14 articles in this issue
Bambang Purwono,Chairil Anwar,Ahmad Hanapi
Preparations of azo, imine and azo-imine derivatives from vanillin as an indicator of acid-base titration have been carried out. The azo derivative of 4-hydroxy-3-methoxy-5-(phenylazo)benzaldehyde 2 was produced by diazotitation reaction of vanillin in 37... see more
Atmanto Heru Wibowo,Lailatul Mubarokah,Adhitasari Suratman
A study of batch fermentation of green algae (Spirogyra majuscula Kuetz) from Pengging Lake, Boyolali, Central Java for bioethanol source using immobilization technique of Ca-alginate for Saccaromyces cerevisiae entrapment has been done. The scope of the ... see more
Agnes Nora Iska Harnita,Ign. Edi Santosa,Sudibyo Martono,Sudarsono Sudarsono,Sitarina Widyarini,Frans J.M. Harren
This study examines the antioxidant activity of crude phlorotannins from the brown algae Sargassum hystrix v. buxifolium (Chauvin) J. Agardh, through the inhibition of a lipid peroxidation reaction that is induced by the UV radiation. The antioxidant acti... see more
Abu Hasan,Rochmadi Rochmadi,Hary Sulistyo,Suharto Honggokusumo
The determination of free sulfur in the rubber vulcanizates provided significant representation of vulcanization reaction. In this research, the effects of vulcanization temperature, the mixing method of carbon black into rubber, the ingredients mixing se... see more
Dian Pribadi Perkasa,Erizal Erizal,Darmawan Darmawan,Akhmad Rasyid
The objective of this research was to investigate the effect of gamma irradiation on mechanical and thermal properties of fish gelatin films prepared from scales of Lates calcarifer. The films were irradiated by gamma rays at varied doses (0-50 kGy). The ... see more
Abdullah Abdullah,Triyono Triyono,Wega Trisunaryanti,Winarto Haryadi
Determination of the optimum reaction time, activation energy (Ea) and frequency factor (A) of methyl ricinoleate nitration has been done. The nitration was conducted with the mole ratio of methyl ricinoleate to HNO3 of 1:15. The reaction was conducted at... see more
Erizal Erizal,Tjahyono Tjahyono,Dian PP,Darmawan Darmawan
The aim of this research is to prepare a biomaterial to be used in health care. A series of hydrogels based on polyvinyl pyrrolidone (PVP)/?-Carrageenan (KC) has been prepared by radiation technique. PVP (5-15%) were mixed with ?C (2%) and irradiated by g... see more
Kamisah D. Pandiangan,Wasinton Simanjuntak
In this study, transesterification of coconut oil with dimethyl carbonate (DMC) for preparing biodiesel has been studied using TiO2/SiO2 as heterogeneous catalyst, with the main purpose to investigate the effect of molar ratio of DMC to oil. The product w... see more
Teuku Beuna Bardant,Sudiyarmanto Sudiyarmanto,Haznan Abimanyu,Aisha Kania Hanum
Enzymatic hydrolysis with high substrate loading of palm oil (Elaeis guineensis) empty fruit bunch (EFB) and water-hyacinth (Eichhornia crassipes) were investigated as a prior part of ethanol production from lignocelluloses. Commercial surfactant Span 85 ... see more
Nanik Wijayati,Harno Dwi Pranowo,Jumina Jumina,Triyono Triyono
The hydration of a-pinene has been studied in the presence of Y-zeolite (Si/Al = 2.89) as a solid acid catalyst. The reaction was performed in batch reactor in isopropyl alcohol at various temperature and reaction time with magnetic stirrer. The acid cata... see more
Zainal Alim Mas’ud,Mohammad Khotib,Nurmutia Sari,Anwar Nur
Cassava waste pulp (CWP) contains high carbohydrates that can be modified into super absorbent polymer (SAP) through grafting and cross-linking copolymerization. Acrylamide (AM) was grafted onto CWP with ammonium persulfate (APS) as the initiator and N,N'... see more
Rycce Sylviana Pratikha,Syukri Syukri,Admi Admi
Catalysts have played an important role in many industries because they allow the reaction occurs faster. The aim of this work were to synthesize and characterize a Cu(II)-acetonitrile complex immobilized on modified silica and to investigate its catalyti... see more
Sri Kadarwati,Fitri Rahmawati,Puji Eka Rahayu,Kasmadi Imam Supardi
Kinetics and mechanisms of Ni/zeolite-catalyzed cracking reaction of methyl ester palm oil (MEPO) were studied using a continuous flow-fixed bed reactor system at an atmospheric pressure. The catalyst was prepared by wet impregnation method with a solutio... see more
Mudasir Mudasir,Yari Mukti Wibowo,Harno Dwi Pranowo
Design of new potent insecticide compounds of organophosphate derivatives based on QSAR (Quantitative Structure-Activity Relationship) analytical model has been conducted. Organophosphate derivative compounds and their activities were obtained from the li... see more