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Jurnal Kimia Terapan Indonesia

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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 08532788 EISSN : 25277669 DOI : -

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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Articles 273 Documents

1 2 3 4 5

The Synthesis of Quinidine Salicylate Ester Compound Nurjaya, Intan; Hanafi, Muhammad; Lotulung, Puspa D.N; Ernawati, Teni; Mursiti, Sri
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Quinidine a compound isolated from quinine plants, one of the species of quinine plants is (Chincona ledgereriana) From PT SIL Lembang. The purpose of this study was obtain quinidine salicylate ester through esterification reaction. In this study, the synthesis of quinidine ester compound by esterification reaction was conducted. Esterification reaction was conducted by using DCC activator and DMAP catalyst with one carboxylic acid namely salicylate acid producing new compound namely quinidine salicylate, Subsequent Quinidine salicylate was obtained in the form of oil with 97% yield. The compound obtained from the synthesis was then identified using Thin Layer Chromatography continue analyzed using with Spectrophotometer, LC-ESI-MS spectroscopy. Results show that the target compound has been successfully synthesized.

Mechanical and Barrier Properties of PVP-Carbon Dot Nanocomposite Films Sjahriza, Ahmad; Mas’ud, Zainal Alim; Sutirah, Komar
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

This research reported carbon dot were synthesized form citric acid and urea through a single step microwave process and Poly Vinyl Pirrolidone (PVP) films composited by carbon dot were prepared. The effects of different composition carbon dots on mechanical strength of films and water vapour barrier were evaluated. Highest mechanical yielded composite film were analyzed their thermal stability. Average of carbon dot diameter was found 90.61 nm and polydispersity indice 0.396. Different composition carbon dot exhibit significant improvement in tensile strength and modulus. Water permeablity of films varieate with content of carbon dot. The presence of carbon dot had a negligible effect on Tg of film and show melting process.

Antibacterial and Antioxidant activities of Indonesian ginger (jahe emprit) essential oil extracted by hydrodistillation Azizah, Nurul; Filaila, Euis; Salahuddin, Salahuddin; Agustian, Egi; Sulaswatty, Anny; Artanti, Nina
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

The rhizome of ginger is commonly used as a spice, food, beverage as well as medicine. Plant essential oils including from ginger have been widely used for food preservation, pharmaceutical and alternative medicines. Currently there are growing interest of consumer for natural sources such as essential oils for natural antibacterial and antioxidant. Jahe emprit (Zingiber officinale var. Amarum) is one of Indonesian ginger variety used to obtain ginger essential oil. The objective of current study was to investigate the effect of solvent to feed (SF) ratio in hydrodistillation process on yield, chemicals content, antibacterial and antioxidant activities of ginger essential oils from jahe emprit. SF ratio used in this study is 0.7: 1, 1.7: 1, 2.7: 1. Chemicals content was conducted using GCMS analysis. Antibacterial assay was conducted using disc diffusion method against Escherichia coli and Staphylococcus aureus. Antioxidant assay was conducted using DPPH free radical scavenging assay. The results show that the highest essential oil yield was obtained from SF ratio 1.7:1 which gave yield of 3.7%. GCMS analysis shows that camphene was always the major compound present in those 3 SF ratio, although the amount present was differed. Besides, 4 other major compounds present were varied. Antibacterial assay using 1% concentration showed ginger oil obtained from SF 0.7:1 and 2.7:1 have the same activities for S. aureus, whereas SF ratio 1.7:1 has the lowest activities. However for E. coli, all SF ratio gave same results. For antioxidant activities at 1000 ppm concentration, the highest activity was obtained from SF ratio 2.7:1

The Renewability Indicator and Cumulative Degree of Perfection for Gamboeng Tea; Part.2, Exergy Calculation of Tea Factory Bardant, Teuku Beuna; Haq, Muthia Syafika; Rahman Setiawan, Arief Ameir; Harianto, Sugeng; Waluyo, Joko; Mastur, Adhi Irianto; Lestari, Annisa Dieni; Sulaswatty, Anny; Sujarwo, Sujarwo; Rinaldi, Nino; Wiloso, Edi Iswanto
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Renewability Indicator (RI) and Cumulative Degree of Perfection (CDP) were used to observe sustainability of Gamboeng Tea. The assessment then compared with black tea process in Black Sea Region in Turkey from the previous study. Calculation of exergy for Gamboeng fresh tea leaf had already described in Part.1. Since the main process for both production was drying, then tropical humid climate in Gamboeng is the main challenge to increase efficiency, and thus, renewability. This second part described the significant improvement of renewability had applied in Gamboeng by using wood pellet in rotary pannier. Further recommended improvement were by installing better humidity detector and connected to the process control so the process can adapt the ambient change which the relative humidity can be varied from 65% and up to 92%.

Cover Inajac, Inajac
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Esterification of Waste Cooking Oil Using Ultrasonic: Kinetic Study Agustian, Egi; Jessica, Jessica; Untoro, Pudji; Sulaswatty, Anny
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 20, No 2 (2018)
Publisher : Research Center for Chemistry - LIPI

Waste cooking oil (WCO) have a great potential as an alternative raw material for producing biodiesel. The literatures kinetic of the esterification of WCO in the presence of phosphoric acid catalyst with ultrasonic assisted are rare and most literatures used conventional method. This study aims to determine the optimum condition and the parameters of first and second order kinetics of the WCO esterification which was assisted by ultrasonic bath. Variables that used in this study are methanol/oil mole ratio, acid catalyst concentration and reaction temperature. The highest conversion was 42.08% with methanol/oil mole ratio of 15:1, a catalyst (phosphoric acid) concentration of 9% wt and temperature of 50oC within 90 minutes. The reaction time was reduced to 3 times (minute) compare to conventional method and fatty acid reduced 42%. Kinetic parameters were calculated with assumption that the esterification was the irreversible reaction. The reaction rate constant increasing with temperature. The value of activation energy for esterification of WCO is 42.94 kJ/mol for first order reaction and 35.30 kJ/mol for second order reaction.

PEMISAHAN KROMATOGRAFI PADA FASA TERIKAT DIOl Kantasubrata, Julia
Jurnal Kimia Terapan Indonesia Vol 1, No 2 (1991)
Publisher : Research Center for Chemistry - LIPI

Chromatographic separation could not all be done on silica and alumina, therefore bonded phases have been developed by reacting organochiorosilane with the silanol group of silica. One of the new development of polar bonded phase is diol phase, which is prepared by reacting the silanol group of silica with GOX (glycidoxypropyttrimethoxysilane), Diol phase is widely applicated in TLC and normal phase HPLC. In -reversed phase HPLC, its application is limited, since with eluent containing water, it lasily swelled. Depending on the solute being separated, hidrogen bond, electron density and basicity play an important role in the retentiop mechanism. Its application on TLC plate make it possible to be used in bidimensional analysis. The application of dial phase is also discussed, eitherfor the exclusion separation of solutes with large molecular weight or for the separation of simple organic compounds such as steroids with normal phase chromatography mechanism.

KARAKTERISTISASI DAN UJI HOMOGENITAS KANDIDAT BAHAN ACUAN BUFER FTALAT DAN BUFER FOSFAT UNTUK PENGUKURAN DERAJAT KEASAMAN Sujarwo, Sujarwo; Nuryatini, Nuryatini
Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry) Vol 15, No 1 (2013)
Publisher : Research Center for Chemistry - LIPI

Measurement of pH is closely related to everyday life,such as in the area of environment, food and beverage,pharmaceuticals, and even metabolism process in humanbody. To ensure the quality of pH measurement, pH metershould be calibrated regularly and checked each time beforeused. Calibration and performance checking of pH meterrequires traceable standard. The standard should be linked toCRM (Certified Reference Materials). Research Center forChemistry - Indonesian Institute of Sciencesas the technicallaboratory in Indonesia for metrology in chemistry isconducting research in developing reference materials for pHmeasurement. The reference materials are phthalate andphosphate buffer withthe value of pH were 4.00±O.OJ and6.86±O. OJ, respectively at 95% confidence level (k=2).Homogenity study was evaluated based on F-test and theresults indicated that both reference materials candidate werehomogeneous.Keywords: Reference materials, CRM,phthalate buffer,phosphatebuffer,uncertainty,homogeneity.

HIDROGENOLISIS METILSIKLOPENTANA PADA KATALIS 0.3% Pt/Al2O3 Haerudin, Hery
Jurnal Kimia Terapan Indonesia Vol 6, No 1-2 (1996)
Publisher : Research Center for Chemistry - LIPI

Hydrogenolysis of methylcyciopentane (MCP) was carried out with 0.3% Pt/Al2O3 catalyst at 210 C and 235 C in a batch reactor. Chemisorption of hydrogen and oxygen on the catalyst had also been measured. The mean value of platinum dispersion on the catalyst support measured by chemisorption technique was D = 84%. The product distribution of hydrogenolysis of MCP, namely n- hexane : 2- methylpentane : 3-methylpentane was found to be 15: 55: 30 at 210 DCand 20: 50: 30 at 235 C. The adsorption of MCP molecule at the boundary area between the metal particle and the support material was assumed to be the determining factor for that distribution profile. The activation energy (Ea) of the hydrogenolysis of MCP on this catalyst was 95 kJ/mol.

PEMEKATAN PROTEIN DALAM SUSU DAN KECAP MENGGUNAKAN MEMBRAN SERAT BERONGGA Ahmad, Syahril
Jurnal Kimia Terapan Indonesia Vol 11, No 1 (2009)
Publisher : Research Center for Chemistry - LIPI

Concentration of protein which found in freshmilk, sweet ketchup and salt ketchup have been done byusing hollow fiber polysulfone membrane with differentmolecular weight cut - off (MWCO). Membranes usedin these experiments have MWCO 66,000, 87,000 and 149,000 Dalton. Experimental were conducted bycontinues flow system and parameters observed in these experimental were protein, sugar and salt, respectively.Protein infresh milk rejected by membrane above 98 %,but all of sugar pass through to the permeate side. Forsweet ketchup feed sample, rejection coefficient towardsprotein was smaller than feed fresh milk. The higherrejection coefficientfor sweet ketchup was 48 % for themembrane with MWCO 66.000 Dalton. Rejectioncoefficient of membrane towards protein for salt ketchup sample was smaller than sweet ketchup sample. For saltketchup, the higher rejection coefficient towards proteinwas 27 % for the membrane with MWCO 66,000Dalton. Rejection coefficient of membrane towardsNaCl for feeding solution sweet ketchup and saltketchup were in the rlJ.1Jgefrom 8.74 to 23.96 %.Key words : Hollow fiber membrane, ultrafiltration, protein,milk, ketchup.

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