Judul: Pembuatan Biofilm Berbahan Dasar Polisakarida dari Karaginan dan Tepung Tapioka
Abstrak: Carrageenan is a hydrocolloid extracted from Eucheuma cottonii seaweed which is a polysaccharide. Carrageenan with tapioca flour and glycerol can produce biofilm. Biofilm is an environmentally friendly material potencial as a food packaging material. The aims of this research ware to produce a biofilm from carrageenan and tapioca flour and to assess the tensile strength and elongation values as well as the water vapor permeability property. The concentration of flour added were 1, 2.5, 5, and 10% (w/v). Film with 10% concentration of flour had the highest tensile strength and elongation values compared with the other films, which were 1024 MPa and 38.4%. The lowest water vapor permeability was showed by film with 1% concentration of flour that was (ng m/ s m2 Pa). The presence of carrageenan in this film was showed by the infrared absorption in 925.83 cm-1 wavenumber which is characteristic of 3,6-anhydro-D-galactose functional group in carrageenan
Keyword: carrageenan, cassava flour, water vapor permeability

Judul: Edible Film dari Perpaduan Karaginan, Selulosa Bakteri, dan Nanokarbon dengan Penaut Silang Asam Sitrat
Abstrak: Edible film is a film made of food grade materials. The film has mechanical properties and can act as a barrier so that it can prolong the shelf life of food products. Carrageenan is a base material of film derived from seaweed (Eucheuma cottonii). Addition of glycerol, bacterial cellulose, nanocarbons, and citric acid were used as compatibilizers to improve the mechanical properties of the carrageenan film. The optimum composition of edible film composed of glycerol, bacterial cellulose, nanocarbon 1.5%, and citric acid 10% increased tensile strength up to 160% and decrease of water vapor permeability up to 42% as compared to the carrageenan film. Tensile strength and water vapor permeability values met the standard for edible film as food packaging. The result of infrared spectrum showed the formation of the new functional groups on 1717 cm-1 that caused by the addition of citric acid crosslinker. Luminescence of nanocarbon can be detected using ultraviolet light at wavelength of 366 nm with the presence of blue color
Keyword: Bogor Agricultural University (IPB), water vapor permeability, nanocarbon, mechanical properties, citric acid crosslinker, carrageenan

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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