Judul: Komponen minyak atsiri daun sirih (Piper betle L.) dan potensinya dalam mencegah ketengikan minyak kelapa
Abstrak: Coconut oil contains glyceride, are compounds of glycerine with fatty acids. The amount of unsaturated fatty acid content in the oil greatly affects the stability of their chemical structure. Coconut oil contains karotenoida only slightly, making it easier to happen oxidation that can produce compounds called free radicals. This compound can donate the rancid. This study aims to test the chemical potential of essential oil of betel leaf in preventing rancid on coconut oil. Essential oil of betel leaf is obtained by distillation, then added coconut oil to obtain essential oil content of 2%, 3% and 5%, then performed the test peroxide numbers. Analysis of chemical content of essential oil of betel leaf done with Chomatography Gas -Mass Spectroscopy. Essential oil of betel leaf contains phenolic compounds, chavicol and acetyl eugenol which can function as an antioxidant. The isolated essential oil of betel leaf gained 3.8% yield of essential oil. After 30 days the value of peroxide number in coconut oil with high levels of 2%, 3% and 5% essential oils in a row shows 3.33 Meq/kg of materials, 3.39 Meq/kg of materials and 2.38 Meq/kg of material. Analysis of chemical constituents of essential oil of betel leaf with GC-MS showed that essential oil of betel leaf has antioxidant potential because there are compounds of phenol-2- methoxy-3-(2-propenyl), and Chavicol which serves as a reductant for oxidized compounds.
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Judul: Karakterisasi dan Analisis Fisiko-Kimia Terhadap Minyak Kelapa dengan Penambahan Ragi roti, Enzim Papain Kasar, Enzim Bromelin Kasar dan Starter Ragi Tape.
Abstrak: Coconut plants (Cocos nucifera L) are grouped into two main varieties of Coconut (tall variety) and Coconut Elephant (dwarf variety). Coconut meat used as raw material in the manufacturing of coconut oil. Coconut oil is generally divided into three types ie: RBD (Refined, Bleached, and Deodorized), VCO (Virgin Coconut Oil) and Traditional Coconut Oil. Coconut oil contains lauric acid which are categorized as an acid medium chain saturated fatty acid. Lauric acid in coconut oil contained approximately 53%, which is efficacious as a natural antibiotic that can kill many types of germs, viruses and parasites such as HIV and hepatitis C virus. Coconut milk is an oil and water emulsions stabilized by proteins and possibly by some ions are adsorbed on the surface of the boundary between oil and water, in this study coconut milk obtained was treated with additions such as yeast breads, crude enzyme papain, crude enzyme bromelain, tape yeast starter. Use of yeast, starter and crude enzyme is intended to break the emulsion which were with components degrade proteins such as emulsion stabilizer. The Randomized Complete Design Group was used for analysis the obtained onto, followed by analysis of variance and Duncan Multiple Range Test showed that crude enzyme bromelain treatment was meet effective for breaking the emulsion, having a yield of oil and water, 31.51 and 0.251 percent, respectively. A good extraction was obtained by using water at 700C that had peroxide number of 1.16 O2/100 g oil.
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Judul: Sistem Informasi Geografis untuk Pola Aktivitas Manusia dengan Pemodelan Data Spatio-Temporal
Abstrak: The human activity in a given time period will shape its pattern. This research develops a spatiotemporal data model to support the prediction of human existence based on activity-pattern and also visualizes the activity locations in a GIS environment. This so-called mobility oriented spatiotemporal data model conceptualizes the spatial and temporal interaction of activity behaviour using the concept of mobility. In other words, activity patterns are conceptualized as a sequence of staying at or traveling between activity locations. The model can support the analysis and queries of activities from different perspectives, i.e. queries can be time-oriented, person-oriented, activity-oriented, and location-oriented. A prototype system based on the activity data modelling is implemented in MySQL 5.0.27 as DBMS with using PhpMyAdmin 2.9.1.1 software. Spatial database is developed with using software QuantumGIS and ArcView. The system could be accessed online through a web browser with MySQL as its database storage and Pmapper framework as the tools used in visualizing the activity locations.The information were provided in the form of activity attribute-data as the user requested and graphical-data (map) which contains information about its activity locations.
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