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All Journal Walisongo Journal of Chemistry ALKIMIA : Jurnal Ilmu Kimia dan Terapan KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia
Fahmi, Jam’an
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Social Sciences

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COMPARATIVE GC–MS CHARACTERIZATION AND PHYSICOCHEMICAL EVALUATION OF Citrus hystrix DC. ESSENTIAL OILS FROM DIFFERENT PLANT PARTS Ramadhan, Dwi Sapri; Warsito, Warsito; Azzahra, Vina Octavia; Wardana, Dian; Fahmi, Jam’an; Safitri, Wulan Dwi
Walisongo Journal of Chemistry Vol. 8 No. 2 (2025): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v8i2.28063

Abstract

Essential oils from Citrus hystrix DC. are known for their rich bioactive composition, particularly citronellal, which has extensive applications in the fragrance and pharmaceutical industries. However, comparative studies on the chemical and physicochemical properties of oils extracted from different plant parts remain limited. This study investigated essential oils obtained by steam distillation from leaves (LEO), twigs (TEO), and a leaf–twig mixture (LTMEO). The oils were characterized using GC–MS and FTIR analyses, alongside measurements of density, refractive index, and yield. LTMEO yielded a yellow, aromatic oil with a density of 0.856 g/mL, a refractive index of 1.439, and a yield of 0.60%, consistent with the quality requirements of SNI 9231:2023. GC–MS profiling identified citronellal as the dominant compound, with concentrations of 83.88% in LEO, 69.88% in LTMEO, and 46.47% in TEO. FTIR spectra confirmed the presence of aldehyde functional groups, consistent with the high citronellal content. Minor constituents such as linalool (5.24–8.91%), isopulegol (0.47–2.95%), β-citronellol (2.03–12.22%), and citronellyl acetate (4.28–6.48%) were also detected, potentially affecting citronellal isolation. Overall, the findings highlight C. hystrix DC. leaves as the most promising source of citronellal for industrial applications.
ntesis Perekat Kayu Lignin–Urea Formaldehida (LUF) Berbasis Lignin yang Diekstraksi dari Tandan Kosong Kelapa Sawit (TKKS Dian Wardana; Eddiyanto; Nurfajriani; Dwi Sapri Ramadhan; Wulan Dwi Safitri; Jam'an Fahmi
ALKIMIA Vol 10 No 1 (2026): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ccj7gm39

Abstract

Oil palm empty fruit bunches are one of the underutilized plantation wastes. Lignin is one of the components of plant cell walls besides cellulose and hemicellulose that can be used as a raw material for the synthesis of lignin-based adhesives, namely lignin-urea-formaldehyde (LUF) adhesive resins. The polymerization reaction of LUF formation was confirmed from the shift and change in the FTIR wavenumber of the -CO-ether group of LUF compared to UF and LF obtained during the synthesis process. The tensile strength test results of all adhesives produced exceeded the tensile strength value of commercial UF adhesives, and it was found that increasing the lignin concentration in the synthesized adhesives was directly proportional to the tensile strength value. Increasing the lignin concentration was also able to reduce formaldehyde emissions from all variations of adhesives produced, but was unable to exceed the lower formaldehyde emission value of UF adhesives.
PENGEMBANGAN LKPD SIFAT KOLIGATIF LARUTAN BERBASIS PBL UNTUK MENGUKUR KETERAMPILAN BERPIKIR KRITIS PESERTA DIDIK Jaman Fahmi; Budiman Anwar; Wulan Dwi Safitri; Dwi Sapri Ramadhan; Dian Wardana; Dimas Ridho; Ekin Dwi Arif Kurniawan; Ahmad Fauzi Syahputra Yani
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 9 No 1 (2026): Jurnal Katalis Volume 9 Nomor 1 Tahun 2026
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v9i1.13597

Abstract

This study aims to develop a PBL (Problem-Based Learning) based Student Worksheet (LKPD) on the topic of colligative properties of solutions that are valid, reliable, and feasible to be used as an instrument for assessing students’ critical thinking skills. This research employed a Type 1 Design and Development Research (DDR) model consisting of the stages of Analysis, Design, Development, Try-out, and Evaluation, although its implementation was limited to the Try-out stage. The study involved validators comprising university lecturers and chemistry teachers, as well as 106 twelfth-grade science students from MAN 2 Model Medan selected through purposive sampling. Data were collected using semi-structured interview guidelines and assessment questionnaires and subsequently analyzed using the Content Validity Ratio (CVR), Content Validity Index (CVI), item validity tests, reliability analysis, item difficulty index, discrimination index, normality, and homogeneity tests. The findings indicate that out of 16 initial items, 11 essay items were found to be valid (Pearson Corelation > 0,3) and reliable with internal reliability coefficients categorized as good (Cronbach’s Alpha > 0.7). The difficulty indices of the items ranged from difficult to easy, with discrimination indices categorized as moderate to very good. Therefore, the developed PBL-based LKPD is deemed feasible for use in measuring students’ critical thinking skills in the context of colligative properties of solutions.
Co-Authors Ahmad Fauzi Syahputra Yani Azzahra, Vina Octavia Budiman Anwar Dian Wardana Dian Wardana Dimas Ridho Dwi Sapri Ramadhan Dwi Sapri Ramadhan Eddiyanto Kurniawan, Ekin Dwi Arif Nurfajriani Ramadhan, Dwi Sapri Safitri, Wulan Dwi Wardana, Dian Warsito Warsito Wulan Dwi Safitri Wulan Dwi Safitri