Tofu is a high-protein soy-based food ingredient that is widely consumed in Indonesia. Tofu producers in Delta Pawan Subdistrict are dominated by small and medium-sized entrepreneurs whose hygiene and sanitation aspects in production activities are very under-taken. This study aims to determine the presence of Coliform and Salmonella Sp bacteria on tofu produced in Delta Pawan sub-district, Ketapang, West Kalimantan and compare with SNI01-3142-1998. The method used to detect the presence of Coliform bacteria in this study uses the Most Probable Number (MPN) method, which consists of estimator and confirmatory tests using Lactosa Broth (LB) media for the Brilliant Green Lactose Broth (BGLB) assay test for confirmation . Whereas to detect the amount of Salmonella Sp using the method of Total Plate Count (TPC) with selective media Salmonella Shigella Agar (SSA). The results of Coliform analysis in both industries found Coliform MPN values of more than 2400 AMP / g samples, which indicated that they did not meet the standards set by SNI. While the results of the analysis of Salmonella Sp obtained positive results, so the two industries did not meet food safety standards.
Limbah kulit dan kepala udang mengandung senyawa kitin yang bermanfaat dalam bidang pangan. Sintesis kitin menjadi chitosan dapat bermanfaat sebagai edible coating pada buah tomat. Tujuan dari penelitian ini untuk mengetahui kadar air, abu dan protein pada chitosan cangkang udang galah dan mengetahui pengaruh penambahan chitosan terhadap lama penyimpanan buah tomat. Analisis data dalam penelitian menggunakan Rancang Acak Kelompok (RAK) dua faktor yaitu lama penyimpanan tomat dengan 5 taraf, yaitu 0; 3; 6; 9; dan 12 hari, dan konsentrasi serbuk chitosan dengan 4 taraf, yaitu 0%; 1%; 1.5% dan 2%. Hasil analisis chitosan yaitu kadar air 7.90%; abu 3.72% dan protein 4.01%. Penambahan konsentrasi chitosan memberikan pengaruh terhadap jumlah dissolved solids, susut berat, total acidity dan vitamin C selama penyimpanan buah tomat.
Tanaman raru adalah jenis tanaman hutan yang memiliki tinggi 70-85 cm, memiliki kulit yang tebal kemudian diolah menjadi serbuk oleh masyarakat wilayah Kalimantan biasa dinamakan kulit kayu resak yang biasanya dimanfaatkan sebagai bahan pengawet nira nipah . berdasarkan dari penelitian, kayu raru memiliki kandungan senyawa terpenoid, arilpropanoid, benzofuran, flavonoid, hidrokuinon dan oligostilbenoid (Fuad, 2010). Penelitian ini bertujuan untuk mengetahui zona hambat dari beberapa konsentrasi ekstrak kulit kayu raru dan mengetahui senyawa apa saja yang terkandung pada ekstrak kulit kayu raru. Metode penelitian yang digunakan adalah eksoperimental deskriptif yaitu menggunakan ekstraksi soxhlet yaitu pelarut etanol dan methanol (p.a). Masing-masing ekstraksi tersebut dilakukan 3 kali ulangan sehingga diperoleh 18 satuan percobaan. Data hasil pengamatan dianalisa dengan dua macam analisa yaitu analisa deskriptif menggunakan mikrosoft Excel. Data hasil pengamatan ditampilkan dalam bentuk tabel, dan untuk mudah interpretasi data maka dibuat grafik atau histogram. Analisa ini digunakan analisa rendemen, untuk uji aktivitas antibakteri, dan identifikasi senyawa aktif kulit kayu raru metode GC-MS. Data hasil penelitian menunjukkan rendemen tertinggi pada ekstrak kulit kayu raru yang menggunakan pelarut etanol dan hasil uji zona hambat diperoleh pada ekstrak kulit raru yang menggunakan pelarut etanol dengan bakteri uji S.aureus. Hasil penelitian diperoleh rendemen paling tinggi diperoleh pada penggunan pelarut metanol yaitu 35,65%. Perlakuan terbaik diperoleh pada aktivitas antibakteri dengan pelarut metanol 99%. Bakteri gram positif yaitu S.aureus lebih sensitif terhadap aktivitas antibakteri.KATA KUNCI: aktivitas antibakteri, GC-MS, kulit kayu raru. ANTIBACTERIA ACTIVITY EXPERIMENT ON PATHOGEN BACTERIA AND ACTIVE COMPOUND IDENTIFICATION ON RARU WOOD BARK (Vatica leucocapra) ABSTRACTRaru is a forest tree which has height about 70-85 cm, has thick bark, which is usually processed to become powder in Kalimantan, called resak wood bark. It’s usually used as a preservative on nira nipah. Based on Fuad (2010), raru wood bark has compound such as terpenoid, arilpropanoide, benzofurane, flovonoide, hidroquinon and oligostilbenoide. The aims of this experiment are to identified clear zone from several consentration (90%, 95% and 99%) and active compound on raru wood bark extract. The treatments are soxhlet extraction with ethanol and methanol solvent (p.a.). Each extraction is done three times so there will be 18 experimental units. Rendement was analyzed by the antibacteria activity and the active compound identification with GC-MS. Result of this experiment is analyzed descriptively with microsoft excel programe and the data is showed in tabels and graphs or histograms. The result of the experiment are the highest rendement taken from methanol extraction treatment, is 35,65%. The best treatment is taken from antibacterial activity examination of methanol solvent treatment (99% consentration). Raru wood bark extract more effectively to inhibit gram positive bacteria (S. Aureus) than gram negative bacteria (E. Coli). Chromatogram GC-MS identified hexadecanoic acid as an active compound in raru wood bark, which belongs to carboxylic acid group.
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