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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Ilmiah Pendidikan Scholastic Journal Of Research and Education Chemistry (JREC) MASALIQ: Jurnal Pendidikan dan Sains
Sri Benti Etika
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Religion Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology Social Sciences

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Optimasi pH dan Waktu Kontak dalam Adsorpsi Methylene Blue dengan Ekstrak Kulit Rambutan Sridevitri Sridevitri; Sri Benti Etika
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6822

Abstract

The development of the textile industry in Indonesia produces hazardous waste, including toxic, carcinogenic, non-biodegradable Methylene Blue, which threatens aquatic ecosystems and human health. Adsorption is a simple and low-cost method widely used to reduce this pollution. This study aims to determine the effectiveness of flavonoid extracts from rambutan peel (Nephelium lappaceum L.) in adsorbing Methylene Blue, identify optimal adsorption conditions, and assess adsorption capacity. Analysis of the flavonoid extract using FTIR showed absorption peaks at 3265.13 cm-1 indicating O-H, at 2971.20 cm-1 indicating aliphatic C-H, and at 2280-2080 cm -1 detected C≡C or C≡N, at 1703.06 cm -1, C=O is detected at wavenumbers 1607.35 and 1519.01 cm-1, aromatic C=C is detected at wavenumbers 1446.51 and 1287.45 cm-1, C-O-C is detected at wavenumbers 1186.59 cm -1 detection of C-O-C or C-O-H bending at wavenumbers 874.50 and 751.93 cm-1 detection of aromatic C-H. The adsorption of Methylene Blue by flavonoid extracts is more consistent with the Langmuir isotherm, with a coefficient of determination (R) value of 0.996. The results of the study showed that the optimum conditions for Methylene Blue absorption occurred at pH 5 at 10.4825876 mg/g and at the optimum contact time of 80 minutes at 10.9669 mg/g.
Analisis Proksimat pada Batubara (Ash Content) di Laboratorium PT Superintending Company of Indonesia (SUCOFINDO) Cabang Padang Salsabila Salsabila; Sri Benti Etika
MASALIQ Vol 5 No 5 (2025): SEPTEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i5.7502

Abstract

Indonesia possesses economically valuable coal deposits distributed across the Tertiary basins of the western Sunda Shelf, particularly on the islands of Sumatra and Kalimantan, positioning the country as one of the world’s leading coal producers. This study aims to determine the ash content of coal samples from various mining sites. Samples were analyzed using the proximate analysis method to measure parameters including total moisture (TM), inherent moisture (IM), ash content (ASG), and fixed carbon (FC). This method enables the identification of variations in coal characteristics resulting from differences in mining origins. The results indicate that TM, IM, ASG, and FC levels vary across samples, reflecting differences in geological conditions and coal quality. The total moisture and fixed carbon values obtained from crucible 1 and crucible 2 were both recorded at 6%. The study concludes that coal characteristics differ by source, and proximate analysis provides a valuable preliminary insight into quality assessment. These findings serve as a foundation for developing more accurate and efficient coal analysis methods and offer a reference for industrial applications and energy research.
Uji Aktivitas Antioksidan dari Ekstrak Kubis Ungu (Brassica oleracea) Dafnesy Rahmadhani Putri; Sri Benti Etika
MASALIQ Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i6.7780

Abstract

Unhealthy lifestyles and environmental conditions have become key contributors to the increased production of free radicals in the body, which are linked to the development of various degenerative diseases. To counteract these effects, the body requires antioxidant compounds capable of neutralizing free radicals. Brassica oleracea (purple cabbage) is a vegetable known to contain bioactive compounds, particularly flavonoids, with potential as natural antioxidants. This study aims to determine the antioxidant activity of concentrated purple cabbage extract. The DPPH (2,2-diphenyl-1-picrylhydrazyl) method was employed, with extraction carried out through maceration using methanol as the solvent. Antioxidant activity was tested at various concentrations to determine the IC₅₀ value. The results showed that purple cabbage extract exhibited moderate antioxidant activity, with an IC₅₀ value of 144.170 mg/L. These findings indicate that purple cabbage holds promise as a natural antioxidant source, with potential applications in functional food and pharmaceutical development.
Co-Authors Aminullah Mimi Darwati Budhi Oktavia Dafnesy Rahmadhani Putri Edi Nasra Elfanny Delvia Fitri Amelia Hardeli Hardeli Hary Sanjaya Hesty Parbuntari Muhammad Patly Nurul Afifah Rahmi Randy Lesmana Putra Ranti Septiana Rita Sundari Riva Silvia Salsabila Salsabila Silvani Indriani Manalu Sridevitri Sridevitri Suryelita . Umar Kalmar Nizar Yusnita Pitri Mayenti