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INDONESIA
Indonesian Journal of Chemistry and Environment
Published by Universitas Negeri Yogyakarta
ISSN : -     EISSN : 25993186     DOI : 10.21831
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Materials Science & Nanotechnology
Articles are welcome that deal with theoretical analysis, meta-anaysis reviews, and result of research or empirical studies from all aspect of Chemistry and Environment. Reports on new methodologies and comprehensive assessments of existing ones, as well as applications to new types of problems are especially welcome. Experimental papers are expected to be brought into relation with theory, and theoretical papers should be connected to present or future experiments. Manuscripts that apply routine use or minor extensions or modifications of established and/or published experimental and theoretical methodologies are appropriate if they report novel results for an important problem of high interest and/or if they provide significant new insights.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 85 Documents
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ANTIOXIDANT ACTIVITY AND TOXICITY OF THE ETHYL ACETATE AND DICHLOROMETHANE FRACTIONS OF THE ETHANOL EXTRACT OF SIKKAM LEAVES (Bischofia javanica Blume) Putu Widiari; I Wayan Muderawan; Rachmadhani Rachmadhani
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97531

Abstract

Sikkam (Bischofia javanica Blume) is traditionally used to treat sore throat, infected wounds, boils, and diabetes, but scientific evidence remains limited. This study aimed to determine the antioxidant activity and toxicity of the ethyl acetate and dichloromethane fractions of sikkam leaf ethanol extract obtained by maceration. Antioxidant activity was assessed using the DPPH method, and toxicity was evaluated using the BSLT method with Artemia salina larvae. The IC₅₀ values of the ethyl acetate and dichloromethane fractions were 4.13 µg/mL and 26.19 µg/mL (both very strong), respectively, while the LC₅₀ values were 1152.99 µg/mL (non-toxic) and 686.61 µg/mL (moderate), respectively. Both fractions demonstrated very strong antioxidant activity, with the ethyl acetate fraction exhibiting greater potential and being non-toxic, whereas the dichloromethane fraction showed moderate toxicity.
Well Water Quality Assessment Around Ciangir Landfill, Tasikmalaya City, Using the Pollution Index Tegar Muhammad Mikdar; Melly Mellyanawaty
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97570

Abstract

Shallow groundwater around landfill should be monitored because landfill leachate may transport dissolved solids, organic matter, and metals into residential water sources. This study evaluated well water quality around the Ciangir Landfill, Tasikmalaya City, using pH, temperature, iron (Fe), manganese (Mn), and turbidity, and determined water quality status using the Pollution Index. Nine wells were purposively selected at 0 m, 50 m, and 100 m from the landfill area and were sampled during dry and rainy seasons. The results showed that pH was acidic at several points, while Fe generally remained below the 1 mg/L standard. Mn exceeded the 0.5 mg/L standard at point A1, particularly in the dry season, and high turbidity occurred at several points during the rainy season. The average Pollution Index was 0.8991, indicating compliance with the standard, although the dry-season value reached 1.0394 and was classified as slightly polluted. Periodic monitoring and improved leachate management are required to prevent further deterioration of local well water.
APPLICATION OF HEMATITE SYNTHESIZED FROM IRON RUST WASTE AS A PIGMENT DYES FOR COTTON TEXTILE PRINTING Asiyah Nurrahmajanti; Octianne Djamaludin; Wulan Safrihatini Atikah
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97711

Abstract

Iron rust is an abundant waste material with potential to be utilized as an iron oxide pigment. While previous studies have focused on its synthesis, its application in textile printing remains limited. This study evaluates the performance of hematite (Fe₂O₃) derived from iron rust waste as a pigment for cotton fabric printing. The pigment was incorporated into a conventional printing formulation and applied onto cotton fabric. Color strength (K/S), CIELAB properties, and fastness to washing and rubbing were evaluated with five replicates to ensure data reliability. The results show a slight increase in K/S from 1.13 ± 0.09 to 1.22 ± 0.10 with increasing synthesis concentration, although the difference remains moderate. The printed fabrics exhibited consistent reddish-yellow hues and low variability in colorimetric values, indicating good reproducibility. Washing fastness was acceptable (grade 3 for color change; 4–5 for staining), while rubbing fastness ranged from 2–4. These findings demonstrate that rust-derived hematite is applicable as a pigment in textile printing. However, performance is influenced by pigment–binder interaction, indicating the need for further optimization to improve color strength and durability.
Yield, Antioxidant Activity, and Toxicity of Ethanol Extracts from Air- and Sun-Dried Sikkam Leaves (Bischofia javanica Blume) Obtained by Maceration and Soxhlet Extraction I Wayan Muderawan; Nia Astria Br. Saragih; I Wayan Mudianta
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.97771

Abstract

Sikkam (Bischofia javanica Blume) is a species of the genus Bischofia in the Euphorbiaceae family that can be used as a traditional medicine. This study aimed to determine the yield, antioxidant activity, and toxicity of sikkam leaf extract. Sikkam leaves were dried at room temperature (air-dried) and under direct sunlight (sun-dried). The extracts were obtained using the maceration and Soxhlet extraction methods with 96% ethanol as the solvent. The yields of air-dried (A-D) and sun-dried (S-D) sikkam leaf extracts isolated by maceration and Soxhlet extraction differed significantly (p<0.05), with average values of 20.48±2.30, 22.32±1.19, 24.31±2.01 and 24.71±0.09% for A-D maceration, S-D maceration, A-D Soxhlet extraction, and S-D Soxhlet extraction, respectively. The antioxidant activity (IC50) of sikkam leaf extracts, tested using the DPPH method, showed significantly different mean values (p<0.05), with the following averages: 11.13±1.30, 12.86±2.88, 11.36±1.47, and 14.82±1.19 µg/mL for A-D maceration, S-D maceration, A-D Soxhlet extraction and S-D Soxhlet extraction, respectively. The ethanol extracts of air-dried and sun-dried sikkam leaves isolated via maceration and Soxhlet extraction fall into the category of very strong antioxidant activity. The toxicity (LC50) of the sikkam leaf extracts tested using the Brine Shrimp Lethality Test (BSLT) differed significantly (p<0.05), namely 941±37, 914±67, 985±72 and 700±39 µg/mL for A-D maceration, S-D maceration, A-D Soxhlet extraction and S-D Soxhlet extraction, respectively. Ethanol extracts of air-dried and sun-dried sikkam leaves, isolated by maceration and Soxhlet extraction, are classified as non-toxic.
Development of a Heyzine E-Module Integrating Cassava Fermentation Ethnoscience for Acid-Base Chemistry Kharisma Eka Yulianti Eka; Bayu Saputra; Gamilla Nuri Utami
Indonesian Journal of Chemistry and Environment Vol. 9 No. 1 (2026): JUNE 2026
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v9i1.99354

Abstract

Understanding acid-base concepts remains challenging for many students because these concepts are abstract and often disconnected from everyday experiences. This study aimed to develop and evaluate a Heyzine Flipbook-assisted e-module integrating cassava fermentation ethnoscience to support acid-base chemistry learning. The study employed a Research and Development (R&D) approach based on the Borg and Gall model. The developed e-module integrated interactive digital features, ethnoscience-based contexts, and multimedia elements to promote meaningful learning experiences. The product was validated by material and media experts, while its practicality and effectiveness were evaluated through teacher responses, student responses, and pretest-posttest assessments. The validation results indicated that the e-module was highly valid, with average scores of 92.51% from material experts and 91.88% from media experts. The practicality evaluation showed very positive responses from teachers (91.88%) and students (89.64%). Furthermore, students’ learning outcomes improved significantly, as reflected by the increase in the mean score from 41.39 on the pretest to 73.33 on the posttest. The normalized gain (N-gain) score was 0.54, indicating a moderate level of effectiveness in improving students’ understanding of acid-base concepts. These findings suggest that integrating ethnoscience and digital learning technology through a Heyzine Flipbook-assisted e-module provides an innovative, contextual, and effective learning resource for chemistry education.

Page 9 of 9 | Total Record : 85

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