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All Journal CHEMISTRY PROGRESS Jurnal Natur Indonesia Jurnal Sains dan Teknologi Jurnal Riset Kimia Alchemy Jurnal Penelitian Kimia Jurnal Penelitian Pendidikan IPA (JPPIPA) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia Jurnal Kesehatan dan Sains STIKES Griya Husada Sumbawa Rengganis Jurnal Pengabdian Masyarakat Jurnal Pijar MIPA Jurnal Pepadu

Dedy Suhendra

Program Studi Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Mataram, Jalan Majapahit No. 62, Mataram

Author-ID : 389575

Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Dentistry Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Materials Science & Nanotechnology Mathematics Nursing Physics Public Health Social Sciences Other

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WAX ESTERS PRODUCTION BY ALCOHOLYSIS OF PALM OIL FRACTIONS Erin Ryantin Gunawan; Dedy Suhendra
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

The lipase synthesis of wax esters using palm oil fractions (palm oil and palm kernel oil) and long chain alcohol as substrates was carried out. The present work focuses on the synthesis of wax esters using Lipozyme. Five parameters such as reaction time, temperature, amount of enzyme, molar ratio of substrates and various organic solvents of the reaction system were investigated. The optimum yields were achieved at the reaction temperature of 40 - 50 °C for palm oil (PO) and 40 °C for palm kernel oil (PKO) alcoholysis, a reaction time of 5 - 7 h for PO and 7 - 10 h for PKO alcoholysis, 0.15 g of enzyme for both PO and PKO alcoholysis, molar ratio at 3:1 (alcohol: PO or PKO), and the best solvent for the reactions was hexane. Percentage yields of esters obtained at these optimum reaction conditions was 83% refined, bleached and deodorized (RBD) palm oil alkoholysis and 87% for RBD palm kernel oil alcoholysis respectively

FOUR-FACTOR RESPONSE SURFACE OPTIMIZATION OF THE ENZYMATIC SYNTHESIS OF WAX ESTER FROM PALM KERNEL OIL Erin Ryantin Gunawan; Dedy Suhendra
Indonesian Journal of Chemistry Vol 8, No 1 (2008)
Publisher : Universitas Gadjah Mada

The synthesis of wax ester using refined, bleached and deodorized (RBD) palm kernel oil (PKO) and oley alcohol catalyzed by Lipozyme IM was carried out. Response surface methodology (RSM) based on a five-level, four-factor central composite rotatable design (CCRD) was used to evaluate the interactive effects of synthesis, of reaction time (5-20 h), temperature (20-50 oC), amount of enzyme (0.1-0.2 g) and substrate molar ratio (palm kernel oil to oleyl alcohol, 1:1-1:5) on the percentage yield of wax esters. The optimum condition conditions derived via RSM were reaction time 8.46 h, temperature 44.4 oC, amount of enzyme 0.182 g, substrate molar ratio 1 to 3.7. The actual experimental yield was 92.9 % under optimum condition, which good accordance to the maximum predicted value of 92.4 %.

SEPARATION AND PRECONCENTRATION OF COPPER (II) ION BY FATTY HYDROXAMIC ACIDS IMMOBILIZED ONTO AMBERLITE XAD – 4 RESIN Dedy Suhendra; W. M. Z. Wan Yunus; Md. Jelas Haron; Mahiran Basri; Sidik Silong
Indonesian Journal of Chemistry Vol 6, No 2 (2006)
Publisher : Universitas Gadjah Mada

A method of copper (II) ion preconcentration and separation from other ions by using a column containing fatty hydroxamic acids - loaded Amberlite XAD 4 resin (FHA-Amb) is described. Several factors, which affect the separation and preconcentration efficiency such as pH, sample volume, and concentration of eluent and flow rate, have been investigated. A quantitative recovery of copper (II) ion from FHA-Amb resin column was obtained using 10% HNO3 solutions as eluent with a preconcentration factor of 60. A method for separation of Cu(II) from Zn(II) and Cd(II) is proposed. A rapid sample throughput, a clean separation, a high preconcentration factor and simplicity are the main advantages in these analytical procedures.

Co-Authors Ali Djamhuri Anggi Solehah Ariani, Dwi dhony hermanto Dhony Hermanto Dina Asnawati Dwi Ariani Emmy Yuanita Erin Ryantin G Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan Erin Ryantin Gunawan I Made Aditha Jurnal Pepadu Lely Kurniawati Mahiran Basri Mahiran Basri Md. Jelas Haron Murniati Murniati Nurhidayanti . Nurlaila Agustikawati Nurlaila Agustikawati Pujana Qurba Qurba, Pujana Rizka Dhia Khalilah Bali Ryantin G, Erin Sidik Silong Siska Ayu Wulandari Siska Ayu Wulandari, Siska Ayu Sri Seno Handayani Sri Seno Handayani Sri Seno Handayani W. M. Z. Wan Yunus Yayuk Andayani

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Journal : Indonesian Journal of Chemistry