IDENTIFIKASI GENETIK LACTOBACILLUS DALAM FERMENTASI AIR CUCIAN BERAS DENGAN PCR (POLYMERASE CHAIN REACTION

Bakteri asam laktat (BAL) sangat baik digunakan dalam pencegahan efek samping bakteri patogen. Bakteri ini termasuk dalam golongan bakteri baik dan menguntungkan yang memiliki peranan besar untuk mencegah dan mengurangi pertumbuhan bakteri patogen. Sisa air cucian beras terkandung kikisan dari karbohidrat sehingga dapat digunakan BAL untuk berkembangbiak. Fermentasi air cucian beras diidentifikasi untuk mengetahui kandungan BAL spesifik yang terdapat didalamnya menggunakan Polymerase Chain Reaction (PCR). Identifikasi ini dilakukan menggunakan tahapan-tahapan metode yang dimulai dari pencarian isolat murni, uji aktivitas antimikroba, uji katalase, ekstraksi DNA, siklus PCR dan elektroforesis gel agarosa. Hasil penelitian terbentuk pita pada kisaran 300 bp yang artinya kedua primer terdeteksi dikarenakan Lactobacillus casei berada pada 254 bp sedangkan Lactobacillus rhamnosus berada pada 159 bp pada fermentasi air cucian beras

SIMPLE AND RAPID METHOD FOR ISOLATING ANTHOCYANIN FROM WILD MULBERRY (Morus nigra L.)

Wild mulberry (Morus nigra L.) is a kind of berries that has a high content of anthocyanin pigment. Anthocyanin is a natural pigment that has good biological activity so that widely be used as both food and drug ingredients. There are many studies conducted that have isolation anthocyanin from mulberry extract, but most of them used various expensive methods and the process included several steps that make them not cost-effective nor time-efficient. This research was conducted in order to do an isolation of anthocyanin from wild mulberry through a single step. The extraction of compounds was done by maceration and the isolation was done by thin layer chromatography method. The isolation product was identified with reagents, consisting of ferric chloride and sodium hydroxide, and with spectrophotometry methods, consisting of UV-Vis and infrared spectrophotometry. As result, this research was able to isolate anthocyanin from wild mulberry fruit by thin layer chromatography method. The identification with spectrophotometry methods indicated that the isolated compound hypothetically was anthocyanidin-3-O-rutinoside