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Moondra Zubir
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INDONESIA
Indonesian Journal of Chemical Science and Technology
Published by Universitas Negeri Medan
ISSN : 26221349     EISSN : 26224968     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal ini mempublikasikan artikel di bidang Kimia yang meliputi penelitian dasar dan terapan. Bentuk Publikasi di Indonesian Journal of Chemical Science and Technology : * Artikel * Review (berdasarkan permintaan Dewan Redaksi) * Communication (berdasarkan permintaan Dewan Redaksi)
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 270 Documents
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FTIR Spectra Analysis to Confirm the Epoxidation Reaction of Castor Oil Trilita Putri Halasson Sihite; Marham Sitorus
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.69574

Abstract

Study This aim For confirm success reaction epoxidation oil distance (Ricinus communis Linn ) through analysis Epoxidation FTIR spectroscopy done use sour synthesized performance​ in a way in situ from formic acid with hydrogen peroxide . Reaction done using catalyst sour sulfate at a temperature of 70 o C and a time of 90 minutes . The reaction epoxidation is transformation group alkenes become epoxide or oxirane that is something ether cyclical member three . FTIR analysis can used For identify change group function main reactants and products .. From the results FTIR analysis then alkene (C = C) absorption at 1655 cm -1 is qualitatively transformed into castor oil epoxy with the appearance of C - O - C (epoxy ether) absorption at 1015 cm -1 for stretching and 858 cm -1 for bending . The decrease intensity absorption C=C alkene in epoxy oil caster based on FTIR spectra no seen in a way significant , because FTIR does not accurate used For analysis quantitative Because No common determine concentration compounds analyzed .​
A ntibacterial Activity of Blue Pea Flower (Clitoria ternatea) Acetone Extract Against Propionibacterium acnes and Citrobacter freundii Bacteria Tita Juwitaningsih; Hidayani
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70278

Abstract

This study aims to determine the antibacterial activity of acetone extract of blue pea flower (C. ternatea) against P. acne and C. freundii bacteria and to identify the secondary metabolites contained in acetone extract of blue pea flower (C. ternatea). Blue pea flower was extracted using the maceration method with acetone solvent. Preliminary antibacterial activity tests were conducted using the disk diffusion method. This was followed by the determination of the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values. Phytochemical screening tests were conducted using test tubes. The effectiveness of the acetone extract of butterfly pea flower showed antibacterial activity against P. acne bacteria with a value of 34% and against C. freundii bacteria with a value of 22.4%. The MIC and MBC values against P. acne and C. freundii bacteria were 1250 µg/mL and >5000 µg/mL, respectively. The phytochemical screening test results showed that the acetone extract of butterfly pea flower contained flavonoids, saponins, tannins, and steroids.
Development of Bio-battery from Pineapple Peel Waste (Ananas Comosus L. Merr) Using Table Salt (NaCl) as Ion Source and Tapioca Starch as Matrix Yoel Ezra Micael Ginting
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70411

Abstract

This research discusses the utilization of pineapple peel waste (Ananas comosus L. Merr) as a base material for environmentally friendly bio-batteries, adding table salt (NaCl) as an ion source and tapioca starch as a matrix. The study aimed to examine the potential of pineapple peel waste in producing renewable electrical energy and to analyze the effect of NaCl and tapioca addition on bio-battery performance. The process began with preparing pineapple peel waste (drying and smoothing), which was then mixed with varying concentrations of NaCl and tapioca. The results showed that the bio-battery produced voltage and current with performance varying by composition. The optimal concentration of NaCl combined with a balanced tapioca matrix provided the most stable voltage and longer durability. This finding indicates that pineapple peel waste is a potential solution for organic waste management and an alternative eco-friendly energy source.
Effect of Fermentation Time Variation on Electrical Energy Generation in Batteries Using Electrolyte Solutions from Orange (Citrus), Pineapple (Ananas comosus (L.) Merr), Watermelon (Citrullus lanatus), and Mixed Fruit Peels Adryansyah Anugrah Pratama
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70412

Abstract

This study aims to determine the effect of fermentation time variation of orange, pineapple, watermelon, and mixed fruit peels on electrical energy production in a battery system. The research was conducted experimentally using fermentation durations of 96, 120, and 144 hours. Based on the results and discussion, it was found that differences in fermentation time significantly influenced the electrical performance of the bio-battery for all types of fruit peel electrolytes tested. The variation in fermentation duration affected the electrochemical characteristics of the voltaic cell, where longer fermentation increased acidity and enhanced ion formation, resulting in higher pH reduction, current, voltage, and yield values. The best performance was obtained from the orange peel electrolyte fermented for 144 hours, producing a pH of 2.31, current of 18.88 A, voltage of 7.86 V, and yield of 85.24%. These results indicate that fermentation duration plays an important role in optimizing the electrochemical properties of natural electrolytes derived from fruit peels for sustainable energy applications.
The Effect of Edible Coating Made from Vanname Shrimp (Litopenaeus vannamei) Shells with the Addition of Cinnamon as an Edible Film for Fruit Preservation Ali Hamzah Lubis
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70413

Abstract

This study aimed to determine the effect of an edible coating made from vanname shrimp (Litopenaeus vannamei) shells with the addition of cinnamon (Cinnamomum sp.) extract as an edible film for fruit preservation. Shrimp shells, which are fishery by-products rich in chitin and chitosan, are utilized as the main material for making edible coatings because they are biodegradable, safe, and possess antimicrobial properties. The addition of cinnamon extract was expected to enhance the effectiveness of the edible film in inhibiting microbial growth and oxidation, while also improving the physical characteristics and shelf life of fruits. The study was conducted with various concentrations of cinnamon extract addition and was tested for parameters such as weight loss, color, firmness, and microbiological resistance of fruits during storage. The results showed that the application of the vanname shrimp shell–based edible coating with added cinnamon was able to slow down the deterioration of fruit quality, reduce weight loss, maintain color and firmness, and inhibit the growth of spoilage microorganisms. Therefore, the use of this edible coating has the potential to serve as a natural and environmentally friendly alternative for extending the shelf life of fruits.
The Effect of Liquid Organic Fertilizer from Gamal Leaves (Gliricidia sepium) on the Growth of Cayenne Pepper (Capsicum frutescens L.) as a Natural Substitute for Urea Andhika Febrian Pulungan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70414

Abstract

This study aims to determine the effect of liquid organic fertilizer (LOF) made from gamal leaves (Gliricidia sepium) on the growth of bird’s eye chili (Capsicum frutescens L.) as an alternative to natural urea fertilizer. The research is based on the high demand for fertilizers in chili cultivation and the negative impacts of excessive chemical fertilizer use on soil and the environment. Gamal leaves contain essential nutrients such as nitrogen (N), phosphorus (P), and potassium (K), which support plant growth. The experiment used various concentrations of gamal leaf LOF applied to chili plants, with observations on plant height, leaf number, and other morphological traits. Results showed that gamal leaf LOF positively affected plant growth, with certain concentrations performing better than the control. This indicates that gamal leaf LOF can serve as an eco-friendly and sustainable alternative to natural urea fertilizer.
Utilization of Watermelon Rind (Citrullus lanatus) for Bioethanol Production as Waste Treatment or Conversion of Waste into an Energy Source Dela Oktavianti
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70415

Abstract

Watermelon peel (Citrullus lanatus), which has so far been regarded as organic waste or garbage, has great potential to be utilized as a raw material for bioethanol production. The main contents of watermelon peel, namely carbohydrates—especially cellulose, hemicellulose, and simple sugars—allow fermentation processes to produce bioethanol as a renewable energy source. This study aims to explore the utilization of watermelon peel as a basic material for bioethanol through hydrolysis and fermentation stages using ethanol-producing microorganisms. By utilizing watermelon peel, it is expected to reduce organic waste problems while producing sustainable and environmentally friendly alternative energy. The research results show that watermelon peel can be fermented into bioethanol in significant amounts, making it a viable alternative energy source. Thus, the utilization of watermelon peel not only contributes to organic waste management but also supports the development of new renewable energy as a solution to the fossil energy crisis.
Production of Corncob (Zea mays L.) and Rice Husk (Oryza sativa) Briquettes Using the Pyrolysis Method as an Alternative Energy Source Giovani Mei Anggasta Telaumbanua
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70416

Abstract

This study aims to utilize agricultural waste in the form of corn cobs (Zea mays L.) and rice husks (Oryza sativa) as raw materials for briquette production through the pyrolysis method to generate environmentally friendly alternative energy. The background of this research is based on the high production of agricultural waste that has not been optimally utilized and the increasing energy demand that requires renewable energy sources. The research method includes several stages: drying the raw materials, performing pyrolysis to produce charcoal, grinding and mixing with a binder, and molding the mixture into briquettes. The observed parameters include moisture content, ash content, calorific value, and burning time of the briquettes. The results showed that the combination of corn cobs and rice husks produced briquettes with good quality, characterized by low moisture content, relatively high calorific value, and stable burning performance. These findings demonstrate that corn cobs and rice husks waste can be processed into briquettes as an alternative energy source with the potential to replace fossil fuels and support the concept of sustainable energy.
Utilization of Active Compounds in Plants as Botanical Pesticides for the Control of Mealybug (Pseudococcus lilacinus) Grandy Sihotang
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70417

Abstract

This study aims to evaluate the effectiveness of active compounds contained in several plant species as botanical pesticides to control mealybug pests (Pseudococcus lilacinus). Mealybugs are major agricultural pests that damage plants by sucking cell sap, leading to growth inhibition and yield loss. The excessive use of synthetic pesticides poses health and environmental risks and promotes pest resistance. Therefore, botanical alternatives are needed for safer and sustainable pest control. The research used plant extracts containing bioactive compounds such as alkaloids, flavonoids, saponins, tannins, and terpenoids, which act as contact poisons, antifeedants, and growth inhibitors. Laboratory tests were conducted to evaluate mortality rates of mealybugs under different extract concentrations. The results showed that certain plant extracts significantly increased mealybug mortality, indicating their potential as effective botanical pesticides. This finding supports the use of plant-based pesticides as an eco-friendly alternative to synthetic chemicals.
Utilization of Sweet Potato Leaf Extract (Ipomoea batatas L.) as a Bioflocculant in Clean Water Treatment Hotman Saragi Napitu
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.70418

Abstract

The increasing demand for clean water due to population growth and human activities is not matched by its availability, as many regions still face pollution from domestic and industrial waste. This study explores the potential of sweet potato leaf extract (Ipomoea batatas L.) as a natural bioflocculant in water treatment. Sweet potato leaves contain secondary metabolites such as flavonoids, saponins, and tannins, which contribute to coagulation–flocculation processes. The extract was applied to contaminated water samples and evaluated for its effectiveness in reducing turbidity, suspended solids, and other water quality parameters. The results show that the extract significantly improved water quality at optimal concentrations, outperforming the control. Moreover, it is environmentally friendly as it does not produce hazardous residues. Therefore, sweet potato leaf extract has potential as an economical, sustainable, and safe alternative bioflocculant for clean water treatment.

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