Judul: Karakterisasi Morfologi dan Fitokimia Buah Lobi-lobi (Flacourtia inermis) pada Berbagai Tingkat Kematangan
Abstrak: Lobi-lobi fruits (Flacourtia inermis) is Indonesian local fruits which are now rarely cultivated by the community. But lobi-lobi fruits contain beneficial nutrients such as phenolic and high anthocyanin, thus providing health benefits for the human body, one of them being an antioxidant. This study aims to determine morphological and phytochemical characteristic of lobi-lobi fruits at various stages of maturity based on changes in skin color. This study uses a sample of lobi-lobi fruits at 6 different stage of maturity based on fruit skin color. The observations made were morphological characterization was in the form of fruit diameter, total fruit weight, seed weight, aril weight, edible portion, and fruit hardness, also phytochemical characterization in the form of total dissolved solids (TDS), total titrated acid (TTA), sugar content (glucose, fructose, and sucrose) by enzymatic methods and secondary metabolites by GC-MS method. The results showed that lobi-lobi fruits have a high TTA content at each stage of maturity so that lobi-lobi fruits are a fruit that has a sour taste. The glucose content of lobi-lobi fruits has the highest proportion compared to fructose and sucrose. GC-MS testing showed that there were 34 total compounds at 6 stage of maturity of lobi-lobi fruits. Specific content was identified at maturity stage 1, 4, 5, and 6. Dominant organic acid in lobi-lobi fruits was identified from the GC-MS test conducted is malic acid.
Keyword: chromatography, Flacourtia inermis, lobi-lobi, morphological, phytochemical

Judul: Karakter Kulit Manggis, Kadar Polifenol Dan Potensi Antioksidan Kulit Manggis (Garcinia mangostana L.) Pada Berbagai Umur Buah Dan Setelah Buah Dipanen
Abstrak: The objective of this study were to know the character of mangosteen rind during development of the mangosteen fruit, studying the total phenol content and antioxidant potential of mangosteen rind. Research was done at Plant Analysis and Chromatoghrapy Laboratory, Deparment of Agronomy and Horticulture, Bogor Agricultural University. This research used Completely Randomized Desain Group (RKLT) single factor wich is harvesting, with continue test Duncan Multiple Range Test (DMRT) at level 5%. Harvesting one month after anthesis (BSA), 2 BSA, 3 BSA, 4 BSA and the rind storage two and four weeks after harvesting were done separately. Mangosteen fruit was harvested from Leuwiliang, Bogor. The result showed that total phenolic at crude extract mangosteen and antioxidant capacity to reach IC50 of harvesting and storage have negative correlation. Harvesting handling have effect to fruit weight, aril weight, wet weight rind and vitamin C content. Total phenolic of Harvesting and storage handling have a negative correlation with antioxidant capacity to reach IC50 which are value about -0.53 and -0.91. Assumed that total phenolic content will increase antioxidant capacity in mangosteen rind. Antioxidants capacity on harvesting and sorage handling of mangosteen have IC50<50 (capability of antioxidant are very strong).
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Judul: Pemodelan Harga Saham Menggunakan Generalisasi Proses Wiener dan Model ARIMA
Abstrak: The capital stock of a business entity represents the original capital paid or invested in the business by its founders. Since it is known that the stock price fluctuates in time, it is necessary to have a model to forecast the stock price in the future. In this study, stock price is assumed to follow a continous stochastic process. One of stochastic models that can be used to model the stock price is a model of generalized Wiener process. This model describes the time evolution of stock price as a stochastic variable with constant drift and variance rate. On the other hand, since stock prices data are time series data, so ARIMA model can also be used to model this phenomena and to predict the stock price in the future. Both models are estimated using a chosen set of data. The result is then used to forecast the stock price in the future time. It can be concluded that forecasting study using generalized Wiener process shows a slightly better result than the ARIMA model.
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