 8 samples were tested positive for Coliform bacteria with the highest total bacterial value of sample number 1, 15 (210/100 ml), while 7 other samples were negative. From 8 positive Coliform samples only 1 sample was stated to be negative fecal Coliform bacteria and 7 other samples were positive for Coliform fecal bacteria with the highest total bacterial value of sample number 1 (210/100 ml).


2011 ◽  
Vol 131 (5) ◽  
pp. 395-400 ◽  
Author(s):  
Toru Oi ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita

Author(s):  
J Aquarista Ingratubun ◽  
Frans G Ijong ◽  
Hens Onibala

Food fermentation is one of various food processing techniques that has sufficient benefits of nutrition values, and also contains lactic acid bacteria which potentially inhibit pathogenic bacteria, thus prolong shelf life of  products. Bakasang is a traditional fermented food from North Sulawesi since many years ago. Reported research of bakasang previously had described that lactic acid bacteria was the dominant isolates and therefore current research  aimed to isolate and identify the lactic acid bacteria which associated during fermentation day 1 and day 15, respectively. Raw materials used were 5 kg intestine and liver of skipjack brought from local market Bersehati Manado. The intestine and liver of skipjack were washed and smashed and mixed with 10% salt  and 5% rice  from weight of the samples and then filled into bottle to be fermented for 15 days. Every 3 days (1,3,6,9,12,15), the samples were collected and analyzed for total lactic acid bacteria by using Total Plate Count Method on de Mann Rogosa Sharpe Agar after incubation at 37°C for 24 h. The colonies  grown were transferred to Tryptic Soy Broth and followed by streaking them on Tryptic Soy Agar and the free growing colony on agar medium were isolated into slant agar which were used for biochemical test such as Gram’s staining, motility test, catalase test, oksidase test, H2S test, IMVIC test (Indole, Methyl Red, Voges Proskauer, Citrate) and carbohydrate fermentation. The results showed that Lactobacillus sp., Bacillus sp., Eubacterium sp., and Bifidobacterium sp. All these four bacteria were distributed from day 1 to day 15 of the fermentation process© Fermentasi bahan pangan merupakan salah satu dari sekian banyak teknik pengolahan makanan yang mempunyai banyak manfaat dari kualitas gizi, mengandung bakteri asam laktat sehingga menghambat bakteri patogen sehingga daya simpan lebih panjang. Bakasang merupakan makanan fermentasi tradisional masyarakat Sulawesi Utara yang sudah ada sejak lama. Penelitian yang telah dilakukan terhadap bakasang menghasilkan informasi bahwa terdapat bakteri asam laktat pada bakasang sehingga menjadi tujuan untuk mengisolasi dan identifikasi bakteri asam laktat selama proses fermentasi 1-15 hari. Bahan baku bakasang ialah jeroan (usus dan hati) ikan cakalang Katsuwonis pelamis sebanyak 5 kg yang diambil dari pasar Bersehati Manado. Sampel jeroan dibersihkan kemudian dihancurkan, ditambahkan garam 10% dan nasi 5% kemudian difermentasi selama 15 hari dengan mengambil tiap-tiap sampel setiap 1, 3, 6, 9, 12, dan 15 untuk dihitung jumlah bakteri asam laktat dengan menggunakkan metode Total Plate Count pada media de Mann Rogosa Sharpe Agar dan koloni yang tumbuh di tumbuhkan  kembali pada media Tryptic Soy Broth  dan digores kembali pada media Tryptic Soy Agar, koloni yang tumbuh digores pada media slant agar yang selanjutnya diidentifikasi bakteri asam laktat berdasarkan uji biokimia yaitu uji pewarnaan Gram, uji motility, uji katalase, uji oksidase, uji H2S dan uji IMVIC (Indole, MethylRed, Voges Proskauer, Citrate). Hasil menunjukkan bahwa selama proses fermentasi berlangsung terdapat 4 genera bakteri asam laktat sesuai yaitu Lactobacillus sp., Bacillus sp., Eubacterium sp., dan Bifidobacterium sp., ke 4 genera ini tersebar pada fermentasi hari 1 sampai hari ke 15©


Domiati cheese is the most popular brand of cheese ripened in brine in the Middle East in terms of consumed quantities. This study was performed to investigate the impact of the microbiological quality of the used raw materials, the applied traditional processing techniques and ripening period on the quality and safety of the produced cheese. Three hundred random composite samples were collected from three factories at Fayoum Governorate, Egypt. Collected samples represent twenty-five each of: raw milk, table salt, calf rennet, microbial rennet, water, environmental air, whey, fresh cheese, ripened cheese & swabs from: worker hands; cheese molds and utensils; tanks. All samples were examined microbiologically for Standard Plate Count (SPC), coliforms count, Staphylococcus aureus (S. aureus) count, total yeast & mould count, presence of E. coli, Salmonellae and Listeria monocytogenes (L. monocytogenes). The mean value of SPC, coliforms, S. aureus and total yeast & mould counts ranged from (79×102 CFU/m3 for air to 13×108 CFU/g for fresh cheese), (7×102 MPN/ cm2 for tank swabs to 80×106 MPN/ml for raw milk), (9×102 CFU/g for salt to 69×106 CFU/g for fresh cheese) and (2×102 CFU/cm2 for hand swabs to 60×104 CFU/g for fresh cheese), respectively. Whereas, E. coli, Salmonella and L. monocytogenes failed to be detected in all examined samples. There were significant differences in all determined microbiological parameters (p ≤0.05) between fresh and ripened cheese which may be attributed to different adverse conditions such as water activity, pH, salt content and temperature carried out to improve the quality of the product.


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