Garuda - Garba Rujukan Digital

Functionalization of L-Cystein On Magnetite As Magnetic Adsorbent Metals for SDG 14 Amaria Amaria; Dina Kartika Maharani; Amalia Putri Purnamasari; Sari Edi Cahyaningrum; Aisha Setiyanti
Journal of Current Studies in SDGs Vol. 3 No. 1 (2027): March
Publisher : Sekolah Tinggi Agama Islam Sabilul Muttaqin Mojokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63230/jocsis.3.1.251

Objective: The increasing consumption of gold (Au) in the electronics, catalysis, and medical sectors has led to the depletion of primary ore resources while increasing the accumulation of electronic waste (e-waste) which reaches 62 million tons per year globally. Therefore, the development of selective, efficient, and environmentally friendly Au(III) recovery technology from secondary sources is very urgent. This study aims to synthesize and characterize magnetic adsorbents based on magnetite (Fe3O4@Cys) functionalized with L-Cysteine (Fe3O4@Cys) and evaluate its performance in the recovery of Au(III) ions from aqueous solutions. Method: L-Cysteine was chosen because it contains a thiol group (-SH) which has a high affinity for Au(III) based on the hard-soft acid-base (HSAB) theory. The synthesis was conducted through silica coating followed by L-cysteine immobilization using GPTMS as a coupling agent. Results: FTIR analysis confirmed the presence of Fe–O, Si–O–Si, and Si–OH groups, indicating successful functionalization. XRD results showed that the magnetite crystal structure was retained after modification, with a crystallite size of 16.43 nm and the presence of amorphous silica. Novelty: The synthesized Fe3O4@Cys exhibited good acid stability, demonstrating its potential as a selective magnetic adsorbent for Au(III) recovery from secondary resources.

SINTESIS DAN KARAKTERISASI HIDROGEL KITOSAN-LIDAH BUAYA (Aloe vera)-LENDIR BEKICOT (Achatina fulica) Emelia Amanda Agustin; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 15 No. 2 (2026): Vol 15 No 2 (2026)
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 | DOI: 10.26740/ujc.v15n2.p46-52

Hydrogels are topical formulations designed to be more practical in promoting faster wound healing. Hydrogels must possess characteristics such as biocompatibility, non-toxicity, sensitivity to the physiological environment, and good flexibility. These characteristics open up opportunities for hydrogels to be applied in biomedicine through combinations of materials that have synergistic effects. This study was conducted to synthesize hydrogels by combining chitosan, aloe vera, and snail mucus. In this study, hydrogels were synthesized with varying additions of aloe vera at 5, 10, and 15% (w/w), followed by physical and chemical characterization. The results showed that increasing the amount of aloe vera added increased the spreadability and decreased the adhesion of the hydrogel. The characterization test results showed a spreadability range of 5,07–5,34 cm and an adhesion time of 16–44 seconds.

Sintesis dan Karakterisasi Hidrogel Kitosan-Minyak Jintan Hitam (Nigella sativa L.)-Lendir Bekicot (Achatina fulica) Shabrina Dwi Ardinimia; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 15 No. 3 (2026): Vol 15 No 3 (2026): On progress
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 | DOI: 10.26740/ujc.v15n3.p71-78

Wounds that are not treated promptly can become infected with bacteria, which prolongs the healing process. The bacterial species most commonly associated with wound infections is Staphylococcus aureus, found in 6.3% to 56.6% of wound infection cases. One preventive measure against infection is the application of topical preparations containing antibacterial compounds such as chitosan, black cumin oil, and snail mucus. This study aims to synthesize and characterize hydrogel formulations based on chitosan, black cumin oil, and snail mucus. The hydrogels were prepared in four formulations with varying concentrations of black cumin oil: F0 (0%), F1 (5%), F2 (7%), and F3 (9%). The characterization included physical property tests, such as spreadability, adhesion, and homogeneity. As well as chemical property tests, including pH measurement and functional group analysis using FTIR. The results showed that all formulations exhibited homogeneous physical characteristics and met the standards for topical preparations. The hydrogels’ spreadability met the ideal criteria (5,18 ± 0,01 – 5,38 ± 0,02 cm), and their adhesion increased with rising black cumin oil concentration (32,67 ± 0,58 – 59,00 ± 1,00 seconds). The hydrogels’ pH values ranged from 6,16 ± 0,03 to 6,89 ± 0,01, which is consistent with skin pH. Functional group analysis revealed the presence of O-H, N-H, C-H, C=O, C=C, C-O, and C-N stretching vibrations. These hydrogel formulations demonstrate promising initial physicochemical characteristics, although further biological evaluation is still required.

Functionalization of L-Cystein On Magnetite As Magnetic Adsorbent Metals for SDG 14 Amaria Amaria; Dina Kartika Maharani; Amalia Putri Purnamasari; Sari Edi Cahyaningrum; Aisha Setiyanti
Journal of Current Studies in SDGs Vol. 3 No. 1 (2027): March
Publisher : Sekolah Tinggi Agama Islam Sabilul Muttaqin Mojokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63230/jocsis.3.1.251

Objective: The increasing consumption of gold (Au) in the electronics, catalysis, and medical sectors has led to the depletion of primary ore resources while increasing the accumulation of electronic waste (e-waste) which reaches 62 million tons per year globally. Therefore, the development of selective, efficient, and environmentally friendly Au(III) recovery technology from secondary sources is very urgent. This study aims to synthesize and characterize magnetic adsorbents based on magnetite (Fe3O4@Cys) functionalized with L-Cysteine (Fe3O4@Cys) and evaluate its performance in the recovery of Au(III) ions from aqueous solutions. Method: L-Cysteine was chosen because it contains a thiol group (-SH) which has a high affinity for Au(III) based on the hard-soft acid-base (HSAB) theory. The synthesis was conducted through silica coating followed by L-cysteine immobilization using GPTMS as a coupling agent. Results: FTIR analysis confirmed the presence of Fe–O, Si–O–Si, and Si–OH groups, indicating successful functionalization. XRD results showed that the magnetite crystal structure was retained after modification, with a crystallite size of 16.43 nm and the presence of amorphous silica. Novelty: The synthesized Fe3O4@Cys exhibited good acid stability, demonstrating its potential as a selective magnetic adsorbent for Au(III) recovery from secondary resources.

PENGGUNAAN KITOSAN-POLIVINIL ALKOHOL (PVA)-KALSIUM KARBONAT SEBAGAI MATRIKS UREA SLOW-RELEASE FERTILIZER (SRF) Nanda Onky Stefani; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
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 | DOI: 10.26740/ujc.v14n1.p1-7

Slow-release fertilizer (SRF) is a method used to improve the efficiency of nutrient absorption, particularly urea, which is essential for plants during the early growth stages. This study aims to develop and characterize SRF urea modified with chitosan–polyvinyl alcohol (PVA) incorporating various concentrations of calcium carbonate. The SRF urea was prepared in membrane form and characterized through swelling and porosity tests, as well as urea release analysis over 30 days using UV-Vis spectrophotometry. The results showed that increasing calcium carbonate concentration affected the SRF’s physical properties and urea release rate. The SRF urea formulation labeled C1 exhibited optimal characteristics, with a swelling capacity of 202,5% and porosity of 15,6%, indicating its ability to regulate water diffusion effectively. SRF urea C1 released 72% of its urea content over 30 days, which was higher than that of formulations C2 and C3, yet still maintained controlled-release behavior. Therefore, a calcium carbonate concentration of 0.01% is considered optimal for producing an SRF urea formulation with both high and controlled urea release, suitable for application as a chitosan–PVA-based slow-release fertilizer.

Sintesis dan Karakterisasi Urea Slow Release Fertilizer (SRF) dengan Matriks Kitosan Termodifikasi PVA/CaCO3 Yasfin Shafa Nurulisia; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025)
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 | DOI: 10.26740/ujc.v14n1.p8-14

Urea fertilizer is widely used in the agricultural due to its high content of nitrogen (±46%). However, only 30-40% of nitrogen that is effectively absorbed by plants, while the remainder is lost to the environment. Therefore, the development of SRF offers a potential solution to improve the efficiency utilization of urea fertilizer. In this study, urea based SRF was successfully synthesized using the casting method which is the urea with concentration of 0, 1000, 2000 and 3000 ppm was coated with chitosan which modified by PVA/CaCO3. In addition to synthesis, the urea SRF was also characterized through swelling and porosity test showed that the higher the concentration of urea that added, the lower of swelling degree and %porosity of the urea SRF. Meanwhile, the result of the urea release test indicated that when the urea concentration increased led to a higher urea release rate, resulting in a greater percentage of urea release.

PENGARUH PVA PADA PEMBUATAN PUPUK UREA SLOW RELEASE FERTILIZER PADA MATRIKS KITOSAN TERMODIFIKASI Betari Marena; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 13 No. 3 (2024): Vol 13 No 3 (2024)
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 | DOI: 10.26740/ujc.v13n3.p83-88

Slow Release Fertilizer can be made with organic or inorganic materials. Several materials have been compared in their properties to produce SRF membranes that have the most suitable properties to be made as SRF. In this study, SRF was made with chitosan-PVA-Urea-Ca materials with the aim of increasing the efficiency of urea fertilizer absorption by plants. The method used in making this SRF is the casting method, the membrane solution will be spread on a surface and the solvent will be evaporated so that a dry SRF membrane can be produced. The results of the study showed that the more PVA added, the degree of swelling can be increased, its elasticity can be increased, and its porosity can be reduced so that it can increase the efficiency of urea absorption by plants

Title

Found 7 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 7 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 7 Documents
Search