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: Aplikasi Ekstrak Daun Sirih dalam Menghambat Oksidasi Lemak Jambal Patin
Abstrak: Jambal Patin is a fisheries product made from striped catfish (Pangasius hypophthalmus) through salting and drying process. Jambal patin contain high fat especially the unsaturated fatty acid so that easy to oxidated that generate rancidity. In others hand, salting and drying process could enhance the lipid oxidation in this product. In this research, betel leaf extract was applied to inhibit the lipid oxidation in jambal patin. Two treatments were applied. First, the combination of 22,5% betel leaf extract and salt solution with ratio of 1:2, 1:3, 1:4, 1:5 and the salt solution without betel leaf extract as control. Second, the storage time for two months. The lipid oxidation inhibition were monitored by determining the TBARS value, anisidine value and fluorescent products every two weeks for two months. Sensory analysis was conducted to determine the sensory changes of jambal patin caused by betel leaf treatments. Two Factorial Completely Randomize Design and Duncan Test were used as statistical analysis. The result showed that betel leaf extract has antioxidant activity better than BHT (IC50 of betel leaf extract was 134 μg/ml, lower than BHT that was 197 μg/ml). The betel leaf extract with ratio of 1:2, 1:3, 1:4, 1:5 could inhibit the lipid oxidation of jambal patin for 2 months with parameter of TBARS value, anisidine value and fluorescent products. Striped catfish contain 56.83% of unsaturated fatty acid and 43.17% of saturated fatty acid. The highest unsaturated fatty acid is linoleic acid 108.04 mg/g fish oil ( jambal patin with betel leaf extract treatment 1:2), 90.09 mg/g fish oil in control and 113 mg/g fish oil in fresh striped catfish meat. The control treatment was more rancid than the treatment with betel leaf extract. The colour and taste of betel leaf could influence the colour and taste of jambal patin. However, jambal patin with betel leaf extract 1:5 could inhibit the lipid oxidation and has sensory value better than other betel leaf extract treatments
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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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