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All Journal KOVALEN: Jurnal Riset Kimia Stannum : Jurnal Sains dan Terapan Kimia Jurnal Inovasi Pendidikan dan Sains Jurnal Riset Pembelajaran Kimia
Isna Lailatusholihah
Sekolah Tinggi Analis KImia Cilegon
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Antioxidant Potential of Ethanol Extract from Mango Parasite (Dendrophthoe petandra) to Maintain Crude Palm Oil (CPO) Quality Ninik Triayu Susparini; Rohmatulloh; Boima Situmeang; Isna Lailatusholihah; Siti Rohmiyati
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15954

Abstract

The present study aimed to determine the effectiveness of adding natural antioxidants from ethanolic extract of mango parasite (Dendrophthoe petandra) to oxidation stability of crude palm oil (CPO) during storage. The parameters tested were levels of free fatty acid (FFA), acid values, and deterioration of bleachability index (DOBI). The antioxidant activity of D. petandra extract obtained was IC50 of 6.369 ppm. Concentrations of D. petandra extract range from 200 to 1000 ppm. Based on the results, the ethanolic extract of D. petandra was able to reduce the FFA and acid value and increase the DOBI compared to the negative control. The lowest FFA levels and acid numbers were obtained from samples with addition of 1000 ppm natural antioxidants with FFA of 4.2% and acid value of 7.4 mg KOH/g, while the DOBI value increased to 1.300.
Validation of Boron Analytical Methods on Standard Reference Material Tomato Leaves from NIST No. 1573a with Isothermal Distillation by UV-Vis Spectrophotometry Isna Lailatusholihah; Roto; Agus Kuncaka; Ninik Triayu Susparini
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 2 (2022): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i2.15955

Abstract

Boron analysis by UV-Vis spectrophotometry has been developed through distilling triethoxy borane into the curcumin solution. In the distillation of ester borane, an esterification reaction occurs between borate and ethanol. Validation of isothermal distillation methods by UV-Vis spectrometry needs to be done to obtain specific, accurate, and reproducible results. The distillation for 24 hours at 25°C gave the optimum result. UV-Vis spectrophotometry wavelength was 535 nm. The standard curve was linear in the concentration range of 1-5 ppm (R2 = 0.9995) with a sensitivity of 0.0902 ppm-1, a limit of detection of 0.002±0.001 ppm, the limit of quantification of 0.006±0.001 ppm, and percent recovery of 88%.
Cholesterol Lowering Activity from Methanol Extract of Bidara Leaves (Ziziphus mauritiana) Isna Lailatusholihah; Weny JA Musa; Lintang Panji Setyoko; Holisha Widiyanto; Nurhayati Bialangi; Boima Situmeang
Stannum : Jurnal Sains dan Terapan Kimia Vol 5 No 1 (2023): April 2023
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v5i1.3847

Abstract

Research on qualitative test of secondary metabolites compounds and test of lowering cholesterol activity has been done on bidara leaves (ziziphus mauritiana) with methanol extract by maceration methods. The aim of this research was to determine cholesterol-lowering activity of methanol extract on bidara leaves (ziziphus mauritiana). The procedure used was in this study consisted of extraction, phytochemicals screening such as alkaloids, tannins, triterpenoids, flavonoids and saponins, and test of cholesterol lowering activity using UV-Vis spectrophotometry at a wavelength of 423 nm. Based on research results, determine cholesterol lowering activity of methanol extract on bidara leaves (ziziphus mauritiana) has proven to reduce cholesterol levels by 80.4598% because of bidara leaves contains of active secondary metabolites such as triterpenoids, tannins and flavanoids.
PENGEMBANGAN STOP MOTION CHEMISTRY SEBAGAI MEDIA PEMBELAJARAN AUDIO VISUAL MATERI LAJU REAKSI UNTUK PESERTA DIDIK SMA/MA Isna Lailatusholihah; Susila Kristianingrum
Jurnal Riset Pembelajaran Kimia Vol 5, No 3 (2016): Volume 5, No 3, Edisi 3 tahun 2016
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jrpk.v5i3.3788

Abstract

Tujuan penelitian ini adalah untuk mengembangkan Stop Motion Chemistry sebagai media pembelajaran audio visual materi laju reaksi dan menentukan kualitasnya. Kualitas Stop Motion Chemistry ditentukan berdasarkan penilaian lima guru kimia SMA/MA sebagai reviewer.Penelitian ini menggunakan model pengembangan prosedural yang meliputi empat tahapan: perencanaan, pengorganisasian, pelaksanaan, dan penilaian produk. Stop Motion Chemistry materi laju reaksi ditinjau dan mendapatkan masukan dari dosen pembimbing, peer reviewer, ahli materi, dan ahli media. Stop Motion Chemistry dinilai oleh lima reviewer yaitu guru kimia SMA/MA. Penilaian dilakukan menggunakan instrumen penilaian berupa angket yang meliputi 5 komponen dengan 25 kriteria.Hasil penelitian berupa produk Stop Motion Chemistry dengan materi pokok laju reaksi yang dikemas dalam CD (Compact Disc) dan data kualitas produk Stop Motion Chemistry. Stop Motion Chemistry terdiri atas empat bagian yaitu: pembukaan, penggolongan materi, isi, dan penutup. Berdasarkan penilaian lima reviewer, Stop Motion Chemistry mempunyai kualitas sangat baik (SB) menurut kriteria penilaian ideal ditinjau dari komponen kelayakan materi dan kelayakan tampilan media dengan skor rata-rata berturut-turut yaitu 29,4 dari skor maksimal 35 dan 40,4 dari skor maksimal 45, serta mempunyai kriteria baik (B) ditinjau dari komponen kelayakan bahasa, kelayakan audio media, dan kemanfaatan dengan skor rata-rata berturut-turut yaitu 16,2 dari skor maksimal 20; 8,4 dari skor maksimal 10; dan 12 dari skor maksimal 15.
TOBACCO LEAVES EXTRACT (Nicotiana tabacum) AS A NATURAL CORROSION INHIBITOR OF CARBON STEEL Micha Mahardika; Ninik Triayu Susparini; Isna Lailatusholihah
Jurnal Inovasi Pendidikan dan Sains Vol 5 No 3 (2024): December
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v5i3.2033

Abstract

Tobacco leaves have great potential as corrosion inhibitors due to the chemical compounds present in tobacco leaf extracts that play a role in inhibiting the corrosion rate, specifically tannins. The objective of this study was to determine the corrosion rate value and efficiency of tobacco leaf extract as an inhibitor on corrosion coupons exposed to a sulfuric acid solution. The initial step involves preparing smooth corrosion coupons and tobacco leaves. The tobacco leaves were prepared by extracting them through a maceration method using ethanol solvent over a 5-day period. A corrosive media solution of 1 M H2SO4 and corrosion coupons measuring 0.1 x 1.3 x 7.65 cm were also prepared. Subsequently, both the corrosion coupons and tobacco leaf extract were soaked in an acidic solution for the initial sample. The highest tannin content was found in the tobacco leaf extract using ethanol solvent (in a ratio of 1:6), yielding 31.35%. At the highest concentration of 800 ppm, the corrosion rate of the tobacco leaf extract was measured at 17.36 mm/year. Additionally, the inhibition efficiency of the tobacco leaf extract in the corrosive medium, a 1 M H2SO4 solution, reached 89.82% at a concentration of 800 ppm, with a soaking time of 5 days.
Co-Authors Agus Kuncaka Boima Ramses Situmeang Boima Situmeang Holisha Widiyanto Lintang Panji Setyoko Micha Mahardika Nurhayati Bialangi Rohmatulloh Roto Siti Rohmiyati Susila Kristianingrum Susparini, Ninik Triayu Weny JA Musa