3.1. Isolation of Strains of Lactic Acid Bacteria From
Traditional Dairy Products
In this study, all chemicals and cultivation mediums
were provided by Merck Co. Firstly, for isolation of the
strains, samples of traditional dairy products, including yogurt, curd, Tarhana and Ghareghoroot, were collected from the Markazi province. Secondly, the collected
samples were transported to the laboratory after coding.
Thirdly, samples were enriched using falcons containing
de Man, Rogosa and Sharpe Broth medium in an incubator at 37 ºC with atmospheric carbon dioxide. Tarhana
and curd samples have hard tissues, hence cannot be easily mixed with the cultivation medium. Thereby, these
samples were firstly dissolved in sodium citrate and were
then added to MRS broth medium (9). After enrichment,
bacteria were cultivated in MRS agar and incubated as
before (i.e. cultivation in MRS Broth medium). Grown
strains were isolated based on colony morphology and
catalase capability and were then coded (Table 1). Finally,
isolated strains were kept in 50% glycerol at 40 ºC until
complementary tests were performed.
3.1. Isolation of Strains of Lactic Acid Bacteria From
Traditional Dairy Products
In this study, all chemicals and cultivation mediums
were provided by Merck Co. Firstly, for isolation of the
strains, samples of traditional dairy products, including yogurt, curd, Tarhana and Ghareghoroot, were collected from the Markazi province. Secondly, the collected
samples were transported to the laboratory after coding.
Thirdly, samples were enriched using falcons containing
de Man, Rogosa and Sharpe Broth medium in an incubator at 37 ºC with atmospheric carbon dioxide. Tarhana
and curd samples have hard tissues, hence cannot be easily mixed with the cultivation medium. Thereby, these
samples were firstly dissolved in sodium citrate and were
then added to MRS broth medium (9). After enrichment,
bacteria were cultivated in MRS agar and incubated as
before (i.e. cultivation in MRS Broth medium). Grown
strains were isolated based on colony morphology and
catalase capability and were then coded (Table 1). Finally,
isolated strains were kept in 50% glycerol at 40 ºC until
complementary tests were performed.
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3.1. Isolation of Strains of Lactic Acid Bacteria From
Traditional Dairy Products
In this study, all chemicals and cultivation mediums
were provided by Merck Co. Firstly, for isolation of the
strains, samples of traditional dairy products, including yogurt, curd, Tarhana and Ghareghoroot, were collected from the Markazi province. Secondly, the collected
samples were transported to the laboratory after coding.
Thirdly, samples were enriched using falcons containing
de Man, Rogosa and Sharpe Broth medium in an incubator at 37 ºC with atmospheric carbon dioxide. Tarhana
and curd samples have hard tissues, hence cannot be easily mixed with the cultivation medium. Thereby, these
samples were firstly dissolved in sodium citrate and were
then added to MRS broth medium (9). After enrichment,
bacteria were cultivated in MRS agar and incubated as
before (i.e. cultivation in MRS Broth medium). Grown
strains were isolated based on colony morphology and
catalase capability and were then coded (Table 1). Finally,
isolated strains were kept in 50% glycerol at 40 ºC until
complementary tests were performed.
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