Judul: Peningkatan Pati Resisten Tepung Pisang Uli Modifikasi dengan Fermentasi Terkendali L. plantarum BSL dan Evaluasi Sifat Prebiotik
Abstrak: Resistant starch (RS) type 3 (RS3) is potential as prebiotic source due to its physiological function. The objectives of this study were to increase the RS3 level of modified uli banana flour (MUBF) made by controlled fermentation of lactic acid bacteria (LAB) L. plantarum BSL on sliced uli banana with a concentration of 104 CFU/ml and 106 CFU/ml at various fermentation times (0, 6, 12 and 24 h) followed by autoclaving-cooling. Evaluation of the prebiotic properties of RS3 MUBF was performed by testing the viability of three probiotic candidates i.e. L. plantarum BSL, B. bifidum and L. acidophilus in media m-MRSB (MRSB without glucose) and aquadest. Both media contained 2.5% RS3 isolated from MUBF. The results showed that concentration of L.plantarum BSL and fermentation times affected the RS3 content of MUBF. Fermentation for 12h with inoculum concentration at 106 CFU/ml produced the highest RS3 content in MUBF (32.57%). RS3 either derived from controlled or spontaneous fermentation could support the growth of probiotics. Higher growth were observed for RS3 produced by controlled fermentation (2.09-2.53 log CFU/ml) compared to spontaneous fermentation (1.52-1.80 log CFU/ml). Synbiotic yoghurt made of 70% MUBF (as skim milk substitution) and probiotic either B. bifidum or L. plantarum BSL still contain a fairly stable probiotic (109 CFU/ml) during four weeks of storage at 4°C temperature. Sensory evaluation showed that panelists could accept the product for its attributes such as color, flavor, texture, consistency and taste.
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Judul: Viabilitas Lactobacillus plantarum BSL dan L. acidophilus 2B4 Terenkapsulasi serta Mutu Yoghurt Tepung Pisang Sinbiotik selama Penyimpanan
Abstrak: Seventy percent of modified uli banana flour (MUBF) rich in resistant starch and encapsulated probiotic had been used to produce synbiotic yoghurt. The viability of encapsulated probiotics of synbiotic MUBF (Modified Uli- Banana Flour) yogurt were analyzed during 8 wk of storage and the sensory quality of yogurt was evaluated (quantitative descriptive and hedonic tests) by 9 trained panelists. Two species of probiotics (L. plantarum BSL and L. acidophilus 2B4) either with encapsulation (alginat and commercial agar) or without encapsulation (control) were added to sinbiotic MUBF yogurt and storage in refrigerator (5-10 ºC). Viability of probiotics in yogurt either encapsulated or control relatively stable (7 log CFU g-1) during 8 wk of storage. The pH of yogurt with encapsulated L. plantarum BSL was relatively stable (3.53-4.33) during storage, whereas L. acidophilus 2B4 decreased significantly (0.05-0.12). In general, total titratable acidity of yogurt showed inversely to the value of pH. The results of sensory evaluation by panelists showed that yogurt with alginate encapsulan was preferable to agar. Changes occurred on the sensory quality of synbiotic MUBF yogurt either with encapsulation or not were significantly different especially on the texture, aroma, and taste, but still accepted by the panelists at 5 wk of storage
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.