scholarly journals Review on lactic acid bacteria function in milk fermentation and preservation

2015 ◽  
Vol 9 (4) ◽  
pp. 170-175 ◽  
Author(s):  
Gemechu Teshome
2014 ◽  
Vol 05 (04) ◽  
pp. 435-442 ◽  
Author(s):  
Yantyati Widyastuti ◽  
Rohmatussolihat   ◽  
Andi Febrisiantosa

Food Control ◽  
2008 ◽  
Vol 19 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Pablo Álvarez-Martín ◽  
Ana Belén Flórez ◽  
Ana Hernández-Barranco ◽  
Baltasar Mayo

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Elizaveta Gavrilova ◽  
Elizaveta Anisimova ◽  
Alsu Gabdelkhadieva ◽  
Elena Nikitina ◽  
Adel Vafina ◽  
...  

Abstract Background Raw milk, meat and plant materials are subjected to high risks of contamination by various pathogenic bacteria and thus their growth prevention is a great challenge in the food industry. Food fermentation by lactic acid bacteria (LAB) besides changing its organoleptic characteristics also helps to eliminate unfavorable microflora and represses growth of pathogens. To the date only few LABs has been reported to exhibit activity against bacteria embedded in the biofilms characterized by extreme resistance to antimicrobials, high exchange rate with resistance genes and represent high risk factor for foodborne disease development. Results Six novel LAB strains isolated from the clover silage exhibited pronounced antibacterial activity against biofilm embedded pathogens. We show explicitly that these strains demonstrate high acidification rate, completely repress the growth of E. coli, S. aureus and to a lesser extent P. aeruginosa as well as exhibit appropriate probiotic and milk-fermenting properties. Moreover, in contrast to the approved probiotic strain Lactobacillus plantarum 8PA3, the new isolates were able to efficiently eradicate preformed biofilms of these pathogens and prevent bacterial spreading originating from the biofilm. We suggest these strains as potential additives to the pre-cultures of conventional LAB strains as efficient tools targeting foodborne pathogens in order to prevent food contamination from either seeded raw material or biofilm-fouled equipment. Conclusions The AG10 strain identified as L. plantarum demonstrate attractive probiotic and milk fermentation properties as well as high resistance to simulated gastric conditions thus appearing perspective as a starter culture for the prevention of bacterial contamination originating from fouled equipment during milk fermentation.


2016 ◽  
Vol 30 (3) ◽  
pp. 155-172 ◽  
Author(s):  
Silvia Portilla-Vázquez ◽  
Ana Rodríguez ◽  
Mario Ramírez-Lepe ◽  
Patricia G. Mendoza-García ◽  
Beatriz Martínez

2016 ◽  
Vol 83 (3) ◽  
pp. 387-394 ◽  
Author(s):  
Stefano Morandi ◽  
Tiziana Silvetti ◽  
Alberto Tamburini ◽  
Milena Brasca

Oxidation-reduction potential (Eh) is a fundamental physicochemical property of lactic acid bacteria that determines the microenvironment during the cheese manufacture and ripening. For this reason the Eh is of growing interest in dairy research and the dairy industry. The objective of the study was to perform a comprehensive study on the reduction activity of wild lactic acid bacteria strains collected in different periods (from 1960 to 2012) from Italian dairy products. A total of 709 strains belonging to Lactococcus lactis, Enterococcus durans, E. faecium, E. faecalis and Streptococcus thermophilus species were studied for their reduction activity in milk. Kinetics of milk reduction were characterised by the minimum redox potential (Eh7) and time of reaching Eh7 (tmin), the maximum difference between two measures (Δmax) and the time at which these maximum differences occurred (t*). Broad diversity in kinetic parameters was observed at both species and strain levels. E. faecalis and L. lactis resulted to be the most reducing species, while S. thermophilus was characterised by the lowest reducing power while the greatest heterogeneity was pointed out among E. durans and E. faecium strains. Considering the period of collection (1960–2012) we observed that the more recently isolated strains generally showed less reducing activity. This trend was particularly evident for the species E. durans, E. faecium and L. lactis while an opposite trend was observed in E. faecalis species. Data reported in this research provide new information for a deeper understanding of redox potential changes during milk fermentation due to bacterial growth. Gain knowledge of the redox potential of the LAB cultures could allow a better control and standardisation of cheesemaking process.


2015 ◽  
Vol 17 (1) ◽  
pp. 56
Author(s):  
W Sayang Yupardhi ◽  
I G.L. Oka ◽  
Ayu Pratiwi ◽  
I N.S. Sutarpa ◽  
I N.S. Miwada

Abstract. A research for studying performances (aromatics including colour, taste, smell, texture and its financial benefit) of milk products i.e. yoghurt which used modern technology versus the natural one was conducted at PT Prima Rasa, Denpasar. The research consisted of two treatments (A = modern technology and B = natural technology). The objective of the research were: 1) to study the differences of aromatic and financial benefit of yoghurt with modern technology versus the natural one, 2) to use as a reference in the future on milk products business, and 3) to increase the quantity and quality of yoghurt and income per capita in the Bali Island. In this research, yoghurt production which used modern technology (treatment A) used some ingredients i.e. fresh milk, skimmed milk, starter (imported Lactic Acid Bacteria from Canada) and modern equipments i.e. electric incubator for milk fermentation. While the natural technology (treatment B) used a slightly different ingredients and equipments i.e. non imported starter and non electric incubator (ampel bamboo). The starter used was lactic acid bacteria naturally found in the ampel bamboo as incubator at once. The incubator was covered with aged banana leaf on the fermentation processes. These ingredients and equipments were very easy to find, available through the year and cheap. There were six replicates in each treatment. Data obtained were analyzed with t test and financial benefit was analyzed descriptively.  Results of the research showed that yoghurt aromatics which used natural technology was 14.29% significantly higher than modern one but its texture was 20.31% or significantly lower. The differences did not seem to cause difference on the taste between them. The average taste score was the same (7.1), indicating that both treatments had the same taste. The financial benefit of the natural yoghurt was much higher (90.74%) than that of the modern one (127.40% versus 10.80%). Key words: yoghurt, fresh milk, lactic acids bacteria, incubator, ampel bamboo Abstrak. Penelitian untuk mempelajari performans (cita-rasa termasuk: warna, aroma/bau, tekstur, keasaman/rasa asam/pH, dan finansial) suatu produk susu yaitu yogurt yang menggunakan teknologi modern versus alami (bambu ampel) telah dilakukan di PT Perusahaan Prima Rasa, Denpasar. Penelitian ini terdiri atas dua perlakuan (perlakuan A = teknologi modern, dan B = teknologi alami). Tujuan penelitian ini adalah untuk: 1) mempelajari perbedaan cita-rasa dan keuntungan finansial yogurt yang menggunakan teknologi modern dan alami, 2) dipakai sebagai acuan dalam membuat suatu usaha bisnis produk susu dimasa yang akan datang, dan 3) meningkatkan kuantitas dan kualitas yogurt serta pendapatan asli daerah Bali. Dalam penelitian ini pembuatan yogurt yang menggunakan teknologi modern (perlakuan A) menggunakan beberapa bahan-bahan dan alat-alat seperti susu sapi segar, skim, starter (bakteri asam laktat impor dari Kanada dan harganya mahal), inkubator listrik atau steroform untuk pemeramannya. Sedangkan pembuatan yogurt yang menggunakan teknologi alami (perlakuan B) prosesnya hampir sama dengan yang menggunakan teknologi modern, hanya saja tidak menggunakan starter impor dan tidak menggunakan inkubator listrik (menggunakan bamboo ampel) dan starter yang digunakan adalah bakteri asam laktat yang secara alami terdapat dalam bambu ampel tersebut. Bambu ampel yang digunakan sebagai inkubator itu ditutupi dengan daun pisang yang telah dilayukan. Bambu ampel ini mudah didapat, tersedia sepanjang tahun dan murah harganya. Masing-masing perlakuan diulang sebanyak enam kali. Data yang diperoleh dianalisa dengan t test, keuntungan finansial dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa yogurt dengan teknologi alami mempunyai aroma lebih kuat secara nyata sebesar 14,29% dibandingkan yogurt dengan teknologi modern, tetapi teksturnya (kelembutannya) adalah sebaliknya, yogurt dengan teknologi modern lebih tinggi secara nyata sebesar 20,31% dibandingkan derngan yogurt teknologi alami. Namun demikian, perbedaan tersebut tidak menyebabkan perbedaan rasa di antara semuanya. Dalam hal ini rata-rata nilai rasa adalah sama (7,1). Artinya, kedua perlakuan tersebut mempunyai rasa sama. Namun demikian, keuntungan dari hasil penjualan yogurt dengan teknologi alami lebih tinggi (90,74%) dibandingkan teknologi modern (127,40% versus 10,80%). Kata kunci : yogurt, susu sapi segar, bakteri asam laktat, inkubator, bambu ampel 


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