Jurnal Kartika Kimia

The Utilization of Anthocyanin Extract from Parijoto (Medinilla speciosa) as a Sensitizer in Dye-Sensitized Solar Cells (DSSC)

Nila Tanyela Berghuis, Menawari Perangin Perangin, Richard Reynchak Tandawuya — Sun, 01 Dec 2024 10:15:48 +0800

The research on the Utilization of Anthocyanin Extract from Parijoto (Medinilla speciosa) as a Sensitizers in Dye Sensitized Solar Cell (DSSC) aims to identify the presence of anthocyanin compounds in parijoto fruit and determine how much power can be generated from anthocyanin compounds as sensitizers in DSSC using variations of ethanol, methanol, ethanol-citric acid (50:50), methanol-citric acid (50:50) solvents through the maceration method for 48 hours. The highest yield was the methanol-citric acid extract from the fruit, which was 16.35%. Positive results in the identification of anthocyanin compounds that were dripped with NaOH showed a color change from red to green-blue and when dripped with HCl there was no color change. The results of the functional group characterization of the fruit ethanol extract through FTIR (Fourier Transform Infrared) analysis showed the presence of -OH groups, -C=C aromatic and -CO alcohol at a wave number of 3293 cm^-1, 1644 cm^-1, and 1019 cm^-1, while from the GCMS (Gas Chromatography Mass Spectrometry) analysis in the fruit ethanol extract there was a cyanidin structural framework at a retention time of 12.24 minutes with a value (m/z) of 243, and an area% of 1.09%. The power measurement on the fruit ethanol extract was 0.1516 mW and on the fruit ethanol-citric acid extract was 0.023 mW. The power generated indicates that the parijoto fruit extract has the potential as a sensitizer in the Dye-Sensitized Solar Cell (DSSC) application.

The Effect of Ethanol-Water Solvent Variation on the Antioxidant Activity of Tempeh Extract

Thu, 23 Jan 2025 03:10:42 +0800

Indonesia has a variety of processed food products made from beans, one of which is tempeh. A traditional Indonesian dish, tempeh is made from soybeans (Glycine max). The bioactive isoflavones contained in tempeh possess phenolic groups that contribute to its antioxidant properties. In addition to isoflavones, compounds such as superoxide dismutase and tocopherol also exhibit antioxidant activity. This study aimed to evaluate the antioxidant activity of tempeh extracts by varying the concentrations of ethanol in the solvent: 96% ethanol, 70% ethanol, 50% ethanol, 30% ethanol, and water. Extraction was performed using ultrasonic-assisted extraction, and antioxidant activity was assessed using the DPPH method, both qualitatively (via dynamolysis and TLC) and quantitatively (using UV-Visible spectrophotometry). The results from the qualitative antioxidant tests using dynamolysis and TLC showed potential antioxidant activity, evidenced by a yellow color change after the sample was sprayed with 0.2% DPPH reagent. Quantitative UV-Visible spectrophotometric testing with quercetin as a standard yielded an IC₅₀ value of 2.86 µg/mL. The IC₅₀results for the extracts in decreasing order of ethanol concentration were as follows: 96% ethanol extract (2638.49 µg/mL), 70% ethanol extract (2559.49 µg/mL), 50% ethanol extract (2288.65 µg/mL), 30% ethanol extract (1945.54 µg/mL), and water extract (2946.45 µg/mL). The highest antioxidant activity was observed in the 30% ethanol tempeh extract, while the lowest antioxidant activity was found in the water extract. These findings indicate that tempeh extracts exhibit antioxidant activity, which varies depending on the ethanol-water solvent composition.

Antioxidant and Anticancer Activities of Ethanol, n-Hexane, Ethyl Acetate, and Hydroethanolic Extracts of Kalanchoe marmorata (Crassulaceae)

Nur Mala, Yenny Febriani Yun, Lilis Siti Aisyah — Sun, 26 Jan 2025 10:21:42 +0800

Kalanchoe marmorata merupakan salah satu jenis cocor bebek yang mengandung alkaloid, flavonoid, tanin dan steroid yang berpotensi sebagai antioksidan dan antikanker. Daun K, marmorata diekstraksi berturut-turut dengan etanol, n-heksana, etil asetat dan etanol udara. Terhadap ekstrak ke-4 tersebut dilakukan uji antioksidan dan antikanker. Pengujian antioksidan menggunakan metode 1,1-difenil-2-pikrihidazil (DPPH), terhadap ekstrak etanol dengan nilai IC50 _sebesar 122,1 ppm, ekstrak n-heksana IC50 ₁₈₀ ppm, ekstrak etil asetat IC50 ₁₂₁ ppm dan ekstrak etanol air IC50 _{191, 9} ppm Dari ke-4 uji aktivitas antioksidan, ekstrak etanol dan etil asetat merupakan ekstrak yang paling aktif. Sementara itu, pengujian antikanker dilakukan dengan metode reduksi resazurin, pada ekstrak etanol dengan nilai IC ₅₀ sebesar 159,90 µg/mL, ekstrak n-heksana IC ₅₀ 563,40 µg/mL, ekstrak etil asetat IC ₅₀ 480,50 µg/mL , dan ekstrak etanol udara IC ₅₀ > 1000 µg/mL dari 4 pengujian aktivitas antikanker, ekstrak etanol dan etil asetat yang paling aktif.

Synthesis of Composite ZnO-Zeolite and Its Application as Adsorbent: A Systematic Review

Jessica Veronica, Mamun Mollah, Budiman Anwar, Galuh Yuliani — Sat, 07 Dec 2024 06:24:28 +0800

This article aims to determine the most effective ZnO-zeolite synthesis method for use as an adsorbent. The effectiveness of the ZnO-zeolite synthesis method includes the methods of synthesis, characterization, and adsorption. This study is a literature search using Google Scholar and Science Direct with the keywords “ZnO”, “zeolite”, “synthesis”, and “adsorption” taken from the last 10 years (2013-2023). Twenty-six articles were obtained, and selection was carried out so that 12 articles were obtained. There were 4 methods for ZnO-zeolite synthesis: (1) sol-gel, (2) impregnation, (3) coprecipitation, and (4) hydrothermal methods. The synthesis of ZnO-zeolite products was characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM), and their adsorption capacity was tested via UV-Vis spectroscopy. The hydrothermal synthesis method is the most effective method for the synthesis of ZnO-zeolite because it does not consume a large amount of energy, is a simple synthesis procedure, and has a large adsorption power. The resulting ZnO-zeolite has a crystal size of 1.540 mm and can adsorb up to 657.895 mg/g of the adsorbate).