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All Journal Jurnal Riset Kimia Indonesian Journal of Clinical Pathology and Medical Laboratory (IJCPML)
S. Ibrahim
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Biochemistry, Genetics & Molecular Biology Chemistry Health Professions Medicine & Pharmacology Neuroscience

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STUDI PENGARUH WAKTU, SUHU DAN JUMLAH DEHIDRATOR PADA DEHIDRASI RISINOLEAT MINYAK JARAK DENGAN P2O5 M. Sitorus; S. Ibrahim; H. Nurdin; D. Darwis
Jurnal Riset Kimia Vol. 4 No. 1 (2010): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i1.70

Abstract

 The aims of study are to optimize the reaction’s parameters i.e. time, temperature, and amount of dehydrator’s agent on the dehydration of ricinoleic of castor oil into dehydrated castor oil (DCO) by mean P2O5. DCO is the mixed of linoleic acid (LA) and conjugated linoleic acid (CLA). Dehydration were carried out using various of time, temperature, and amount of dehydrator. The reaction medium was maintained under vacuum, gentle bubbling with nitrogen, magnetically stirred and used Zn’s powder as antipolymerization’s agent. The changes composition of DCO were analyzed by GC, and identification by FTIR and GC-MS and compared to CLA’s standard. Best result were obtain for 4 h, at 200°C and 3% (w/w) P2O5. DCO compositions were : 1.02% of (9c/t – 12c/t) linoleic; 41.97% of (9c/t – 12t/c) linoleic ; 19.50% of (9c/t – 11t/c) CLA ; 19.79% of (9t – 11t) CLA; and 0.90% of residual’s of ricinoleic. The yields of dehydration was 98.98%, and the decreased 92.98% intensities of –OH wives number in FTIR spectra’s castor oil comparison with DCO to indicated transform of ricinoleic by dehydration. Both wave number of alkenes (C=C) at FTIR DCO spectra was indicated to formed of conjugated alkenes (CLA). The ratio of CLA : linoleic was 0.92 : 1 with achievement of 63.5% relatively to CLA standard with ratio of CLA : linoleic was 1.45 : 1. Keywords: Time, Temperature, Amount of dehydrator, Dehydration of ricinoleic   
ANALISIS TEMUAN BASIL TAHAN ASAM PADA SPUTUM CARA LANGSUNG DAN SEDIAAN KONSENTRASI PADA SUSPEK TUBERKULOSIS Elisabeth Frida; S. Ibrahim; Hardjoeno Hardjoeno
INDONESIAN JOURNAL OF CLINICAL PATHOLOGY AND MEDICAL LABORATORY Vol 12, No 2 (2005)
Publisher : Indonesian Association of Clinical Pathologist and Medical laboratory

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24293/ijcpml.v12i2.844

Abstract

Tuberculosis is still an important health problem in Indonesia, being the third place in the world. The diagnosis could be done bydirect microscopic method of slides stained with Ziehl Neelsen. The finding of AFB could be improved by decontaminating the specimensto provide a concentrated sample. To analyze the findings of AFB through microscopy and concentrated smear methods, comparing ofeach to bacteriological culture. Diagnosis was done on 148 patients during May to September 2005, using microscopic method (directmicroscopy and concentrated smear) and culture. Analysis of results was done by using SPSS for Window v. 11.5. Of the 148 specimens,15 (10.1%) and 55 (37.2%) positive AFB were found in direct microscopy and concentrated smears respectively. The sensitivities indirect microscopy and concentrated smears were 22% and 64.8%, while the specificities were 96.8% and 78.7%, positive predictivevalues (PPV) were 80% and 63.6%, negative predictive values (NPV) 68.4% and 79.5%, accuracy values were 69.5% and 73.6%. Thespecificity and PPV were higher in direct microscopic method, while positive value, sensitivity, NPV and accuracy value were higher indecontamination, concentrated sample method. Concentrated sample method will increase the accuracy of the finding of Ziehl NeelsenstainedAFB so that this method could be assumed better for use.
Co-Authors D. Darwis Elisabeth Frida H. Nurdin Hardjoeno Hardjoeno M. Sitorus