cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Dina Kartika Maharani
Contact Email
dinakartika@unesa.ac.id
Phone
+628174140131
Journal Mail Official
dinakartika@unesa.ac.id
Editorial Address
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231
Location
Kota surabaya,
Jawa timur
INDONESIA
Unesa Journal of Chemistry
  • unesa-journal-of-chemistry
  • Website
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 22528180     DOI : https://doi.org/10.26740/ujc.v11n2
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 119 Documents
 8   9   10   11   12 
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

Abstract

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.
PENGARUH VARIASI POLYVINYL ALCOHOL (PVA) TERHADAP KARAKTERISTIK MEMBRAN KITOSAN TERMODIFIKASI SEBAGAI SLOW-RELEASE FERTILIZER (SRF) PUPUK NPK dinda putri aliyanti; 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.p53-59

Abstract

The use of conventional NPK fertilizers in the agricultural sector results in relatively low nutrient utilization efficiency due to losses through volatilization, nitrification, and leaching. One effort to address this issue is the development of NPK fertilizers with controlled nutrient release, or slow-release fertilizers. This study aims to determine the effect of varying Polyvinyl Alcohol (PVA) content on the characteristics of SRF membranes. The membranes were synthesized using the solvent casting method, in which the membrane solution was poured into petri dishes and the solvent was evaporated to produce dry SRF membranes. The results showed that as the PVA content added to the SRF matrix increased, the mass ranged from 0.0573 to 0.0602 grams. The degree of swelling produced by the four variations ranged from 106.19% to 134.09%. The resulting porosity ranged from 0.20% to 0.40%. This indicates that the addition of PVA affects the physical characteristics of the membrane.
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

Abstract

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.
ANALISIS KADAR COD PADA LIMBAH AIR LINDI MENGGUNAKAN SISTEM MEMBRANE BIO REACTOR (MBR) DI TPA SUPIT URANG KOTA MALANG Risky Amalia; I Gusti Made Sanjaya
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.p42-45

Abstract

Leachate is a highly polluted liquid generated from landfill waste and requires proper treatment before being discharged into the environment. This study aims to analyze the changes in Chemical Oxygen Demand (COD) levels in leachate wastewater before and after treatment using a Membrane Bioreactor (MBR) system at Supit Urang Landfill, Malang City. The research was conducted at the laboratory of the Waste Management Unit (UPT) of Malang City. Four sampling points were analyzed, namely Measuring Device A (MDA), inlet pump, outlet pump, and Measuring Device B (MDB). COD analysis was carried out using a thermoreactor and colorimeter and was performed in duplo for the same sample. The results showed a significant decrease in COD levels from 3460 mg/L at MDA to 96 mg/L at MDB after treatment through the MBR system with reduction efficiency of approximately 97.2%. This reduction indicates that the MBR system effectively removes organic pollutants in leachate wastewater. The final COD value meets the environmental quality standard set by the Indonesian regulation (maximum 300 mg/L). Therefore, the MBR system can be considered an effective technology for leachate wastewater treatment.
EVALUASI UJI KUALITAS BIODIESEL DARI MINYAK JELANTAH MELALUI REAKSI TRANSESTERIFIKASI MENGGUNAKAN NANOKATALIS CaO/MgO Amartia Cindi Oktaviani; Dina Kartika Maharani; Samik
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.p79-86

Abstract

The world's primary energy supply is still predominantly dependent on fossil fuels. One renewable energy source that can be utilized to address this issue is biodiesel. In Indonesia, palm oil production increased by 89.8% during the 2018–2022 period, leading to a rise in the generation of waste cooking oil, which has significant potential as a feedstock for biodiesel production. This study aimed to evaluate the quality of biodiesel produced from waste cooking oil. Biodiesel was synthesized through a transesterification reaction conducted for 90 minutes at 50°C, using a methanol-to-waste cooking oil molar ratio of 7:1, with 1 wt.% CaO/MgO nanocatalyst relative to the weight of the waste cooking oil. The catalyst compositions, namely MgO, 20CaO/MgO, 30CaO/MgO, and 40CaO/MgO, were employed as independent variables. Biodiesel quality was evaluated based on density according to ASTM D1289, kinematic viscosity according to ASTM D445, acid value according to ASTM D664, and water content according to ASTM D6751. The results showed that the biodiesel produced using MgO, 20CaO/MgO, 30CaO/MgO, and 40CaO/MgO nanocatalysts met the required quality standards. Among the catalysts tested, biodiesel synthesized using the 20CaO/MgO nanocatalyst exhibited the highest yield, reaching 80.10%.
Ekstraksi Natrium Silikat dengan NaOH pada Abu Sekam Padi dari Limbah Pertanian di Kecamatan Gedangan, Jawa Timur, dan Kuantifikasi Kadar Silikanya dengan Metode Spektrofotometri Molybdenum Biru Kariza Alya Aulia Firdaus; Amaria
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.p60-70

Abstract

Rice husk is an agricultural waste with potential as a silica source due to its high silica content after ashing. This study aimed to quantitatively determine the silica content in NaOH extract of rice husk ash obtained from agricultural waste in Gedangan District, East Java, using the molybdenum blue spectrophotometric method. The rice husk was washed, dried, ashed at 700 ℃ for 4 h, and sieved to pass 200 mesh. Silica extraction was carried out through acid leaching with HCl, chelation with Na2EDTA, and dissolution using 3.5 M NaOH under reflux for 1 h to produce sodium silicate solution. Silica content was determined by UV-Vis spectrophotometry at 810 nm using a silica standard curve of 0.2–1.8 mg/L. The ashing process yielded an average ash yield of 21.18% with 0.72% RSD, indicating good consistency. The silica analysis of the extract showed average values of 1482.30 mg/L for sample 1 and 1133.09 mg/L for sample 2. These results indicate that rice husk ash from Gedangan District, East Java, has potential as a source of dissolved silica through alkaline extraction.
Artikel Review: Analisis Komparatif Bahan Tambahan pada Bioplastik Berbasis Kulit Singkong dengan Penambahan Gliserol dan Ekstrak Daun Sirih sebagai Antibakteri Nur Handini Prisma Kustanti; Nuniek Herdyastuti
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.p87-96

Abstract

This study discusses the effect of additives on the performance of cassava peel–based bioplastics and the antibacterial effectiveness of films enriched with betel leaf extract. The analyzed parameters include water absorption, tensile strength, biodegradability, and overall film performance. The results show that glycerol produced the most flexible and balanced film, with water absorption of 15.09%, tensile strength of 1.16 MPa, and biodegradability of 60.8%. Cellulose generated mechanically strong films (7.48 MPa) but with rigid characteristics, while chitosan produced less flexible films with a tensile strength of 5.42 MPa. The addition of betel leaf extract demonstrated strong antibacterial activity, with an inhibition zone of up to 24.74 mm against Streptococcus mutans. The combination of glycerol-based bioplastic and betel leaf extract shows potential as a flexible, balanced, and active film for packaging applications.
Black Garlic: Kandungan Senyawa Bioaktif, dan Bioaktivitasnya Fistara Lesti Rahmafitria; Nuniek Herdyastuti
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.p97-111

Abstract

Black garlic is a processed garlic product (Allium sativum L.) produced through controlled heating at high temperatures and humidity for a specific period. This process causes distinctive sensory changes, including a black color, a softer texture, a sweeter flavor, and a less pungent aroma compared to fresh garlic. These thermal changes lead to chemical changes, such as a decrease in allicin and an increase in more stable bioactive compounds such as S-allyl-L-cysteine ​​(SAC), polyphenols, flavonoids, and Maillard reaction products. These compositional changes are closely related to various bioactivities of black garlic, especially antioxidant activity, followed by anti-inflammatory, antidiabetic, anticancer, antimicrobial, and cardiovascular and metabolic effects. Research reports still show high data heterogeneity due to differences in processing conditions, raw material varieties, analytical methods, and biological models used. Furthermore, available scientific evidence is still limited to analytical, in vitro, and animal studies, while clinical evidence in humans is still very limited. This article reviews the manufacturing process, physicochemical and chemical changes, bioactive content, bioactivity, and research gaps in black garlic as a basis for developing garlic-based functional foods.
Sintesis Hijau Nanopartikel TiO2 Menggunakan Ekstrak Daun Belimbing Wuluh (Averrhoa blimbi L.) dan Aktivitas Antibakterinya Terhadap Escherichia coli Nur Azizah Wanda Triyaruhana; Dina Kartika Maharani
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.p112-119

Abstract

TiO2 nanoparticles were successfully synthesized by biosynthesis method specifically green synthesis method using Averrhoa bilimbi L. (bilimbi) leaf extract as both a reducing and capping agent. The purpose of this study was to characterize the synthesized TiO2 nanoparticles and its antibacterial activity against the Gram-negative bacteria Escherichia coli. Characterization was carried out using Fourier-Transform Infrared Spectroscopy (FTIR) and X-Ray Powder Diffraction (XRD). The synthesized TiO2 nanoparticles exhibited an anatase phase, with an average crystallite size of 12.9 nm and a crystallinity of 97.81%. Antibacterial activity tests against Escherichia coli across various samples Ti-BW20 and Ti-BW40, yielded inhibition zone diameters of 7.82 mm and 9.87 mm, respectively.

Page 12 of 12 | Total Record : 119

 8   9   10   11   12 

Filter by Year

2020 2026


Reset
Filter By Issues
All Issue Vol. 15 No. 3 (2026): Vol 15 No 3 (2026): On progress Vol. 15 No. 2 (2026): Vol 15 No 2 (2026) Vol. 15 No. 1 (2026): Vol 15 No 1 Vol. 14 No. 3 (2025): Vol 14 No 3 (2025) Vol. 14 No. 2 (2025): Vol 14 No 2 (2025) Vol. 14 No. 1 (2025): Vol 14 No 1 (2025) Vol. 13 No. 3 (2024): Vol 13 No 3 (2024) Vol. 13 No. 2 (2024): Vol 13 No 2 (2024) Vol. 13 No. 1 (2024): Vol 13 No 1 (2024) Vol. 12 No. 3 (2023): Vol 12 No 3 (2023) Vol. 12 No. 2 (2023): Vol 12 No 2 (2023) Vol 12 No 1 (2023) Vol 11 No 3 (2022) Vol 11 No 2 (2022) Vol 11 No 1 (2022) Vol 10 No 3 (2021) Vol 10 No 2 (2021) Vol 10 No 1 (2021) Vol 9 No 3 (2020) More Issue