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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 18 Documents
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Search results for , issue "Vol 6, No 1 (2023): JANUARY 2023" : 18 Documents clear
Biodegradation Study of Polymer Composites Reinforced by Areca catechu fibers (Areca catechu L.) and Snake plant fibers (Sansevieria Trifasciata) Tasya Natalia Lumban Gaol; Nurfajriani Nurfajriani
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.v6i1.43180

Abstract

Natural fiber components are used for composite materials because they provide strength to the fibers. Composite materials commonly used are thermoset polymers, one of which is epoxy resin. Biodegradation aims to determine the rate of change in the mass of the specimen after 40 days of burial. The purpose of this study was to determine the effect of the volume fraction of the combination of areca catechu fibers and snake plant fibers on biodegradation properties. The method used in this research is the soil burial test, which is to determine the rate of polymer biodegradation in the soil. The best results in the biodegradation property test obtained the highest mass value of 30% variation obtained after burial for 40 days amounting to 13,417 grams, with the biodegradation test obtained a comparison before and after burial the mass value obtained did not experience a significant increase, this is because the composite material have no pores. or holes for the entry of microorganisms into the soil.
Effect of Flow Rate on Adsorption Cadmium Ion (II) Using Activated Carbon of Langsat Shell (Lansium Domesticum Corr) Farras Shafa Nabila; 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.v6i1.43175

Abstract

Cadmium 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 reduce the levels of heavy metal ions contained in wastewater. Langsat peel activated carbon is used as an adsorbent to adsorb cadmium metal because it is easy to obtain and its use is still minimal in the community. The langsat peel was made into activated carbon with HNO3 activator as a metal ion absorber Cd2+ using the column method. The activated carbon obtained has been tested for quality according to the Indonesian National Standard (SNI) No.06-3730-1995. In this study, we determined the effect of flow rate on metal cadmium absorption. The results showed that the activated carbon met the quality standards set by SNI and the optimum value of Cd2+ metal ion adsorption was at a flow rate of 1 ml/min.
Kinetics Degradation and Shelf Life of Curcumin from Turmeric (Curcuma domestica Val) with Ethanol Extract Coated by Maltodextrin at Room Temperature Storage Jaya Hardi; Ruslan Lina
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.v6i1.43186

Abstract

Curcumin extract from the turmeric plant is unstable to light, temperature and changes in pH, therefore it is necessary to be coated with biopolymers to have a longer shelf life. This study aims to determine the type of degradation kinetics of maltodextrin-coated curcumin and its shelf life at room temperature storage. Encapsulation was performed using an emulsion technique combined with freeze drying with the ratio of turmeric ethanol extract to maltodextrin of 7: 5 (w/w). The results showed that the efficiency of coating ethanol extract of turmeric with maltodextrin was 31.26%. Kinetics degradation of curcumin coated with maltodextrin follows zero-order reaction kinetics. Microcapsule of turmeric ethanol extract coated with maltodextrin has a shelf life at room temperature for 8.35 weeks.
Analysis of The Optical Properties of Ag Nanoparticles With The Assistance of Bioreductors of Saga Leaf Extract (Abrus pecatorius L.) Rahma Sofia Putri; Aldi Budi Riyanta; 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.v6i1.43179

Abstract

Nanotechnology has become an important and interesting field of physics, chemistry, biology and engineering in recent years. The rapidly growing nanotechnology today is nanoparticles. The characteristic characteristic of nanoparticles is that the particle size is very small in the range (1-100 nm). Silver nanoparticles have been synthesized using saga leaf extract (Abrus pecatorius L.) as a reducing agent. The formation of silver nanoparticles was carried out by adding sage leaf extract to the AgNO3 solution and homogenizing using a magnetic stirrer for 60 minutes. UV-Vis spectrophotometer was used to confirm the formation of silver nanoparticles. Test the inhibition of bacteria using the well method. The results showed that the wavelength values were in the range of 375-395nm.
Kinetics Degradation and Shelf Life of Curcumin from Turmeric (Curcuma domestica Val) with Ethanol Extract Coated by Maltodextrin at Room Temperature Storage Jaya Hardi; Ruslan Lina
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.v6i1.43448

Abstract

Curcumin extract from the turmeric plant is unstable to light, temperature, and changes in pH, therefore it is necessary to be coated with biopolymers to have a longer shelf life. This study aims to determine the type of degradation kinetics of maltodextrin-coated curcumin and its shelf life at room temperature storage. Encapsulation was performed using an emulsion technique combined with freeze drying with a ratio of turmeric ethanol extract to maltodextrin of 7: 5 (w/w). The results showed that the efficiency of coating the ethanol extract of turmeric with maltodextrin was 31.26%. Kinetics degradation of curcumin coated with maltodextrin follows zero-order reaction kinetics. The microcapsule of turmeric ethanol extract coated with maltodextrin has a shelf life at room temperature of 8.35 weeks.
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.v6i1.43449

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.
Effect of Adsorbent Dosage on Copper Ion Adsorption Using Activated Carbon of Langsat Shell (Lansium domesticum Corr) with Column Method M Yogi Yunanda; 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.v6i1.43447

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.
Antibacterial Activity of Endophyte Fungus from Sambiloto Flowers (Andrographis paniculata) on Black Rice Growing Media Rizka Purwanti; Iryani Iryani; Riga Riga; Mariam Ulfah
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.v6i1.43450

Abstract

Sambiloto plant (A. paniculata) is widely reported to have secondary metabolites that act as antibacterial. The potential is not only derived from the natural A. paniculata plant but can also be explored from its endophytic fungus. This study aimed to determine the antibacterial activity of ethyl acetate extract of endophytic fungus BS isolated from bitter flower (A. paniculata) on black rice growing media against Staphylococcus aureus, Streptococcus mutans, and Pseudomonas aeruginosa bacteria. The antibacterial activity test of the extract was carried out by disc diffusion method. The results obtained showed that the ethyl acetate extract of BS endophytic fungus grown on black rice media showed activity to inhibit the growth of Staphylococcus aureus, Streptococcus mutans, and Pseudomonas aeruginosa bacteria at concentrations of 10%, 30%, and 50%. In conclusion, the ethyl acetate extract of the endophytic mushroom BS isolated from the bitter flower (A. paniculata) can be used as an antibacterial.

Page 2 of 2 | Total Record : 18

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