Judul: Kandungan 2-asetil-1-pirolina dan heksanal pada beberapavarietas beras (Oryza sativa L.) aromatik selama penyimpanan dengan beragam derajat sosoh dan jenis pengemas
Abstrak: Beras wangi atau beras aromatik dikenal karena aroma, cita rasa, dan kepulenannya. 2-Asetil-1-pirolina (2AP) berkontribusi pada aroma pandan dan heksanal sebagai indikator tengik pada beras. Beras aromatik varietas Mentik Wangi, Pandan Wangi, dan Sintanur yang disosoh 100, 90, dan 0% (beras pecah kulit) disimpan dalam kantung hermetik dan karung plastik selama 4 bulan di suhu ruang. Selama penyimpanan, kandungan 2AP dan heksanal ditentukan dengan kromatografi gas-spekrometer massa, yaitu pada bulan ke-0, 2, dan 4. Sementara kandungan gizi ditentukan dengan analisis proksimat yang meliputi kadar air, kadar abu, kadar lemak, kadar protein, dan kadar amilosa. Analisis proksimat dilakukan di awal bulan dan akhir bulan penyimpanan. Uji penerimaan pada beras dilakukan dengan uji hedonik. Hasilnya menunjukkan bahwa konsentrasi 2AP menurun saat derajat sosoh semakin meningkat dan selama penyimpanan. Konsentrasi heksanal tinggi saat beras belum disosoh (pecah kulit) dan meningkat selama 2 bulan penyimpanan. Konsentrasi heksanal kemudian menurun kembali saat 4 bulan penyimpanan. Selama penyimpanan kadar air, abu, protein dan lemak masih berada dalam kisaran standar yang diacu dari beberapa referensi. Berdasarkan kandungan amilosanya, sebelum penyimpanan ketiga varietas beras termasuk beras bertekstur pulen dan setelah empat bulan penyimpanan menjadi teksur pulen sampai sedang. Berdasarkan uji penerimaan pada aroma, warna, kepulenan, rasa, dan penerimaan secara umum beras yang paling disukai adalah Mentik Wangi kemudian disusul dengan Sintanur dan Pandan Wangi. Kesukaan ini tinggi pada saat awal penyimpanan dan derajat sosoh 100%. Tidak ada perbedaan pengaruh antara kemasan karung plastik dan kantung hermetik dalam penelitian ini.
Keyword: Oryzae, Brown rice, Polishing

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: Dynamics Model for Rural and Urban Economic Growth
Abstrak: Lewis theory of structural change has focused on mechanisms that allow countries to transform their domestic economic structure to a more modern economy. The proposed model deals with the mechanism of interaction between rural and urban Economic. This model is concerned with the process of labor transfer from rural to urban areas. This study aims to model the dynamics of economic growth in rural and urban areas, including determining the equilibrium solution and to carry out simulation of the model. The simulation results show that the transfer of labor from rural to urban areas will increase the rate of change of capital so that structural changes can be realized. In addition, increased propensity to save in rural areas will also accelerate structural change
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