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Tehubijuluw, Helna
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Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science

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Synthesis of Binuclear Complex Compound of {[Fe(L)(NCS)¬2]2oks} (L = 1,10-phenantrolin and 2,2’-bypiridine) Male, Yusthinus T; Tehubijuluw, Helna; Pelata, Paulina M.
Indonesian Journal of Chemical Research Vol 1 No 1 (2013): Edisi Pertama (First Edition)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2013.1-yus

Abstract

The paramagnetic complex {[Fe(fen)(NCS)2]2oks} have been synthesized in methanol solution using 1-10 phenantrolin, 2,2 '-bipyridine, NCS- ligands and oxalate as bridging ligand. Synthesis of Fe (II) with ligands phenantrolin produced three complexes is paramagnetic compounds each with a value of magnetic moment (μ) of 5.98 BM, 7.34 BM and 6.00 BM, respectively. For complexes with bipyridine ligand complexes obtained two diamagnetic compounds with the magnetic moment (μ) was 3.57 BM and 3.50 BM, respectively. It could concluded that the field strength of bipyridine ligand cannot be reduced by NCS- ligand. Analysis results showing that the synthesized compound is a binuclear complex with {[Fe(fen)(NCS)2]2oks} molecular formula. This conclusion was supported by the measurement of conductivity, magnetic moment, IR spectroscopy and XRD analysis.
Biosorpsi Ion Logam Kadmium (Cd2+) Pada Biosorben Rumput Laut Coklat (Padina australis) Asal Pantai Liti Pulau Kisar Bijang, Catherina M.; Tehubijuluw, Helna; Kaihatu, Terence Ghereds
Indonesian Journal of Chemical Research Vol 6 No 1 (2018): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2018.6-cath

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The research about biosorption of Cadmium (Cd2+) metal ion in brown seaweed biosorben (Paladina australis) from Liti beach, Kisar island has been done. Analysis of decreasing Cd2+ content using Atomic Absorption Spectrophotometer (SSA) and also use FTIR to know functional groups contained in alginate compounds. A total of 0.5 g of brown seaweed powder was introduced into 25 mL of Cd2+ 50 ppm solution with variations of pH 1-7 and shaker for five hours. After the optimum pH was obtained, the adsorption process was applied on pH 5 solution with variation of contact time 1, 3, and 5 hours, after which it was filtered. The result of analysis and calculation showed that Cd2+ ion was optimum at pH 5 of 99.64% and 3 hours contact time was 74.54%.
Karakterisasi Biopolimer Kitosan Hasil Deasetilasi Limbah Kepiting Rajungan (Portunus Sanginolentus) Menggunakan NaBH4 Dalam NaOH Hasanela, Nurani; Tanasale, Matheis F.J.D.P.; Tehubijuluw, Helna
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-nur

Abstract

The chitosan isolation from crab crab waste (Portunus sanginolentus) has been carried out. Chitin production is carried out by the de-proteination, demineralization and depigmentation processes. Chitosan biopolymer is produced from chitin through de-acetylation method using base solution (NaOH) and the addition of NaBH4 which aims to increase the degree of de-acetylation (DD) of chitosan. The results of 25 g of chitin obtained chitosan amounted to 16.67 g (66.68%). Chitin and Chitosan were identified by a Fourier Transform Infrared (FT-IR) spectrophotometer.
Co-Authors Bijang, Catherina M. Hasanela, Nurani Kaihatu, Terence Ghereds Matheis F.J.D.P. Tanasale Pelata, Paulina M. Yusthinus T. Male