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: Pemanenan Energi Listrik dari Kincir Angin Vertikal
Abstrak: Usaha pemanenan energi angin di Indonesia masih sedikit. Sampai Tahun 2016 hanya 3.54 MW alat pemanenan energi angin yang sudah terpasang. Kendala utamanya ialah dibutuhkan investasi yang besar untuk membuatnya. Pembuatan kincir angin dengan ukuran yang lebih kecil dengan bahan yang dapat dibeli di pasar lokal menjadi solusi agar pembuatan kincir angin lebih ekonomis. Pembuatan kincir vertikal tipe Savonius dapat menjadi solusinya. Kincir vertikal Savonius dapat beroperasi pada kecepatan < 3 m/s dan ketinggian < 50 m. Kincir angin ini terdiri dari tiga sistem, yaitu generator, rotor kincir dan transmisi pulley-belt. Generator dibuat dari modifikasi motor AC dan magnet neodymium. Rotor kincir dibuat dari pipa PVC 4”, pipa alumunium ¾”, dan papan polikarbonat. Transmisi pulley-belt dibuat dari plastik dan karet. Kincir ini membutuhkan gaya minimal 3 N untuk dapat berputar atau torsi minimalnya 0.75 Nm. Kecepatan angin yang dibutuhkan untuk merotasikannya sebesar 1.9 m/s. Daya maksimal yang dapat dihasilkan ialah 5.76 watt berupa tegangan sebesar 36 volt dan arus 160 mA.
Keyword: energi terbarukan, generator, motor AC, sudu Savonius