Electronic Theses and Dissertation

Indonesia memiliki keanekaragaman hayati terbesar di dunia, salah satunya berupa alga. gelidium sp. merupakan salah satu jenis alga merah (rhodophyta) yang terdapat di pantai sundak, gunungkidul. tujuan dari penelitian ini yaitu untuk mengetahui potensi ekstrak gelidium sp. sebagai sumber antioksidan dan antibakteri dari pelarut etanol dan metanol (polar), etil asetat (semi polar), dan n-heksana (nonpolar). penelitian ini menggunakan rancangan acak lengkap (ral) yang terdiri dari 4 perlakuan, yaitu menggunakan pelarut etanol, metanol, etil asetat, n-heksana dengan ulangan sebanyak 3 kali. pengujian terdiri dari uji kadar air, persentase berat rendemen, uji kadar total polifenol metode folin ciocalteu, uji kadar total flavonoid metode kuersetin, uji antioksidan metode dpph, dan uji antibakteri metode difusi cakram. data kadar total polifenol, flavonoid, dan antioksidan yang diperoleh dianalisis menggunakan analisis sidik ragam (anova) pada taraf 95%, apabila perlakuan berpengaruh (p

Indonesia has the largest biodiversity in the world, one of which is algae. Gelidium sp. is a type of red algae (Rhodophyta) found on Sundak Beach, Gunungkidul. The aim of this research is to determine the potential of Gelidium sp extract. as a source of antioxidants and antibacterials from the solvents ethanol and methanol (polar), ethyl acetate (semi-polar), and n hexane (nonpolar). This research used a Completely Randomized Design (CRD) which consisted of 4 treatments, namely: using ethanol, methanol, ethyl acetate, n-hexane solvents with 3 replications. The tests consisted were water content test, yield weight percentage, total polyphenol content test using the Folin Ciocalteu method, total flavonoid content test using the kuersetin method, antioxidant test using the DPPH method, and antibacterial testing using the disc diffusion method. Data on total levels of polyphenols, flavonoids and antioxidants obtained were analyzed using analysis of variance (ANOVA) at the 95% level, if the treatment had an effect (p