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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 229 Documents
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Making Nitrogen Fertilizer using Cassava Leaves and Papaya Leaves on Chili Plants Ella Oktaviana Siahaan; Kristin Wulan Liberti Vivanis Gulo; Ribka Darningsih; Sarah Sihotang
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33138

Abstract

Nitrogen is one of the macro nutrients to increase plant growth and production. Yogurt is a processed product which is a fermented milk product that has long been known and has a specific sour taste. Yogurt contains streptococcus thermophilus and lactobacillus bulgaricus bacteria that live in symbiosis. Sweet potato leaves Its nutritional value can be increased through fermentation because fermentation can increase protein digestibility, reduce crude fiber content, improve the taste and aroma of feed ingredients and reduce heavy metal levels. Sweet potato leaves contain crude fiber of 25.71%, 69.50% moisture content. Nitrogen 13.41% .. This research was conducted for 3 weeks. 2 weeks in the fermentation process of nitrogen fertilizer solution and 1 week of giving it to plants. The results showed that the stem height, leaf color of the chilies changed after giving nitrogen fertilizer.
Synthesis and Characterization of α-Cellulose from Young Coconut Coir (Cocos nucifera L.) Gracella Evangeline Sarumaha; Zainuddin Muchtar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33143

Abstract

Young coconut (Cocos nucifera L.) is a plant with a high cellulose content of 28%. Because of its high cellulose content, young coconut coir fiber has the potential to be synthesized into α-cellulose. The purpose of this research was to use FT-IR to characterize young coconut coir α-cellulose. This research method was use isolation of α-cellulose method (delignification, swelling, and bleaching). 75 grams of young coconut coir can produce 12,1015 grams of α-cellulose. Young coconut coir α-cellulose has a spectrum that is similar to commercial α-cellulose, according to the results of functional group analysis using FT-IR.
Study of Energy and Structure on Interactions Between Molecules In Solvents - Organic Solves Using Computational Chemical Methods Nur Aisah Malau; Asep Wahyu Nugraha
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33139

Abstract

This study aims to determine the amount of energy, the difference in energy, the relationship between the amount of energy and the distance between compounds, and the interactions that occur in organic solvent molecules using computational chemistry methods. In determining the amount of energy and interactions that occur, computational chemistry calculations are used using NWChem software version 6.6 with the DFT method with the B3LYP hybrid function/basis set 6-31G, the calculation results are visualized using Jmol software. The results of calculations with large computations of energy for benzene are -230.62447487 KJ/mol, ethanol -154.01322923 KJ/mol, methanol -114.98816558 KJ/mol, hexane are -235.27001385 KJ/mol. Mixture of benzene and ethanol in a ratio of 1 : 1 -384.63823964 KJ/mol, 1 : 2 538.66009762 KJ/mol , and 2 : 1 -615.26607558 KJ/mol. A mixture of benzene and methanol in a ratio of 1 : 1 -345.61255299 KJ/mol, 1 : 2 -460.60826254 KJ/mol, and 2 : 1 -576.24044425 KJ/mol, a mixture of hexane and ethanol in a ratio of 1 : 1 -389.28477268 KJ/mol, 1 : 2 -543.29869234 KJ/mol and 2 : 1 -624.55723290 KJ/mol. A mixture of hexane and methanol at a ratio of 1 : 1  -350.25984691 KJ/mol, 1 : 2 -465.26041654 KJ/mol and 2 : 1 -585.53373886 KJ/mole. The difference in energy is the most in a mixture of benzene and ethanol in a ratio of 1 : 2 -0.00916429 K /mol, in a mixture of benzene and methanol in a ratio of 1 : 2 - 0.00745651 KJ/mol, a mixture of hexane and ethanol in a ratio of 2 : 1 -0.00397597 KJ/mol, and a mixture of hexane and methanol in a ratio of 1 : 2 -0.01407153 KJ/mol. and there is no relationship between the magnitude of the interaction energy of the mixture with the distance between the molecules.
The Study of pH and Ionic Strength on Ni(II) and Pb(II) sorption using Humic Acid-Urea Formaldehyde (AHUF) Meidita Kemala Sari; Bambang Rusdiarso
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33144

Abstract

The study of pH and ionic strength on Pb(II) and Ni(II) sorption with AHUF adsorbent has been investigated. The AHUF was synthesized from humic acid (AH) with urea-formaldehyde (UF) and characterization by FTIR, SEM-EDX, total acidity content, and pH zero point charge (pHpzc). The study of pH and ionic strength using the batch system. The formation of AHUF was identified based on; decreases in total acidity (349.30 cmol/kg), emerging peaks at 3351, 1258, and 1049 cm-1 by FTIR, and increases of N atoms 21.06% by EDX. The results indicate the adsorption of Pb(II) and Ni(II) are strongly dependent on pH and ionic strength at pH < 6. The AHUF have a pHpzc value is 4.82 with optimum sorption on pH 5. The variations of NaCl to adsorption Pb(II) and Ni(II) caused a decrease in the value of ionic activity from 0.999 M – 0.309 M, the amount of adsorbed will decreased.
Caffeine Levels from Various Types of Coffee Drink Packaging Circulated in the Medan City Market Were Examined Using a UV Spectrophotometry Method Gabena Indrayani Dalimunthe; Adli Nuzula Rahmah; Zulmai Rani; Yayuk Putri Rahayu
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.37465

Abstract

Coffee drinks are drinks that come from the processing and extraction of coffee beans. One of which is caffeine. Coffee contains approximately 24 of the most important substances. The purpose of this study was to determine the level of caffeine in coffee drinks from various types of packaging. The research stages include sample collection and preparation; identification of caffeine content; and examination of caffeine levels using UV spectrophotometry. The results showed that the three samples of coffee drinks sold at the minimarket in Jermal, Medan contained caffeine, and the levels of caffeine in coffee drinks were 26,352±0,292 mg/100mL (Sample A), 15,179±0,286 mg/100mL (Sample B), and 7,965±0,98 mg/100mL (Sample C). The caffeine content obtained meets the requirements of SNI, where the maximum amount of caffeine that can be consumed by the public in a day based on SNI is 50 mg–150 mg.
Removal of Heavy Metal Copper (Cu) Ions from Wastewaters Using Various Bio-adsorbents Khairunnisa Khairunnisa; Siti Rahmah; Rini Selly; Jasmidi Jasmidi; Hafni Indriati Nasution; Moondra Zubir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.37447

Abstract

Biosorbent derived from agricultural waste as one of the widely used adsorbents has many applications in the environment to remove pollutants, one of which is heavy metal copper (Cu). In this paper, natural sources of agricultural waste materials have been reviewed and have potential as biosorbents for the absorption of heavy metal copper (Cu). The characteristics of the biosorbent that can be used for the absorption of heavy metal copper (Cu) depend on the surface area and pore structure made by the modified method. The biosorbent modification method depends on the precursor and the expected biosorbent characteristics. Natural biosorbents can be converted into modified biosorbents by chemical, physical, or physico-chemical modifications. Therefore, this paper aims to provide information about the absorption of adsorbents from agricultural wastes that have been reported for the absorption of heavy metal copper (Cu) in wastewater
Toxicity Test of Windu Shrimp (Penaeus monodon) Skin Chitosan With Brine Shrimp Lethality Test Method Dina Suciati Saragih; Ridwanto Ridwanto; Anny Sartika Daulay; Dikki Miswanda; Haris Munandar Nasution
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.37453

Abstract

Chitosan is a modification of chitin compounds that are widely found in the outer skin of crustacean animals such as shrimp and crabs. This research includes isolation of chitin and chitosan: deproteination, demineralization, depigmentation and deacetylation namely transformation of chitin into chitosan, characterization of chitosan, FTIR, and chitosan toxicity test with five concentrations of test solution, namely 100 g/ml, 250 g/ml, 500 g/ml, 750 g/ml and 1000 g/ml using the BSLT method by looking at the number of deaths of Artemia salina L larvae (LC50). The results of tiger prawn shell chitosan (Penaeus monodon) obtained the % degree of deacetylation of 60%. The results of the toxicity test showed that chitosan was not toxic to Artemia salina Leach, indicated by the LC50 value > 1000µg/ml. chitosan windu 4994.16 g/ml, chitosan is not toxic
Formulation of Facial Wash from Nettle Leaf (Urtica Dioica L.) Ethanol Extract Mutiara Agustina Nasution; Zuhairiah Nasution; Fitria Mahdani
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.40919

Abstract

Face wash is a facial cleanser in the form of a gel containing foam which is recommended for sensitive, oily and acne prone skin. One of the natural ingredients that can be developed is nettle (Urtica dioica L.). The aim of this study was to to determine the potential of nettle leaf extract facial wash. The process of making nettle leaf extract using the maceration method with ethanol as a solvent. The results of the characteristics of nettle leaf simplicia powder obtained 13.78% water content, 37.7% water soluble extract content, 37.89% ethanol soluble extract content, 14.69% total ash content. The screening of simplicia powder results were positive for containing alkaloids, flavonoids, terpenoids, steroids, saponins, tannins. From the research that has been done, it can be concluded that ethanol extract of nettle leaves can be formulated in a facial wash with a variation of concentration of 5%, 10% and 15%.
Bioethanol Levels from Corn Cob Waste: Effect of Fermentation Time and Saccharomyces cerevisiae Yeast Amount (Zea mays) Veronika Meiyuina Simatupang; Ramlan Silaban
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.37448

Abstract

This study aims to determine the highest levels of bioethanol produced through the fermentation process, by looking at the effect of variations in the amount of Saccharomyces cerevisiae, immobilization, and fermentation time, as well as the effect of the amount of Saccharomyces cerevisiae and fermentation time on the ethanol content produced. The highest ethanol content was 39.5 percent in the bioethanol test, with the amount of Saccharomyces cerevisiae 8 grams and fermentation time of 9 days. The treatment given to the number of immobilized Saccharomyces cerevisiae cells and the length of time of fermentation had a major effect on the ethanol content produced, as shown by Anova.
Effect of Giving of Ethanol extract of Ginger (Zingiber officinale Rosc.), Pandan leaves (Pandanus amarylifolius Roxb), Citronella (Cymbopogon nardus (L.) Randle), Cinnamon (Cinnamomum burmanii B.) on Cholesterol Reduction in Male Strain Rats (Rattus Norvegicus) ElySabet Pratiwi Siagian; Rumondang Fransiska Tampubolon; Ida Duma Riris
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 2 (2022): JULI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i2.37454

Abstract

Cholesterol in the blood is a form of sterol derived from a lipid molecule that serves as the main structural component of plasma membrane. Atherosclerosis is a change characterized by thickening of the arterial walls due to the accumulation of cholesterol in the intima of blood vessels. By using SPSS analysis, it was found that the Shapiro-Wilk Normality Test with a sig value > 0.05, the data were normally distributed. The results of the analysis in the Test of Homogeneity of Variences table obtained a Sig Value 0.106. This the value of Sig = 0.106 > 0.05, them ho is accept. Thus the ethanol extract of ginger, pandan leaves, citronella, cinnamon, has the potential to reduce cholesterol levels. By using four different doses, the rat group at a dose 100mg/kgbw showed cholesterol levels of 90,75(mg/dl) ± 11,58, the rat group at a dose 200mg/kgbw showed cholesterol levels of 95,5(mg/dl) ± 6,80, the rat group at a dose 300mg/kgbw showed cholesterol levels of 75,75 (mg/dl)± 2,06, the rat group at a dose 400mg/kgbw showed cholesterol levels of 67,5mg/dl ± 2,64.

Page 8 of 23 | Total Record : 229

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