Background;Yoghurt is a product obtained from pasteurized milk, then fermented with certain bacteria to acidity, distinctive odor and flavor, without any other ingredients. The process of making fermentation yogurt for + 8 hours which produces lactic acid bacteria (BAL). Lactic Acid Bacteria (BAL) is one of the good factors in the human immune system. Objective; This study aims to determine the type of lactic acid bacteria and total acid bacteria in yogurt with the content of sucrose and skim milk. Materials and Methods; Research experiment with Completely Randomized Design (RAL) on product A1 (10 gram sucrose and 200 ml skim milk), A2 (sucrose 20 gram and 200 ml skim milk), A3 (sucrose 30 gram and 200 ml skim milk) using Total method Plate Count (TPC). Results; The result of bacteria is lactobacillus that is gram positive bacterium in the form of basil, cell wall is violet color and has long peptidoglycan layer (20-80 nm). In total lactic acid bacteria was obtained the amount of A1 product was 6,924 log cfu / ml, A2 was 7,006 log cfu / ml, A3 was 7.054 log cfu / ml. Conclusion; The higher the variation of sucrose and skim milk, the activity of lactic acid bacteria is higher because it is influenced by the presence of sucrose which is the source of carbon for the growth of microorganism and the existence of skim milk as a source of nitrogen and the source of nutrients exploited for the growth of lactic acid bacteria. ABSTRAKPendahuluan; Yoghurt merupakan produk yang diperoleh dari susu yang telah dipasteurisasi, kemudian difermentasi dengan bakteri tertentu sampai diperoleh keasaman, bau dan rasa yang khas, tanpa penambahan bahan lain. Dimana pada proses pembuatan yoghurt fermentasi selama + 8 jam yang menghasilkan bakteri asam laktat (BAL). Bakteri Asam Laktat (BAL) merupakan bakteri baik yang berperan dalam sistem imun manusia. Tujuan; Penelitian ini bertujuan untuk mengetahui jenis bakteri asam laktat dan total bakteri asam pada yoghurt dengan variasi sukrosa dan susu skim. Bahan dan Metode; Penelitian eksperimen dengan Rancangan Acak Lengkap (RAL) pada produk A1 (sukrosa 10 gram dan susu skim 200 ml), A2 (sukrosa 20 gram dan susu skim 200 ml), A3 (sukrosa 30 gram dan susu skim 200 ml) dengan menggunakan metode Total Plate Count (TPC). Hasil; Hasil penelitian didapatkan jenis bakteri yaitu lactobacillus yaitu bakteri gram positif yang berbentuk basil, dinding selnya menyerap warna violet dan memiliki lapisan peptidoglikan yang tebal (20-80 nm). Pada total bakteri asam laktat didapatkan jumlah produk A1 sebesar 6,924 log cfu/ml, A2 sebesar 7,006 log cfu/ml, A3 sebesar 7,054 log cfu/ml. Kesimpulan; Semakin tinggi variasi sukrosa dan susu skim maka aktivitas bakteri asam laktat semakin tinggi karena dipengaruhi dengan adanya sukrosa yang merupakan sumber karbon untuk pertumbuhan mikroorganisme Journal of The World of Nutrition
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