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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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Modification Of Natural Rubber Sir-20 With Cyclisation and Grafting Methods with Maleic Anhydride Eddiyanto Eddiyanto; Andreas Nababan; April Sinaga
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.v5i2.37450

Abstract

Modification  has been carried out through a cyclization process using an organic solvent of Xylene in the various of concentration of P2O5 as a  Lewis Acid catalyst followed by the grafting process of Maleic Anhydride (MA) monomer using dicumyl peroxide (DCP) as the initiator. The success of the cyclization process of CNR formation can be seen from the FTIR analysis which shows typical peaks at the absorption wave of 741 cm-1 from the CH2 – CH2 cyclical strain vibration and a wavelength of 835 cm-1 from the non-cyclical strain vibration CH2 – CH2 indicating that cyclization has occurred. Furthermore, on the results of grafting, FTIR analysis was carried out to prove that the MA had been grafted on the Cyclic Natural rubber (CNR) so that the formation of CNR-g-MA as shown of the C=O wave number which was on wave number 1710 cm-1 and 1850 cm-1.  
Bioethanol Manufacturing from α-Cellulose Waste of Empty Palm Oil Frugs (Elaeis guineensis jack) with Hydrolysis Concetration Variations HCl and Cellulase Enzyme Indra Masmur; Herliana Herliana; Bramwell Sitompul; Elvri Melliaty Sitinjak
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.v5i2.37455

Abstract

This study uses raw materials containing lignocellulose, namely empty fruit bunches of oil palm. Oil palm empty fruit bunches were isolated to produce cellulose, hydrolyzed into simple sugars, fermented, and distilled. From the isolation of cellulose obtained α-cellulose of 19.9612 grams (26.6149%). Then it was hydrolyzed using HCl with a concentration variation of 15%; 20%; 25%; 30%; and enzymatically hydrolyzed using cellulase to produce simple sugars which were tested qualitatively with Benedict's reagent and Tollens reagent, then quantitatively tested by the Luff Schroll method. The higher the concentration of acid used, the higher the sugar will be. The best bioethanol obtained from acid hydrolysis is using 30% HCl with ethanol content of 6.54% and enzymatic 7.32%.
Modified Natural Rubber Sir-20 Using Chain Scission Reaction Method And Grafting With Anhydrous Maleic April Sinaga; Eddyanto Eddyanto; Andreas Nababan
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.v5i2.37451

Abstract

In this research, natural rubber SIR-20 was modified by the chain severing reaction method with the addition of decimal peroxide and flowing oxygen gas as much as 2 l/mint for 6 hours at a temperature of 135oC while stirring. Fourier Transformed-Infra Red (FTIR) spectra obtained, it can be concluded that there has been a chain breaking reaction seen from the functional group analysis which produces a series of distinctive peaks in the hydroxyl group (OH) and 2 carbonyl peaks (C=O) which are obtained at natural rubber SIR-20 + 3 phr DCP of 3435 and 1715, respectively; 1737 and has a strong intensity which indicates a chain breaking reaction has occurred in natural rubber SIR-20. From the results of the FTIR analysis, it was found that the C=O group was getting sharper which was the typical absorption peak originating from maleic anhydride grafted on the natural rubber chain.
Ethanol Production Comparison from Agricultural Waste of Cellulose Source Within Hydrolysis Hcl and Cellulose Enzyme Indra Masmur; Clairine Clairine; Mega Evelin Rajagukguk; Teti Purwita Sari; Elvri Melliaty Sitinjak
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.v5i2.37456

Abstract

The production of Ethanol has been utilized through the process of cellulose isolation from agricultural waste such as corn husk, rice straw and rice husk. Isolation of cellulose with pretreatment delignification using, NaOH 2% to produces cellulose of corn husk 16,6921 g (22,25%), rice straw 16,9021 g (22,53%) and rice husk 16,3691 g (21,85%) then analyzed the functional groups using FT-IR and SEM analysis. Cellulose as much as 2 g is hydrolyzed using HCl 30% and cellulase enzymes to obtain sugar that is qualitatively tested with Benedict and Tollens reagent and quantitatively tested with Luff Schoorl method and produces highest sugar content of rice husk 8,64% and 10,95%. The next stage sugar of hydrolysis will be fermented using  yeast (Saccharomyces cerevisiae) with 6 days, and then distilled at a temperature of 78-80oC. Ethanol was calculated by the potassium dichromate oxidation method to gave highest result from agricultral waste of ethanol chemical 5,97% and enzymatic 6,89% is rice husk.
Cytotoxicity Test of Cocoa Leaf Ethanol Extract (Theobroma Cacao L.) With Brine Shrimp Lethality Test (BSLT) Method Zulmai Rani; Ridwanto Ridwanto; Dikki Miswanda; Rafita Yuniarti; Ani Sutiani; Ricky Andi Syahputra; Reza Irma
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.v5i2.37452

Abstract

Cancer is a disease characterized by uncontrolled cell division and the ability of these cells to invade other biological tissues, either by direct growth in adjacent tissues or by migration of cells to distant sites. The purpose of this study was to determine the class of secondary metabolites contained in the ethanol extract of cocoa leaves and their cytotoxicity by looking at the LC50 value using the Brine Shrimp Lethality Test (BSLT) method. This research includes phytochemical screening of ethanol extract and the BSLT method by looking at the number of deaths of Artemia salina leach larvae (LC50). The results of phytochemical screening tests showed that the cocoa leaves contained flavonoids, alkaloids, tannins, saponins, steroids, and glycosides. The cytotoxicity test with probit analysis showed an LC50 value of 269,15 µg/mL, so it was concluded that the ethanol extract of cocoa leaves was toxic and had potential as an anticancer.
Effect of Adsorbent Dosage on Copper Ion Adsorption Using Activated Carbon of Langsat Shell (Lansium domesticum Corr) with Column Method Muhammad Yogi Yunanada; Desy Kurniawati
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 1 (2023): JANUARY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i1.43173

Abstract

Copper is one of the dangerous heavy metals contained in industrial wastewater, whose presence needs to be addressed. Adsorption is one method that can be used to adsorb heavy metals. Using a langsat shell as an adsorbent is used to adsorb copper because it is easy to obtain and its use is still minimal in people. Using the column method, the langsat shell was made into activated carbon with HNO3 as an adsorber of Cu2+ metal ions. The activated carbon obtained was tested for quality according to Standard Nasional Indonesia (SNI) No.06-3730-1995. In this research, we determine the effect of adsorbent dosage on the adsorption of copper ions. The results showed the activated carbon meets established quality standards of SNI and the optimum adsorption value of Cu2+ metal ions at an adsorbent dosage of 0.4 grams.
Electrical Analysis of Fermented Durian Rinds Siti Rahmah; A Masrukhan Nur; Andreta B Hutahuruk; Kurnia Rizki Siregar; Nelsy Theresia Siggalingging; Rini Selly
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 1 (2023): JANUARY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i1.43188

Abstract

In this study, Durian rind wastes were fermented using Saccharomyces cerevisiae yeast to break the starch to be smaller sugar molecule. Then, the pH was analyzed using digital pH-meter. The voltage and electric current were analyzed using multimeter. The result showed that the lower the pH value the greater its voltage and its electric current. The pH value influenced by fermentation time. The longer the fermentation time the lower the pH value. The type of microorganism and the composition of durian rind wastes were also affected the pH value. In this study, the fermentation process was set for 24, 48, 72 hours, and the pH value was resulted in the basic range. The highest voltage is 0.094 volt and the highest electric current is 0.058 mA measured in pH 12.3.
Adsorption of Lead Ion (II) Using Activated Carbon of Langsat Shell (Lansium domesticum Corr) with Column Method Muhammad Taufiq; Desy Kurniawati
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 1 (2023): JANUARY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i1.43178

Abstract

Lead (II) ion is one of the dangerous metal ions produced from various industrial wastes and its existence needs to be addressed. Adsorption using langsat peel activated carbon was proven to be able to absorb lead (II) ions. The stages of absorption are carried out by varying the adsorbent weight (0.2, 0.3, 0.4, and 0.5) g, and flow rate (1,2,3,4) mL/minute by column method then continued with testing using atomic absorption spectrophotometer (AAS). The results showed that the optimum conditions occurred at the weight of the adsorbent is 0.2 g, and the flow rate is 2 mL/min.
Determination Of Total Flavonoid Content Of Bajakah Tampala And Kalalawit Roots Using The Reflux Sasi Yuni Kirana; Rizki Febrianti; Wilda Amananti
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 1 (2023): JANUARY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i1.43183

Abstract

Bajakah is one of the plants found in the forest around Muara Badak. Bajakah root contains flavonoids which have potential as natural ingredients that have medicinal properties. Currently, there are two types of bajakah root on the market, namely tampala and kalalawit. This study aims to determine the content and total flavonoid content of the extract of the Bajakah root from the two types of Bajakah root. The research procedure was initiated by the process of extracting the roots of the Bajakah root using the reflux method using 96% ethanol. The reflux extraction results are then carried out by an evaporation process to obtain a thick extract. The second step is to test the flavone content through a color test. And the quantitative test for determining total flavonoid levels was carried out by UV-Vis Spectrophotometry. Based on the results of a qualitative test using a color reaction, it shows that the roots of the kalalawit and tampala bajakar contain flavonoids. Where the total flavonoid content in the roots of Bajakah Tampala was 59.38% and in Bajakah Kalalawi roots was 47.14%.
Bibliometric Analysis on Scholarly Journals of PVA Hydrogel Membrane Using VOSviewers Software Virni Grace Irene Damanik; Asep Bayu Dani Nandiyanto
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 1 (2023): JANUARY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i1.43182

Abstract

The development of technology in this world is already developing rapidly. One of the advanced technologies that support research planning is bibliometrics. This study aims to analyze the scope of research on PVA Hydrogel Membrane using VOSviewer using bibliometric review with a mapping process to ensure that the research to be carried out has never been studied and knows the relationship of each related item. The three processes underlying the search use the keywords "chemistry, particle, PVA, and Hydrogel" namely title, abstract, and keyword. The research database is taken from google scholar. A total of 98 articles are relevant and meet the criteria. The results show that most of the studies were conducted in the 2012-2022 range. PVA and Hydrogel are so closely related to each other that they have a fairly bright density visualization. Some items are not related to the PVA Hydrogel Membrane but these items are interconnected with other items so it can be concluded that there are still many items that can be used for further research.

Page 9 of 23 | Total Record : 229

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