Judul: Fractionation of Flavonoid Group from Kepel (Stelechocarpus burahol) Leaves as Antibacterial Agent
Abstrak: The objectives of this research was to separate flavonoids of kepel leavesfrom methanol extract as antibacterial agent. The bacteria used was Staphylococcus epidermidis that corresponds to body odor. The methanol extracts was fractionated in methanol:water (7:3), n-hexane and chloroform consecutively. Methanol:water (7:3) extract with the highest flavonoids content, fractionated by silica gel column chromatography (isocratic elution, with butanol:methanol:acetic acid 1:8:1 as eluent) to produce 7 fractions. All fractions were tested for antibacterial activity with a microplate method. Fraction V was the most active fraction with minimum inhibitory concentration (MIC) 0.06 mg/mL and minimum bactericidal concentration (MBC) of 0.50 mg/mL. Fraction V was further separated by preparative thin layer chromatography and gave three fractions. Fraction V3 was the most active fraction with MIC 1.00 mg/mL and MBC of 2.00 mg/mL. Identification of fraction V3 based on assessments on ultraviolet-visible and infrared spectrum belongs to flavones group.
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Judul: Fraksionasi golongan flavonoid dari daun kepel (Stelechocarpus burahol) yang berpotensi sebagai antibakteri
Abstrak: The objectives of this research was to separate flavonoids of kepel leavesfrom methanol extract as antibacterial agent. The bacteria used was Staphylococcus epidermidis that corresponds to body odor. The methanol extracts was fractionated in methanol:water (7:3), n-hexane and chloroform consecutively. Methanol:water (7:3) extract with the highest flavonoids content, fractionated by silica gel column chromatography (isocratic elution, with butanol:methanol:acetic acid 1:8:1 as eluent) to produce 7 fractions. All fractions were tested for antibacterial activity with a microplate method. Fraction V was the most active fraction with minimum inhibitory concentration (MIC) 0.06 mg/mL and minimum bactericidal concentration (MBC) of 0.50 mg/mL. Fraction V was further separated by preparative thin layer chromatography and gave three fractions. Fraction V3 was the most active fraction with MIC 1.00 mg/mL and MBC of 2.00 mg/mL. Identification of fraction V3 based on assessments on ultraviolet-visible and infrared spectrum belongs to flavones group.
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Judul: Analisis Dinamik Struktur Gedung Terhadap Beban Gempa (Studi Kasus Tower Altiz – Tangerang Selatan).
Abstrak: Penelitian ini bertujuan untuk melakukan pemodelan gedung, menganalisis besarnya periode getar dan kekakuan yang dimiliki gedung, menentukan mode shape dan partisipasi massa, serta menganalisis besarnya gaya geser dasar gempa. Objek penelitian adalah Tower Altiz. Prosedur penelitian mengacu kepada SNI 1727-2013, SNI 1726-2012, SNI 2847-2013, dan PPURG 1987. Berdasarkan hasil penelitian, pemodelan Tower Altiz telah berhasil dilakukan. Periode getar yang dialami Tower Altiz adalah 2.735 detik. Mode shape dari Tower Altiz telah berhasil didapatkan. Untuk besarnya partisipasi massa pada arah x yang lebih dari 90 %, didapat pada mode ke-10, sedangkan untuk partisipasi massa pada arah y didapat pada mode ke-11. Gaya geser dasar statik (Vstatik) sebesar 11359.164 kN sedangkan besarnya gaya geser dasar dinamik (Vdinamik) 8339.260 kN untuk arah gempa-x dan 7722.238 kN untuk arah gempa-y. Faktor skala desain untuk gaya geser dinamik (Vdinamik) sumbu-x adalah 1.15, sedangkan untuk sumbu-y adalah 1.25. Besarnya gaya geser dinamik (Vdinamik) yang diperoleh untuk sumbu-x dan sumbu-y adalah 9655.289 kN.
Keyword: gaya geser, gedung, gempa, struktur