Judul: Kandungan 2-Asetil-1-Pirolina dan Heksanal pada Beberapa Varietas Beras (Oryza Sativa L.) Aromatik Selama Penyimpanan dengan Beragam Derajat Sosoh dan Jenis Pengemas
Abstrak: Scented rice or aromatic rice varieties is popular because of their flavor and texture. 2-Acetyl-1-pyrroline (2AP) contribute to pandan-leaves-like aroma, and hexanal is used as indicator of rancidity. Three aromatic cultivars (Mentik Wangi, Pandan Wangi, and Sintanur) with 100, 90, and 0% (brown rice) milling degree were stored in two types of packaging, i.e., plastic bag and hermetic bag for 4 months in room temperature. 2-Acetyl- 1-pyrroline and hexanal were determinded every 2 month during storage using gas chromatography mass spectrophotometer. Prescribed nutrient content with proximate analysis including moisture, ash, fat, protein, and amylose content, were done at the begining and at the end of storage time. Preference of rices was done by hedonic test. 2- Acetyl-1-pyrroline concentration decreasing during storage and as increasing with the milling degree. Brown rice have a highest hexanal than 90% and 100% of milling degree. Hexanal increased during 2 month storage, and decreased in 4 month storage. During storage, moisture, ash content, protein, and fat were still in standard range according to several references. Based on the amylose content, the texture all of rice before storage was sticky category and after four months of storage fell into smooth until hard texture. however ash and fat content were increasing. From preference test, Mentik Wangi 100% milling degree before storage is the most prefered rice than others. Both of hermetic bag and plastic bag gives no different influence in this case.
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Judul: Identifikasi Character Impact Compounds Flavor Beras Aromatik (Oryza myristica L.) Asli Indonesia
Abstrak: Consumers prefer aromatic rice because of its pleasant aroma when it is eaten. Study on the aroma components of Indonesian aromatic rice is still limited. The objective of this study was to evaluate the composition of aroma components in aromatic rice (varieties of Pandan Wangi Garut, Pandan Wangi Cianjur, and Rojolele) and non-aromatic rice (IR-64) and to identify the character impact compounds of aromatic rice in the variety Pandan Wangi Garut by Aroma Extract Dilution Analysis (AEDA) method. The aroma components of non aromatic rice (IR-64) were also analyzed to compare the composition results. The aroma component of aromatic and non aromatic rice were extracted using Simultaneously Distillation Extraction (SDE) Likens Nickerson method and were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS) and Gas Chromatography-Olfactometry (GC-O). The number of aroma components identified in aromatic rice was vary between 17 to 48 compounds, whereas non aromatic rices had 17 compounds. Their chemical classes are aldehides, alcohols, heterocyclic compounds, esters, hydrocarbons, ketones and carboxylic acids. The difference between aromatic and non aromatic rice was the occurence of 2-acetyl-1-pyrroline and the concentration of hexanal, 1-pentanol, acetophenone, 1-octen-3-ol, (E,E)-2,4-decadienal and 2-penthylfuran. Their similarity was the concentration of ethyl acetate. The character impact compounds of aromatic rice Pandan Wangi Garut were 2-acetyl-1-pyrroline, which has sweet, pleasant, pandan aroma, and ethyl acetate which has a caramel and fruity aroma.
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Judul: Rancang Bangun Pembangkit Listrik Tenaga Gelombang Laut dengan Menggunakan Piston Robot
Abstrak: Pembangkit listrik tenaga gelombang laut merupakan salah satu solusi dari pemanfaatan energi terbarukan yang memanfaatkan gerakan gelombang laut menjadi energi listrik. Tujuan penelitian ini adalah membuat prototipe pembangkit listrik gelombang laut dengan menggunakan piston robot sebagai penghasil listrik. Pembuatan alat ini dilakukan melalui beberapa tahap yaitu tahap perancangan mekanik, perancangan elektronik, perancangan perangkat lunak serta melalui uji laboratorium dan uji lapangan. Instrumen ini dipasang di bagian samping bagan apung, piston akan bekerja dengan baik ketika gelombang laut menggerakkan piston secara vertical, pergerakan undulasi ini yang memutarkan propeller fan. Berdasarkan uji laboratorium terdapat hubungan positif antara jarak pergerakan piston dengan tegangan yang dihasilkan. Uji coba laboratorium pergerakan piston jarak 15 cm menghasilkan 1.08 volt, jarak 30 cm menghasilkan 2.12 volt dan pada jarak 45 cm menghasilkan tegangan 3.15 volt. Uji lapang yang dilakukan di Palabuhanratu menghasilkan tegangan maksimal sebesar 3.3 volt.
Keyword: Energi gelombang laut, pembangkit listrik tenaga gelombang laut, fan sebagai pembangkit listrik