ABSTRAKLimbah kulit bawang merah (Allium cepa L.) yang dihasilkan dari industri rumah tangga sebagian besar belum bisa dimanfaatkan. Hal ini sangat disayangkan karena di dalam kulit bawang merah ini ternyata mengandung banyak sekali senyawa-senyawa kimia yang bisa dimanfaatkan, salah satunya adalah senyawa flavonoid yang dapat berpotensi sebagai antioksidan. Dalam penelitian ini, kulit bawang merah diekstraksi dengan menggunakan pelarut metanol. Kemudian ekstrak dipartisi dengan pelarut etil asetat dan n-heksana lalu diuji fitokimia. Fraksi yang positif mengandung flavonoid yaitu fraksi air dan etil asetat dipisahkan dengan Kromatografi Lapis Tipis menggunakan eluen etil asetat : n-heksana (4:6). Noda dengan Rf yang sesuai dengan flavonoid kemudian dikerok dan diidentifikasi golongannya serta aktivitas antioksidannya dengan menggunakan spektrofotometer UV-Vis. Pengujian aktivitas antioksidan dilakukan dengan menggunakan Metode CR (Serium(IV) Sulfat). Dari spektrum UV-Vis, dapat diduga bahwa senyawa flavonoid tersebut merupakan golongan flavonol yang dapat dilihat pada rentang panjang gelombangnya yaitu antara 240-285 nm (pita II) dan 300-550 nm (pita I). Kemudian dilakukan pengujian aktivitas antioksidan dengan larutan kontrol berupa Vitamin C dan diukur absorbansinya pada panjang gelombang 241 nm, diperoleh hasil % aktivitas antioksidan yang menunjukkan bahwa fraksi etil asetat memiliki potensi sebagai antioksidan lebih besar dibandingkan dengan fraksi air.
Dalam rangka pemanfaatan yang lebih optimal dari beberapa ienis ikan air tawar, telahdilakukan penelitian untuk mengetehui pengaruh jenis ikan dan zat penambahan terhadap kualitas dan kuantitas surimi ikan air tawar.
Sade village woven fabric is one of Lombok’s superior woven fabrics. The process of producing this woven fabric is traditional by using yarn spun from cotton. The purpose of this study is to obtain the optimal strength of cotton yarn using natural dyes. Mordan stage and fixation using alum solution. The coloring stage uses teak leaves, ketapang leaves, and banten skin. All three ingredients are dissolved in water with concentrations 1:10, 1:8, and 1:5. In the mordan stage, 8 grams of alum is dissolved in 1 liter of water. While at the fixation stage, 50 grams of alum is dissolved in 1 liter of water. Teak leaves produce a dark brown color, ketapang leaves produce turmeric yellow color, and banten skin produces a brick red color. After going through the coloring process, the yarn is tested using Tensilon RTG. The result show that the yarn strength increase during the coloring process. In addition, differences in the concentration of the solution also affect the strength of the yarn produced. Solution with a concentration ratio of 1: 8 produces optimal tensile strength of 0.3450 cN/dtex on teak leaves, 0.3369 cN/dtex on ketapang leaves, and 0.2450 cN/dtex on banten skin.
Soybean pustule disease by Xanthomonas axonopodis pv. glycines (Xag) is one of the important diseases of soybean plant. Application Bacillus spp. origin of weed phyllosphere has a great potential as an alternative to control because it is isolated to origin of same region as Xag is the phyllosphere. Research by Nurcahyanti and Ayu obtained the best five isolates of Bacillus spp. of weeds phyllosphere in soybean cropping in inhibiting Xag in vitro. This study used the complete random draft (RAL) 6 treatment, 4 repeats, each unit consists of 4 plants wich treatment application of 5 isolates of Bacillus spp. namely K = control; A = Bacillus JG 1.3; B = Bacillus JG 3.6; C = Bacillus JG 1.4.1; D = Bacillus BGd 1.1; E = Bacillus Bp 2.2. The results showed that application of Bacillus spp. could inhibit Xag in vitro with bacteriostatic mechanism and isolates Bacillus BGd 1.1 has the greatest inhibition of 14.25 mm. Fifth Bacillus spp. can suppress the development of disease and isolates Bacillus BGd 1.1 has best results with the incubation period during 13 HSI, the severity of disease 10.07%, infection rate 0.045 unit/day as well as the effectiveness of control 85.72%. The fifth isolates of Bacillus spp. can not increase the number of leaves but can increase number of branches and isolates Bacillus JG 1.3, Bacillus JG 1.4.1 and Bacillus BGd 1.1 can increase the height of soybean crop.
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