Judul: Ekstraksi dan Karakterisasi Gelatin dari Tulang Ikan Cobia (Rachycentron canadum)
Abstrak: Pemanfaatan tulang ikan cobia (Rachycentron canadum) belum dilakukan secara optimal. Konversi tulang menjadi gelatin dapat meningkatkan nilai tambah produk. Isolasi gelatin dari tulang ikan cobia dilakukan melalui empat tahap, yaitu degreasing, deproteinisasi dengan NaOH 0,05M dengan rasio sampel/larutan, yaitu 1:10 (b/v) selama 5 hari, demineralisasi menggunakan HCl 5% dengan rasio sampel/larutan adalah 1:6 (b/v) selama 4 hari, dan ekstraksi menggunakan akuades selama 3 jam pada suhu 70oC dengan rasio sampel/larutan 1:2 (b/v). Rendemen yang diperoleh berdasarkan perhitungan basis basah adalah 5,76%. Gelatin yang dihasilkan memiliki kandungan protein yang tinggi yaitu 86,65%, kadar air (10,35%), abu (0,75%), dan lemak(1,25%) yang rendah. Nilai pH yang diperoleh yaitu 6,56. Analisis asam amino menunjukkan bahwa gelatin memiliki komposisi glisin dan prolina yang tinggi. Analisis FTIR menunjukkan wilayah penyerapan amida A, B, I, II, III pada 3335, 2923, 1657, 1543, dan 1235 cm-1.
Keyword: cobia (Rachycentron canadum), degreasing, deproteinisasi, demineralisasi, ekstraksi, gelatin

Judul: Ekstraksi dan Karakterisasi Kolagen dari Kulit Ikan Cobia (Rachycentron canadum)
Abstrak: Cobia fish (Ranchycentron canadum) was used for a culinary purpose, but their skin was waste part. Convert in a value added product like collagen was a good practice of post harvest management. Isolation of collagen from the skin of cobia fish (Rachycentron canadum) has been successfully conducted with three stages: first soaked in 0,05 M NaOH with a sample/solution ratio of 1:10 (w/v) for 6 hour, second soaked in 0,1 M acetic acid with a sample/solution ratio of 1:6 (w/v) for 2 hour, and third extraction with destilated water at temperature 40 ºC for 3 hour. The yield of collagen was 10,508%. The pH of collagen was 7,08; protein content 86,46%; moisture 11,08%; fat 0,26%; and ash contents 0,19%. Amino acid analysis of collagen revealed the high proline and glycine. FTIR spectra analysis revealed that collagen molecules had the compact triple helical structure stabilized mainly by the hydrogen bond. Fourier transform infrared (FTIR) spectroscopic study showed major absorption bands of amide A, B, I, II and III at 3310, 2932, 1651, 1543 and 1242 cm-1 respectively.
Keyword: FTIR, water ekstraction, cobia (Rachycentron canadum), collagen

Judul: Pendugaan Curah Hujan Dengan Bayesian Network Studi Kasus: Curah Hujan di Daerah Indramayu
Abstrak: The objective of this study was to built the probabilistic modeling and to compare the Bayesian Networks (BNs) method which considers the spatial dependencies among variables for predict rainfall to Auto Regressive Integrated Moving Average (ARIMA) method which assumes the spatial independencies among variables. This research use rainfall data of 14 stations in period 1979 to 2001 in Indramayu, West Java. A network is generated by K2 algorithm, and this networks is used to built probabilistic model using multinomial BNs. The rainfall prediction is based on the combination of Gaussian BNs and ARIMA (BNARIMA). The result shows that BNARIMA is more effective to represent the spatial dependencies among the stations and to predict rainfall than ARIMA.
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