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All Journal Cakrawala Pendidikan Jurnal Ilmu Dasar AGRIVITA, Journal of Agricultural Science Jurnal Tadris Kimiya Unesa Journal of Chemistry Journal of Innovative Science Education Jurnal Sains dan Teknologi Pangan
Asep Kadarohman
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Energy Materials Science & Nanotechnology Mathematics

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GROWTH PROCESS OF ORGANIC VETIVER ROOT WITH POTATO AS INTERCROPPING PLANT Kadarohman, Asep; Eko S., Ratnaningsih; Dwiyanti, Gebi; Lailatul K., Lela; Kadarusman, Ede; Nur F., Ahmad
AGRIVITA, Journal of Agricultural Science Vol 34, No 1 (2012)
Publisher : Faculty of Agriculture University of Brawijaya and Indonesian Agronomic Assossiation

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Abstract

Vetiver oil (Vetiveria zizanoides) is one of Indonesia main export commodities. Vetiver root is perennial plant and generally planted with vegetables as intercropping plant. Increasing the selling price of vetiver oil can be done by transferring the production of conventional vetiver oil (non-organic) to organic vetiver oil. Demonstration of land used was one hectare, which 2,000 m2 for planting vetiver root with potato (Solanum tuberosum) as inter-cropping plant and 8,000 m2 for vetiver root without intercropping, in Sukakarya-Samarang, Garut. The planting used goat and cow dung as manure, distillate water of vetiver oil and liquid bio-pesticide as pesticide. Variables studied included plant height, number of leaf and crotch. In the first quarter of the years, the number of leaf and crotch of vetiver root with intercropping was better than vetiver root without inter-cropping. However, there was not significant difference for plant height of vetiver root, both with and without intercropping. Products of organic potato as intercropping plant of vetiver root were less than those of non-organic potato, but the latter had a better texture and durability.   Keywords: Vetiveria zizanoides, Solanum tube-rosum, intercropping, organic farming
EFEKTIVITAS PEMBELAJARAN STEREOKIMIA BERBASIS VISUALISASI 3D MOLEKUL UNTUK MENINGKATKAN KEMAMPUAN SPASIAL M. Setyarini; Liliasari Liliasari; Asep Kadarohman; Muhamad A. Martoprawiro
Jurnal Cakrawala Pendidikan CAKRAWALA PENDIDIKAN EDISI FEBRUARI 2017, TH. XXXVI, NO. 1
Publisher : LPMPP Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2891.953 KB) | DOI: 10.21831/cp.v36i1.11082

Abstract

Abstrak: Penelitian ini bertujuan menyelidiki keefektifan program pembelajaran stereokimia berbasis visualisasi 3D molekul menggunakan salah satu chemical drawing software berbasis open source yakni Avogadro, dan animasi kekiralan melalui komputer untuk meningkatkan kemampuan  spasial mahasiswa calon guru. Studi menggunakan quasi experimental control group pretest-posttest design. Instrumen penelitian terdiri dari 25 soal pilihan ganda disertai alasan, disusun berdasarkan indikator tiga dimensi utama  kemampuan spasial. Penelitian dilaksanakan di satu LPTK di Provinsi Lampung,  semester ganjil Th. Akademik 2014/2015. Subjek penelitian terdiri dari kelas kontrol dan kelas eksperimen, masing-masing ada sebanyak 30 mahasiswa.  Hasil penelitian menunjukkan bahwa  rata-rata skor post test kemampuan spasial kelompok mahasiswa dengan pembelajaran stereokimia berbasis visualisasi 3D molekul secara signifikan lebih tinggi dibandingkan kelompok mahasiswa yang media pembelajarannya menggunakan molymod. Keefektifan program ditunjukkan oleh peningkatan N-gain dalam kategori sedang dan efek size (d) dalam kategori tinggi untuk ketiga dimensi utama kemampuan spasial.  Kata kunci: stereokimia, visualisasi 3D, kemampuan spasial, software open-source, THE EFFECTIVENESS OF STEREOCHEMISTRY BASED ON 3D VISUALIZATION OF MOLECULES IN IMPROVING SPATIAL ABILITY Abstract: The purpose of this study is to investigate the effectiveness of stereochemistry learning programs based on 3D visualization of molecules using the open source chemical drawing softwares, Avogadro, and animation of chirality to improve spatial ability of teacher candidates. This study used a quasi-experimental control group pretest-posttest design. The research instrument consisted of 25 multiple choice questions along with the reasons elaboration, composed based on three major indicator dimensions of spatial ability. The research was conducted at a LPTK in Lampung Province, in the first semester of Academic Year 2014/2015. The subjects consisted of control class and experimental class, each of which consisted of 30 students. The results showed that the average post-test scores of spatial ability of students learning stereochemistry based on 3D visualization of molecules was significantly higher than the group of students learning using molymood media. The effectiveness of the program was shown by the increase in N-gain in the medium category and effect size (d) in high category for the three main dimensions of spatial ability. Key words: stereochemistry, 3D visualization, spatial ability, open-source software
PROFIL KEMAMPUAN BERINKUIRI SISWA SMA PADA TOPIK PENGARUH PERUBAHAN SUHU TERHADAP SISTEM KESETIMBANGAN KIMIA Yuli Handayanti; Wahyu Sopandi; Asep Kadarohman
Jurnal Tadris Kimiya Vol 1, No 2 (2016)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jta.v1i2.1249

Abstract

Kinetics of Complex Reaction of Eugenol Hydrogenation to 2-Methoxy-4-Propylphenol in Pd/Y Catalyst Asep Kadarohman
Jurnal ILMU DASAR Vol 11 No 1 (2010)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (597.627 KB)

Abstract

Eugenol and isoeugenol hydrogenations using Pt, Pd, Ni as a single or combined metal, that was supported on X and Y zeolite have been carried out. The experiment result showed that in hydrogenation reaction using metal that was supported on zeolite, eugenol is more easily hydrogenated than isoeugenol. Pd metal that was supported on Y zeolite as a catalyst in eugenol hydrogenation is more effective than Ni, Pt or combined metal (Pt,Pd,Ni/X). The highest conversion selectivity of eugenol hydrogenation is in 6% catalyst of Pd (10%)/Y that produced 98.24% of 2-methoxy-4- propylphenol. Kinetic of reaction is very important data that is needed in processing for industry scale, because kinetic can show how fast the starting material is converted into products. In this research, kinetic of the reaction was done by eugenol hydrogenation at 245oC with variation of time using Pd/Y catalyst. The result shows that eugenol hydrogenation is a complex reaction, because the reaction yields not only 2-methoxy-4-propylphenol as a main product, but also cis-isoeugenol and trans-isoeugenol as the side products. The reaction pathway of eugenol hydrogenation in Pd/Y catalyst is a combination of parallel and consecutive pathway and pseudo first order reaction with k = 0.5509.
Determination of Optimum Programmed Temperature for Fatty Acid Analysis of Chlorella Microalgae Extract Using GCMS Instrument surani surani; Cahyo Pujiasmoro; Asep Kadarohman
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.814 KB) | DOI: 10.26740/ujc.v12n1.p20-25

Abstract

Gas Chromatography-Mass Spectrometry (GCMS) column temperature is one of the variables that must be considered in the analysis of chemical compounds, so that the compounds are appropriately separated. This study aims to determine the optimum programmed temperature for fatty acid analysis using the GCMS instrument. The fatty acid samples used were derived from the extract of Chlorella microalgae. Chlorella microalgae extraction was done by sonication for 60 minutes using hexane as solvent. The GCMS programmed temperature variations were carried out, namely the temperature increase was 5 OC /minute, 7 OC/minute, 9 OC/minute, 12 OC/minute with an initial temperature of 80 OC and a final temperature of 270 OC. The number of samples injected was 0.2 mL. The data from the analysis is processed by comparing the retention time and analysis time. It was found that the optimum condition for the programmed temperature measurement was the initial temperature of 80 oC and an increase of 9 OC/minute to a temperature of 270 OC with an analysis time of 21.1 minutes. The fatty acids in Chlorella microalgae extract are palmitic acid, oleic acid and stearic acid. By using this measurement method, the analysis time is shortened and the expected compounds can be identified properly Keywords: Analysis, GCMS, programmed temperature, fatty acids, Chlorella microalgae
Development and Validation of a Three-Tier Test for Identifying Misconceptions in Organic Chemistry Course Febliza, Asyti; Asep Kadarohman; Siti Aisyah; Norazilawati Abdullah
Journal of Innovative Science Education Vol. 13 No. 3 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jise.v13i3.13578

Abstract

Misconceptions about organic chemistry topics still exist among university students. Identifying these misconceptions requires appropriate instruments. This study aims to develop and validate a three-tier test instrument for identifying misconceptions in organic chemistry lectures. The topics covered in the test include alkenes, alkynes, aromatic compounds, alkyl halides, alcohols, and ethers. This research follows a design and development approach, specifically adopting a product and tool research type with a focus on tool development & use, where validity is a research design concern. A total of 42 three-tier items were developed, combining multiple-choice questions with open reasoning and Certainty of Response Index (CRI) technique for confidence level assessment using a scale of 0, 1, 2, 3, 4, and 5. The content validity test by three expert judgments showed an average I-CVI of 0.98, with an average item proportion of 0.98. These results showed test item were valid. The test items were piloted with 25 students to examine empirical validity, resulting in 40 valid items and 2 invalid items. The Cronbach's Alpha reliability test yielded a value of 0.953, indicating very high reliability for the three-tier test instrument. Therefore, the three-tier test instrument can be used effectively to collect data and detect student misconceptions in organic chemistry lectures.
ENKAPSULASI MINYAK ATSIRI DENGAN KITOSAN SEBAGAI AGEN ANTIBAKTERI PADA KEMASAN MAKANAN: REVIEW Ramiz Hasbi; Randu Cahya Putra; Asep Kadarohman
Jurnal Sains dan Teknologi Pangan Vol. 10 No. 5 (2025): Jurnal Sains dan Teknologi Pangan
Publisher : Jurusan Ilmu dan Teknologi Pangan Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63071/ms0cec33

Abstract

Kebutuhan akan kemasan pangan yang aman serta mampu memperpanjang umur simpan produk melalui sifatantibakteri mendorong pengembangan teknologi enkapsulasi minyak atsiri dalam kitosan. Artikel ini bertujuan membahaspenelitian terkait pemanfaatan berbagai jenis minyak atsiri dalam matriks kitosan sebagai kemasan pangan dan efektivitasnyasebagai agen antibakteri. Artikel ini disusun menggunakan metode tinjauan pustaka dengan sumber data dari artikel jurnalnasional dan internasional yang diperoleh melalui Google Scholar, Sciencedirect, dan PubMed, terbitan tahun 2012–2025.Hasil penelusuran awal menemukan 214.837 artikel, kemudian setelah proses penyaringan diperoleh 33 artikel yang relevandengan topik kajian. Analisis deskriptif dilakukan untuk membahas mekanisme kerja enkapsulasi minyak atsiri dalam kitosan,khususnya dalam menghambat pertumbuhan bakteri serta peranannya pada kemasan pangan. Hasil kajian menunjukkanbahwa enkapsulasi minyak atsiri dalam biopolimer kitosan, baik dalam bentuk edible coating maupun edible film, dapatmeningkatkan aktivitas antibakteri melalui mekanisme pelepasan terkontrol serta interaksi elektrostatik antara kitosan dandinding sel bakteri. Beberapa minyak atsiri yang berpotensi sebagai agen antibakteri antara lain peppermint, citrus,lemongrass, oregano, cardamom, jahe, jintan, Artemisia fragrans, Paulownia tomentosa, kayu manis, rosemary, bawang putih(Allium sativum), lada hitam, thyme, dan basil, yang dapat diaplikasikan pada kemasan pangan seperti buah-buahan, filletikan, dan daging olahan.
Co-Authors Ahmad Nur F. Cahyo Pujiasmoro Ede Kadarusman febliza, asyti Gebi Dwiyanti Lela Lailatul K. Liliasari , M. Setyarini Muhamad A. Martoprawiro Norazilawati Abdullah Ramiz Hasbi Randu Cahya Putra Ratnaningsih Eko S. RR. Ella Evrita Hestiandari Siti Aisyah Wahyu Sopandi Yuli Handayanti