Judul: Characteristics of Sweet Potato Noodles Substitution by Sago Starch or Banggai Starch and Calcium Fortification
Abstrak: Ubi jalar adalah pangan lokal yang mendukung program diversifikasi pangan melalui pengaplikasian sebagai bahan baku pembuatan produk yang banyak disukai oleh masyarakat, salah satunya adalah mi. Penambahan pati sagu dan pati ubi banggai pada adonan mi ubi jalar diharapkan dapat meningkatkan kualitas mi yang dihasilkan, karena kedua pati ini memiliki karakteristik lebih mudah mengalami retrogradasi. Pengolahan menggunakan ekstruder dapat meningkatkan kualitas mi yang dihasilkan melalui pemberian panas dan shear stress. Peningkatan kualitas mi ubi jalar dari segi kandungan nutrisi dapat dilakukan dengan fortififikasi kalsium agar produk mi ubi jalar menjadi pangan sumber kalsium yang dapat mencegah terjadinya osteoporosis. Untuk memperoleh cara pengolahan mi terbaik, pada penelitian ini dilakukan tiga perlakuan, yaitu perbedaan jenis pati (pati sagu dan pati ubi banggai), suhu ekstrusi (90 dan 95ºC), dan penambahan air (35 dan 40%). Cara pengolahan terbaik dipilih berdasarkan hasil pengukuran warna, tekstur (kekerasan, kekenyalan, kelengketan, elongasi), dan cooking loss. Pada formula mi ubi jalar terpilih, dilakukan fortifikasi kalsium dengan dua garam kalsium yang berbeda, yaitu kalsium karbonat dan kalsium sitrat, masing-masing pada konsentrasi 20 dan 30% AKG dan dilanjutkan dengan pengukuran warna, tekstur, cooking loss, dan uji hedonik. Hasil pengujian pada mi ubi jalar menunjukkan bahwa perlakuan perbedaan jenis pati, penambahan air, dan suhu ekstrusi memengaruhi karakteristik fisik mi. Penambahan pati sagu 15%, air 40%, dan pengaturan suhu 95°C dapat menghasilkan mi ubi jalar dengan karakteristik warna agak gelap serta terdapat unsur warna merah dan kuning, memiliki nilai kekerasan diatas 3000 gf, dengan kekenyalan dan elongasi lebih tinggi dibandingkan formula yang lain, serta nilai kelengketan dan cooking loss yang lebih rendah. Fortifikasi kalsium karbonat ataupun kalsium sitrat, konsentrasi 20 dan 30 % AKG pada formula ini menunjukkan adanya perbedaan secara signifikan, yaitu dapat meningkatkan intensitas kecerahan, warna merah, dan kuning pada mi. Fortifikasi kalsium pada mi ubi jalar tidak mempengaruhi tingkat kekerasan, kekenyalan, kelengketan, elongasi, dan cooking loss. Penilaian panelis terhadap tingkat kesukaan menunjukkan bahwa secara keseluruhan mi ubi jalar fortifikasi kalsium dapat diterima oleh panelis., Sweet potato is a local food that supports food diversification programs through its application as a raw material for making products that are liked by common people, one of which is noodles. The addition of sago starch and banggai starch to the sweet potato noodle dough is used to improve the quality of noodles, because these two starches are more prone to retrograde. Processing using an extruder by applying heat and shear stress can improve the quality of the noodles produced. Improving the quality of sweet potato noodles in terms of the components contained can be done by calcium fortification so that sweet potato noodle products become food sources of calcium that can prevent osteoporosis. In order to obtained the best noodle processing method, three treatments were carried out in this study, there were different types of starch (sago starch and banggai starch), extrusion temperature (90 and 95ºC), and the addition of water (35 and 40%). The best processing method was selected based on the measurement of color, texture (hardness, elasticity, stickiness, and elongation), and cooking loss. In the selected sweet potato noodle formula, calcium fortification was carried
Keyword: calcium, fortification, noodles, starch, sweet potato

Judul: Pengaruh Fermentasi Natural dan Fermentasi Lactobacillus casei Terhadap Karakter Fisikokimia Tepung Ubi Jalar (Ipomea batatas) Varietas Jago
Abstrak: Sweet potato (Ipomea batatas) has considerable potencies to be developed to support food diversification in Indonesia. One of sweet potato variety is Jago. Jago variety has high yields with high starch content, and suitable to be used in flour and starch production. Fermentation can be done to increase physicochemical and functional quality of sweet potato flour. In this research, sweet potato Jago was fermented for 1, 2 and 3 days using natural fermentation and controlled fermentation with Lactobacillus casei. Then the physicochemical properties were analyzed. Analysis showed that the sweet potato flour with best functional quality was the flour which fermented using L. casei during 3 days (L3). This flour contained 11.42% moisture, 0.41% ash, 0.20% fat, 1.72% protein, and 86.24% carbohydrate. The water absorption index of this flour was 2.78 gr/gr, the water solubility index was 0.0009 gr/ml, swelling power was 10.36%, solubility was 0.21%, whiteness index was 88.30% and freeze-thaw stability was 59.64%. The RVA analysis showed that peak viscosity of L3 flour was 6395 cP, breakdown viscosity was 3931 cP, final viscosity was 4030 cP, setback viscosity was 1566 cP, pasting temperature was 75.75⁰C and the peak time was 6.93 minute.
Keyword: Lactobacillus casei, fermentation, Jago variety, sweet potato flour

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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