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Eksakta: Jurnal Ilmu-Ilmu MIPA
95 Publications
collected from a compatible aggregator


  • Pengaruh Penambahan 1,4-Butanadiol dan Polietilen Glikol (PEG) 1000 terhadap Kemudahan Biodegradasi Bioplastik dari Biji Nangka (Artocarpus heterophyllus)

    Argo Khoirul Anas; Nanang Rudianto Ariefta; Yuni Nurfiana; Eli Rohaeti (2016)
    The influences of plasticizer on the biodegradability of bioplastic film synthesized from starch obtained from jackfruit seeds with a help of Acetobacter xylinum were investigated. In this study, 1,4-butanediol and polyethylene glycol (PEG) 1000 were used as plasticizer. The biodegradation behavior of the resulted bioplastic films was characterized by calculating changes in their mass loss and rate of mass loss. The Fourier Transform Infrared (FTIR) spectroscopy was also conducted to analyze ...

    Analisis Perubahan Kawasan Mangrove Berdasarkan Interpretasi Data Spasial Di Tn. Sembilang, Pantai Timur Sumatera, Banyuasin, Sumsel

    Yetty Hastiana; Fachrurrozie Sjarkowi; Dwi Anugrah; Rasjid Ridho (2012)
    Due to the importance of mangrove ecosystem role to coastal area stability, study and research on mangrove ecosystem is interesting. Several study forms can be performed including by sightseeing and predicting degradation and change of mangrove conservation area during certain time. Result of prediction and analysis can be used by decision maker to state the priority of area protection. As intial step in management analysis for mangrove area ecosystem in Pasut area , TN. Sembilang Pantai Timu...

    Synthesis andCharacterization of 2,3,4-Trihydroxy-5-methyl Xanthone as Antimalarial Compound

    Fitriastuti, Dhina; Jumina, Jumina; Priatmoko, Priatmoko (2016)
    Synthesis of xanthone derivatives had been conducted to obtain new antimalaria active compounds. The characterization of the synthesized xanthones was also conducted.Synthesis of xanthone was conducted from the raw material of hydroxybenzoic acid and phenol derivatives using Eaton’s reagent via acylation-dehydration reaction by modified Grover, Shah and Shah (GSS) method. The synthesis of 2,3,4-trihydroxy-5-methyl xanthone was carried out using gallic acid, o-cresol and Eaton’s reagent.The mi...

    Redox Reaction in the Cyclization-aromatization of (R)-(+)-Citronellal with FeCl3/Acetic Anhydride

    Cahyono, Edy; Muchalal, Muchalal; Pranonowo, Harno Dwi (2012)
     The effects of temperature, time of reaction, and the reactants mole ratio on the cyclization-acetylation of (R)-(+)-citronellal with FeCl3/acetic anhydride were studied.  Isopulegyl acetate (IPA) and neoisopulegyl acetate (NIPA) were obtained as the main products at room temperature (mole ratio of citronellal: acetic anhydride: FeCl3 = 6:12:1). Both products are relatively fixed after the 30th minute. The average concentration of IPA at 30-180 minutes was 44.71%, while the average concentr...

    Decreasing in Acid Number of Patchouli Oil by Different Natural Adsorbent and Variation of Contact Time

    Purbaningtias, Tri Esti; Wiyantoko, Bayu; Kurniawati, Puji; Sari, Mustika Kusuma (2014)
    One way for improving (of improving atau to improve) the quality of patchouli oil was to reduce the acid number. Acid number could be reduced with the use of natural adsorbents. The decreasing percentage acid number of patchouli oils using adsorbents zeolites, bentonite, rub ash, and activated carbon, respectively 4.71 %; 1.45%; 7,84%; and 4.64%. The contact time could influence the decrease in acid number of patchouli oil. The longer the contact between adsorbent and oil could caused a decre...
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