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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 237 Documents
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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.
Characterization of Molecularly Imprinted Polymers (MIPs) as Cholesterol-Absorbing Materials Nadia, Nadia; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49367

Abstract

Molecularly Imprinted Polymer (MIP) membranes as cholesterol absorbers have been successfully synthesized. MIP membranes can absorb cholesterol molecules because they have cavite (pores) and active groups that are selective and sensitive to cholesterol molecules. MIP membranes are synthesized from butyl acrylate monomers, cross-linkers, ethylene glycol dimethacrilate (EGDMA), initiators of 2- 2-dimethoxy-2-phenylacetophenone (DMPP, sodium dodecyl sulfate (SDS) as surfactants, and cholesterol as templates. MIP membranes are synthesized using photopolymerization irradiated with UV light. The results obtained in the form of powder solids can be characterized using UV-Vis spectrophotometry. The results obtained by UV-Vis spectrophotometry showed that the MIP membrane prepared a standard curve with a linear regression equation y = 0.0054x-0.007 with a value of R2 = 0.9982. This suggests that MIP membranes are selective and sensitive to analytes. At optimum absorption of the MIP-cholesterol membrane can absorb cholesterol molecules in the amount of 0.020 grams of cholesterol composition within 20 minutes
The Jasmine Plant Growth Effect Supplemented with Liquid Organic Fertilizer from Banana Peels Selly, Rini; Panjaitan, Angel Shylvia; Br. Gurusinga,, Dinda Natalisa; Khairunissa, Dira; Manalu, Santa Maria; Rahmah, Siti
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49362

Abstract

Liquid organic fertilizer (LOF) is a solution resulting from the decomposition of organic matter originating from plant residues, agro-industrial waste, animal waste, and human waste containing more than one nutrient. LOF can be made from liquid organic matter (liquid organic waste), by composting and providing composting activators so that a LOF that is stable and contains complete nutrients can be produced. The use of LOF has the advantage that although it is often used it does not damage the soil and plants, the use of organic waste as fertilizer can help improve soil structure and quality, because it contains nutrients and other organic matter. The process of adding different fertilizers to the plants for 10 days showed that there were different height changes for each plant. With only water, the plants only reach 0.1 cm difference in 7 days. The plants that were given LOF and NPK (Chemical Fertilizer) gained height in only 4 days with heights 15.6 cm and 16 cm respectively. The growth percentage between LOF and NPK showed a significant difference in 4 days with 0.6% and 3.2 % respectively.
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49368

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Antioxidant Activity Test of Barangan Banana Peel (Musa Acuminata Linn) Etanol Extract With DPPH Method Arista, Nurul; Siregar, Rudi Munzirwan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49373

Abstract

Barangan banana (Musa acuminata linn) is also called Medan banana which is often found in North Sumatra. Banana peels are known to contain phenolic compounds that have potential as antioxidants. This study aims to determine the antioxidant activity of raw and ripe banana peel extract of Barangan banana (Musa acuminata linn) using the DPPH (1,1-diphenyl-2-pikrihidrazil) method. The data obtained was calculated to determine the antioxidant activity. The results showed that the antioxidant activity of the ethanol extract of Barangan raw banana peel IC50 = 32,52 μg/mL, the ethanol extract of Barangan ripe banana peel IC50 = 83,60 μg/mL, and the vitamin C comparator obtained an IC50 value of 5,00. Raw banana peel extract has higher antioxidant activity than ripe banana peel extract.
Comparison between Transesterification Reaction with Microwave Heating and Conventional Heating for Biodiesel Production from Coconut Oil with Alkaline Catalyst Boangmanalu, Srunika; Ginting, Elfrida
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49364

Abstract

Biodiesel is a biofuel made from vegetable oil through an esterification-transesterification process. The process of making biodiesel is carried out by conventional heating methods and microwave heating. The reaction process was carried out according to the specified variables, with a concentration of 0.1% of the volume of methanol and a variable microwave power of 135, 225 and 315 watts with time variations of 5, 3 and 1 minute, as well as conventional heating at 60°C for 1 hour. The best result is the one using microwave heating with a power of 315 watts for 1 minute. The best biodiesel yield is 88.879%, with water content of 0.01%, an acid number of 0.56 Kg-KOH/g, a density of 0.892 g/mL and a viscosity of 2.617 cSt. The best result of biodiesel oil in comparison of is using the microwave heating method.
Synthesis of Sodium Myristyl Sulfate with Myristyl Alcohol Sulfation using SO3-DMF Sitinjak, Elvri Melliaty; Masmur, Indra; Tarigan, Dedi; Anggini, Cindy; Simbolon, Emma Juli Anamasta; Simatupang, Endang; Pane, Yulia Ratu; Simorangkir, Murniaty; Nurfajriani, Nurfajriani
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49378

Abstract

The sulfation reaction between myristyl alcohol and the SO3-DMF complex has been successfully carried out to produce sodium myristyl sulfate. Formation of the SO3-DMF complex by reacting DMF and SO3 gas obtained from the reaction of phosphorus pentaoxide and H2SO4. The variables studied were the time of formation of the complex, the time and temperature of sulfation and the concentration of NaOH at neutralization. The results of myristyl alcohol sulfation with SO3-DMF were tested by FTIR spectroscopic analysis, surface tension test, and foam stability test. The formation time of the SO3- DMF complex of 5 hours is the result of the highest surface tension reduction and the most optimal foam stability. The results of the foam stability test analysis showed the highest value at 80oC with a foam stability of 0.5 cm. The best result of sulfation neutralized with 40% NaOH solution was able to reduce the surface tension value and has foam stability up to 66% with a decrease in foam height of 0.3 cm
Effect of Different Retanning Agents on Shrinkage Temperature of Leathers Zehra, Beena; Nadeem, Uzma; Ismail, Sarwat; Solangi, Barkat Ali; Pervez, Mohammad Kashif
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49365

Abstract

Retanning of tanned leathers played an important role to raise the shrinkage temperature characteristic and quantum of retanning agents, where crosslinks are formed with the polypeptide chain of the collagen or other reactive available sites of the collagen. This study is useful for the tanners to determine the percentage of shrinkage by using different retannages. The results revealed that the maximum thermal stability (increase in shrinkage temperature 21-25%) has been found in the basic chromium sulphate retanned leather without destruction of physical properties. Beside this, other types of retannages i-e, mineral retanning, phenolic based retanning, formalin based syntan have been showed thermal stability upto different levels (increase in shrinkage temperature 4-6%,12-15%, 10- 14% respectively) in addition to the development of physical properties such as tensile strength (N/ mm2 ), tear strength (N/mm), fullness , etc. to suit different needs.

Page 11 of 24 | Total Record : 237

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