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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 179 Documents
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ACTIVATION OF SINABUNG MOUNT VOLCANIC ASH USING VARIOUS MINERAL ACIDS Shohihatun Bariyah; Lisnawaty Simatupang
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 4, No 1 (2021): JANUARY 2021
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v4i1.23087

Abstract

The effect of various types of mineral acids in activating the silica of volcanic ash of Mount Sinabung has been carried out. The use of various types of mineral acids is aimed at reducing impurities in the form of metals contained in the ash so that it can increase the SiO2 content in the ash. In the treatment, volcanic ash is prepared beforehand by grinding and sieving with a 200 mesh sieve. The sieved ash was then added with mineral acids, namely HCl, HNO3 and concentrated H2SO4 and heated at 100oC for 2 hours. After that, it was neutralized with distilled water and in an oven at 120oC for 6 hours and characterized using XRF to determine the impurities that had been lost. Based on the results obtained using XRF characteristics, the SiO2 content of volcanic ash activated with HCl was 80,23%, HNO3 was 77,23% and H2SO4 was 76,89%. This shows that activation using HCl is more optimal than using HNO3 and H2SO4.
Utilization of Glycerol from Used Oil as an Ester Glycerol Surfactant Dian Wardana; Ahmad Ramadhan; Dinda Prihatini Fitri Amne; Eddiyanto Eddiyanto
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13999

Abstract

The development of biodiesel which is currently increasing has helped increase glycerol as a by-product. The glycerol can be obtained from a transesterification reaction in either vegetable or animal oils or fats and even used cooking oil. Glycerol buildup without further processing can reduce the selling price of glycerol. One solution to overcome this is to convert it to surfactants such as glycerol esters which are widely used in various industries such as chemistry, food, cosmetics, medicine and textiles. This study aims to utilize used cooking oil as a source of glycerol used in the synthesis of glycerol ester surfactants, as well as to compare the quality of glycerol ester surfactants produced by the use of commercial glycerol. The process begins by isolating glycerol from used cooking oil and then purifying it to improve its quality. Then glycerol ester was synthesized by using stearic acid, palmitic acid and oleic acid at reaction times of 120, 150 and 180 minutes. The highest yield of ester glycerol produced was at the reaction time of 180 minutes for each use of fatty acids. The test results showed that the glycerol ester produced was able to reduce the surface tension of the water. The value of hydrophylic-lipophylic balance (HLB) is not much different in the range of 5, and the use of various fatty acids and different sources of glycerol results in % of the stability of different emulsions.
Study of Phytochemicals, Toxicity, Antibacterial Activity of Ethyl Acetate Leaf Extract Extract (Paperomiapellucida L) Ida Duma Riris; Tita Juwitaningsih; Destria Roza; Marini Damanik; Albinus Silalahi
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 3, No 2 (2020): July 2020
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v3i2.19532

Abstract

Suruhan Leaf (Paperomiapellucida L) is a weedy plant that is used by rural communities as herbal medicine. In this study, phytochemical tests have identified compounds contained in the ethyl acetate extract, then the toxicity test was carried out by the Brint Shrimp LethallytyTocycity (BSLT) method using Artemia Salina Leach shrimp larvae, an antibacterial activity test for bacteria: Bacillus cereus (ATCC) 11778), S. aureus (ATCC 25923), E. coli (ATCC 25922), S. saprophytic (ATCC 49907), Catsobacterfrendi (ATCC 18090), P.acne (ATCC 27853), Epidermis (ATCC 12228) with diffusion methods, various of concentration 1; 5; 10; 25% as control used chloramphenicol 30 mcg, the highest inhibitory zone at a concentration of 25% showed a strong antibacterial succession of 20.7; 11.1; 29.7; 15; 13.5; 10; 17.3 mm. The results of the identification of compounds in ethyl acetate extract are alkaloids, flavonoids, steroids, saponins, and tannins. The toxicity of LC50 is 71.28 ppm (toxic).
Antimicrobial Activities of Bioactive Compounds from Jatropha curcas Zona Octarya; Fitri Refelita; Novia Rahim
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 1 (2019): January 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i1.12366

Abstract

Jatropha curcas L is widely planted in people's homes. Jatropha has many bioactive compounds, including flavonoids, saponins, tannins, and alkaloids. In this research, phytochemical tests and antimicrobial activities of sap and water extraction of Jatropha curcas L leaves on Candida albicans, Aspergillus, and Pseudomonas aeruginosa were carried out. The results of the phytochemical test of sap and water extraction of leaves showed positive results in the test of flavonoids, saponins, alkaloids and tannins. While steroid testing showed negative results. The antimicrobial capabilities of sap and water extraction of leaves to Aspergillus were 10.5 mm and 11 mm and to Pseudomonas Aeruginosa were 15 mm and 11 mm. Whereas the antimicrobial ability of sap and water extraction of leaf to Candida albicans was negative. In this case, it means that Pseudomonas aeruginosa is including microbes that are sensitive to antimicrobial origin of plants.
Analysis of Fosfor Hara Elements in Coconut Leaves Oil By Spectrofotometry Rudi Munzirwan Siregar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 3, No 1 (2020): January 2020
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v3i1.18547

Abstract

As Have been conducted by analysis element of hara phosphorus at palm leaf in indonesia oil palm research institute at medan. Determination of phosphorus rate in palm leaf conducted with methode of spektrofotometri uv-visible. Result of analysis indicate that phosphorus rate the obtained is 0,16% in palm leaf. Of this result indicate that phosphorus rate in palm leaf still less, answer the demand of standard which have been determined by that is between 0,17 - 0,19%.
Metal Organic Frameworks of CPL-4 and CPL-5 Synthesis and Characterization under Magnetic Fields Moondra Zubir; Hafni Indriati Nasution; Minda Shafina Syafei
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 1 (2019): January 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i1.16319

Abstract

CPL-4 and CPL-5 were synthesized with used 2,3 pyrazine dicarboxylic acid as main ligand , 4,4’-azopyridine(Apy) as linker ligand for CPL-4 and 1,2-di-(4-pyridil)ethylene(Bpe) for CPL-5 in water-ethanol(1:1) and temperature 250C. Three methods used in various reaction time and dropping method to metal ion with no stir treatment and also stirring or shaking treatment. CPL-4 have no magnetic field effect shows same XRD pattern in all synthesis method. Otherwise, CPL-5 with used method#03 shows different XRD pattern in 0T and 6T. By changing concentration of Cu2+ to 0.02 M, 6T crystal also shown different XRD pattern if compared with 6T crystal with 2 hours to 1 hours reaction time. It indicate of changing reaction between Hpzdc and Bpe with metal ion or reactivity both of ligand with metal ion induce different route under 6T. This process may effect to new crystal structure during synthesis in 6T..
Analysis of the Quality of Used Cooking Oil Used in Frying Chicken Dian I Sinurat; Ramlan Silaban
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 4, No 1 (2021): JANUARY 2021
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v4i1.23091

Abstract

This study aims to determine the quality of oil quality that is used repeatedly by frying chicken with the SNI. Bulk oil is used for frying the chicken with 11 frying repetitions. Repetition of oil before frying, repeat 1 time frying up to 10 frying times. Then the oil is tested for water content, Free Fatty Acid (FFA), peroxide value and iodine value. From this study, the quality of cooking oil was obtained for the range of: water content 0.03- 1.04%(w/w), Free Fatty Acids (FFA) 0.39-1.01%(w/w), peroxide value 5,99-18,465 mekO2/kg, iodine value 3.255-3.55 gI2/100g oil. Based on the various tests, the water content up to the oil from frying 3, Free Fatty Acid to oil from frying 3, the peroxide value to frying oil 4 still meets the SNI 01-3741-2013 oil quality standard. And in the iodine value test, all repeated frying results still meet the SNI 01-3741-2013 oil quality standard.
Using Water Hyacinth Fiber ( Eichhornia Crassipes) as Heat Absorbers Media In Wall Muhammad Rahmatullah Amin; Sefri Wahyu Fernando Gultom; Fitrisia Krisa Bella; Putri Lynna A. Luthan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13996

Abstract

Water hyacinth is aquatic weed plant that has medium fiber content with length about 1.75 – 2.12 mm and diameter about 11.15 – 11.65 μm in its stem. Water hyacinth contains 90% of water by weight reduction from 10 Kg when wet to 1 Kg when dry. In dry conditions, water hyacinth contains crude protein 13.03%, crude fiber 20.6%, fat 1.1%, ash 23.8% and the rest is vortex that contains polysaccharides and minerals. Research was done to obtain the design of heat absorbing product that modified with additional of water hyacinth. The method that was uesd begin with drying water hyacinth to obtain good fiber. water hyacinth fibers then mixed with cement and sand which are made as composites in order to reduce the heat of room. The result of the research is make a product that can overcome thermal comfort problems in deep room temperature condition. Water hyacinth was chosen because it is easy to obtain, cheap and can reduce environmental pollution (biodegradability) so that the composite can overcome environment ptoblem and its used doesn’t endanger health. Based on the test result by providing a heat source of 40 Watt bulb lamp to the media for 15 minutes, it was found that the final temperature of the media 1 without additional of water hyacinth fiber was 32.5oC, final temperature of media 2 with additional of 100 gr water hyacinth was 32.2oC, and the final temperature of media 3 with additional 150 gr water hyacinth was 31.7oC. it shows heat temperature that is released and cannot be absorbed by composite in media 3 is only 0.50C, in meida 2 is only 10C while in composite in media 1 without additional of water hyacinth fiber that release heat about 1.3oC. it shows that the product is suitable to use because composite with additional of water hyacinth can absorb heat and release less heat compared to composite without additional water hyacinth fiber so that the room become cooler.
Synthesis of Vinegar Acid with Raja Uli Banana Peel (Musa paradiaca) by Adding Bagasse Water (Saccharum officinarum) Nurhasanah Nurhasanah; Zona Octarya
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 1, No 1 (2018): Juli 2018
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v1i1.10189

Abstract

The large amount of banana peel waste that increased soil acidity and caused environmental pollution. Bagasse water was used to provide additional sugar besides using Raja Uli banana peel due to the use of sugar is less economical This study is aimed at making vinegar acid with Raja Uli banana peel by adding bagasse water as the weak electrolyte solution on electrolyte and non-electrolyte practice . The optimization was done at the time used for fermentation by varying the time 1, 2, 3, and 4 days in each fermentation step. For testing vinegar acid, FeCl3 and H2SO4 as the qualitative test and alkalimetric titration were used as the quantitative test. The results showed that the third day was the optimum time to produce alcohol content with an average percentage of 2.5% and optimum acetic acid of 0.063 g / 100 mL.
Synthesis of Fe and Zn Organic Fertilizer From Palm Oil Waste Lelita Rosanna Banjarnahor; Siti Rahmah; Marini Damanik; Moondra Zubir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 3, No 2 (2020): July 2020
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v3i2.19528

Abstract

Indonesia has been placed as the world's first producer of crude palm oil and crude palm oil.  In producing crude palm oil (CPO) and palm kernel oil (PKO), the palm oil industry relies heavily on processing fresh fruit bunches (FFB) at palm oil mills (POM) and is traded internationally. However, this process also produces solid organic waste [  i.e. empty bunches (EFB)], which reach up to 25 %% of FFB.  The analysis shows that the application of empty bunches as organic fertilizer has not been able to increase the amount of nutrients in palm oil leaves and increase palm oil production.  Application of palm oil mill effluent which is able to increase the amount of nutrients in palm oil, especially nitrogen and phosphate, and a positive impact to increase the production of oil palm plantations, especially on productivity (tons / ha).

Page 5 of 18 | Total Record : 179

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