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All Journal Jurnal Riset Kimia Katalis Pendidikan: Jurnal Ilmu Pendidikan dan Matematika
H. Nurdin
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Chemistry Education Mathematics Other

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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   
Penerapan Model Pembelajaran Berbasis Proyek Pada Mata Pelajaran Seni Budaya Untuk Meningkatkan Minat Dan Kreativitas Siswa Kelas IVA UPT SPF SD Inpres Tamamaung IV Kota Makassar Nurmia Nurmia; H. Nurdin; Roslyn Roslyn
Katalis Pendidikan : Jurnal Ilmu Pendidikan dan Matematika Vol. 1 No. 2 (2024): Juni : Katalis Pendidikan : Jurnal Ilmu Pendidikan dan Matematika
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/katalis.v1i2.246

Abstract

The main problem in this research is in learning activities where based on observations that have been made it was found that problems exist in class IVA, namely that there are still some students who have a lack of interest in learning and their level of creativity is also lacking because the teacher still uses conventional methods. So the author decided to conduct research in this class to make improvements using a project-based learning model. This research aims to determine the application of the project-based learning model to increase the interest and creativity of class IVA UPT SPF SD Inpres Tamamaung IV students, Makassar City. This type of research is Classroom Action Research (PTK) which includes four stages, namely planning, implementation, observation and reflection. The subjects of this research were 22 students in class IVA UPT SPF SD Inpres Tamamaung IV, Makassar City. This research instrument uses teacher activity observation sheets, student interest observation sheets and student creativity observation sheets. Then this data is analyzed using the average formula. From the results of this research, the average results of observation of teacher activities in cycle I were 56% (Poor) with an increase in cycle II of 90% (Very Good). The results of observing student interest in the first cycle were 69% (fairly good) and increased in the second cycle by 89% (very good). Meanwhile, student creativity also increased, in cycle I with a percentage of 74.43% (Medium Creativity) and experienced an increase in cycle II with a percentage of 80.10% (High creativity). Thus, the project-based learning model can increase student interest and creativity in Arts and Culture subjects. with material on Simple Comics and Making Curtains from Used Materials in class IVA UPT SPF SD Inpres Tamamaung IV Makassar City.
Co-Authors D. Darwis M. Sitorus Nurmia Nurmia Roslyn Roslyn S. Ibrahim