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INDONESIA
EKSAKTA: Journal of Sciences and Data Analysis
Published by Universitas Islam Indonesia
ISSN : 27160459     EISSN : 27209326     DOI : 10.20885
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Materials Science & Nanotechnology
Ekstakta is an interdisciplinary journal with the scope of mathematics and natural sciences that is published by Fakultas MIPA Universitas Islam Indonesia. All submitted papers should describe original, innovatory research, and modelling research indicating their basic idea for potential applications. The Journal particularly welcomes submissions that focus on the progress in the field of mathematics, statistics, chemistry, physics, biology and pharmaceutical sciences.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 231 Documents
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Penentuan Usia Panen Terhadap Karakteristik Eucheuma Cottonii dari Perairan Pulau Pari Kepulauan Seribu Hilda Novianty
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 19, ISSUE 2, August 2019
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol19.iss2.art2

Abstract

Eucheuma cottonii adalah salah satu jenis makro alga merah yang memiliki sifat fungsional yang bermanfaat bagi kehidupan manusia seperti pembentuk gel, penstabil, pensuspensi, pembentuk tekstur emulsi yang dapat diaplikasikan dalam industri pangan dan non pangan, oleh sebab itu budidaya jenis makro alga ini sedang dikembangkan oleh Pemerintah dan menjadi salah satu produk unggulan non perikanan. Dalam budidaya makro alga, penentuan umur panen merupakan hal kritis yang dapat mempengaruhi mutu akhir produk. Kriteria penentuan mutu pada produk hasil budidaya Eucheuma dapat diketahui dari sifat fisiknya, salah satunya kekuatan gel yang dapat memunculkan sifat fungsional pembentuk gel pada produk pangan/non pangan. Pada penelitian ini bertujuan  untuk menentukan umur panen yang tepat terhadap kekuatan gel Eucheuma. Metode yang digunakan adalah non eksperimental deskriptif. Sample merupakan hasil budidaya dengan metode lone line dengan umur panen yang berbeda (35, 45 dan 55 hari panen) yang diujikan terhadap kekuatan gel. Hasil penelitian menunjukkan bahwa umur panen 35 hari memiliki nilai kekuatan gel terbesar yakni 430 g/cm2 dan kandungan fenol sebesar 77,96 mg/1000g.
Waste Cooking Oil Conversion To Biodeisel Catalized By Egg Shell Of Purebred Chiken With Ethanol As A Solvent Hellna Tehubijuluw; I Wayan Sutapa; Mealan Lethulur
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The synthesis of biodiesel from the waste cooking oil was carried out using the catalyst from egg shell of purebred chiken with ethanol as a solvent. Synthesis of biodiesel was prepared in two steps, esterification and transesterification. Esterification was conducted in mol ratio of ethanol and waste cooking oil of  9:1 with H2SO4 as a catalyst. Mol ratio of ethanol and used cooking oil in the transesterification of  12:1 with the CaO catalyst of shell eggs. CaO catalyst was yielded by calcinations egg shell of purebred chicken on 1000 for two hours. Calcination product was characterized with XRD to determine of CaO. Result of biodiesel was characterized based on FTIR, H-NMR, dan ASTM (American Standard Testing of Materials). Theoretically,yielded of biodiesel was 58% and experiment was 36.779%.
Synthesis Of Porous TiO2 With Starch Template And Its Photoactivity Towards Photodegradation Of Methylene Blue Gani Purwiandono; Indriana Kartini
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 15, ISSUE 1-2, 2015
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol15.iss1-2.art1

Abstract

Hydrothermal synthesis of TiO2 using starch as pores forming agent has been investigated. The research aimed to investigate the effect of crystallinity and porosity of TiO2 to its photocatalytic activity using photodegradation of methylene blue. TiO2 was synthesized without starch and with various starch concentration (0.5%, 2.5%, 5%, 10% w/v). The starch was dissolved in ethanol,and then was added drop wisely into titanium (IV) tetraisopropoxide(TTIP) solution. The mixture was treated hydrothermally at 100 ºC for 4 h. Starch templatewas removed through calcination at 450 ºC for 4 h. The synthesized TiO2 was characterized by FT-IR spectrophotometry. The effect of starch concentration toTiO2 crystallinity was analyzed using XRD. The porosity of the synthesized TiO2 was determined using N2 gas sorption analyzer. The photocatalytic activity of TiO2 was monitored through the photodegradation of methylene blue. The XRD patterns show that the TiO2 synthesized with various starch concentration consists mainly of anatase crystalline. The particle size of TiO2 synthesized with starch 5% w/v is 11.32 nm with the specific surface area (SBET) of 110.189 m2/g, the total pore volume of 0.2cc/g and the pore diameter of 3.62 nm. The photoactivity test demonstrates that the synthesized TiO2 could degrade methylene blue up to 56.9% under UV irradiation for 30 minutes
IMPROVEMENT OF THE PRODUCT AND QUALITY OF POGOSTEMON CABLIN BENTH Allwar Allwar; is fatimah; noor fitri; dwiarso rubiyanto
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Pogostemon cablin benth is an economic source of farmer communities which are presence in several provinces in Indonesia. In general, the production and quality of the Pogostemon cablin benth produced by the farmers are still low or under the standard ISO. The chelating method, the influence of pH and adsorption method with activated carbon and montmorilonite  were carried out to improve the production and quality of Pogostemon cablin benth. The results show that the production and the quality tends to be better proved by the color changes to yellow bright, reduced metal contents and an increase in Pogostemon cablin benth
Premium Pricing of Liability Insurance Using Random Sum Model Mujiati Dwi Kartikasari
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 17, ISSUE 1, February 2017
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol17.iss1.art5

Abstract

Premium pricing is one of important activities in insurance. Nonlife insurance premium is calculated from expected value of historical data claims. The historical data claims are collected so that it forms a sum of independent random number which is called random sum. In premium pricing using random sum, claim frequency distribution and claim severity distribution are combined. The combination of these distributions is called compound distribution. By using liability claim insurance data, we analyze premium pricing using random sum model based on compound distribution
The Bactericidal and Antibiofilm Activity of Stem Bark of Jatropha multifida L. Against Staphylococcus aureus and MRSA Annisa Fitria
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 18, ISSUE 1, February 2018
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol18.iss1.art5

Abstract

Chronical wound often caused by bacteria which has antibiotic resistance characteristic and presence of biofilm formation. This study aims to evaluate the bactericidal and antibiofilm activity of stem bark of Jatropha multifida L. against Staphylococcus aureus and MRSA (Methicillin-Resistant Staphylococcus aureus), as alternative antimicrobial agents. Examination of bactericidal activity of the extract was performed by time-kill assay to determine the speed of the extract to eradicate bacteria. The inhibitory activity of extract toward biofilm production was quantified using spectrophotometric method. The extract showed bactericidal activity which can be achieved at 8 hours and 12 hours against Staphylococcus aureus and MRSA in MBC value of 0.5 mg/mL and 1 mg/mL. The extract exhibited antibiofilm activity which indicates by its IC50 value of 0.3 mg/mL and 0.76 mg/mL against Staphylococcus aureus and MRSA. These experiments have shown the potential of the extract of  Jatropha multifida L. stem bark as a bioactive substance in a topical agent for chronical skin infection.  
Efek Jus Pisang Tongka Langit (Musa troglodytarum) Terhadap Ginjal Mencit (Mus musculus) Model Malaria Efraim Samson; Melati Sopacua; La Eddy
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 19, ISSUE 2, August 2019
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol19.iss2.art6

Abstract

High incidence of malaria cases encourage various treatments efforts including exploration of various local knowledge, related to utilization of medicinal plants. The tongka langit banana (Musa troglodytarum) is a unique and endemic plant species from Moluccas, wich based on public testimonies were belived to have ability to cure fever, hepatitis, malaria, increasing male stamina and make better kidney function. The purpose of this research was to examine the effect of tongka langit banana juice on the mice kidney (Mus musculus) of the malaria model. Twenty male mice were used which consist of 5 donor mice and 15 test mice further devided into 5 treatment groups, such as, K (+) group, K (-) group, P1 dose group with tongka langit banana intake (0,55 g/mice/day); P2 (0,65 g/mice/day); dan P3 (0,75 g/mice/day), each group consisted of 3 mice. The results showed, that feeding mice with tongka langit banana juice is effective to decreased kidney damages of mice malaria model, such as, hydropic degeneration, necrosis, and atrophy. Of the three dose given, 0,75 g/mice/day is the most effective dose.
Studi Adsorpsi Larutan Gliserol Menggunakan Karbon Aktif: Efek Konsentrasi, Tegangan Permukaan Dan Temperatur Yuniawan Hidayat; Atmanto Heru Wibowo; Dwi Ngandayani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

The effect of adsorbate concentration, surface tension and temperature on glycerol adsorption  over  activated  carbon  have  been  conducted.  Activity  of  adsorbent  was increased  by  soaking  activated  carbon  in  H2SO4  10%  solution  for  12  hours  followed heating  at  a  temperature  of  500oC  under  N2  gas  flow  for  3  hours.  Furthermore,  the identification  and  characterization  of  activated  carbon  were  done  by  infrared spectroscopy  (IR)    and  gravimetric  method  acidity  test.  Conditions  of  adsorption  of glycerol  by  activated  carbon  were  carried  out  using  batch  method  with  ±12  hours  of contact time on the variation of adsorbate concentration or the ratio glycerol : water (v/v) 1 : 2, 1 : 3, 1 : 4, and 1 : 5, as well as variations in 30, 40, 50, and 60 oC.  The  result  showed  that  increased  activity  of  activated  carbon  increased  acidity from 0.5 mmol/gram  to 2.7 mmol/gram.  Increasing concentration of glycerol causes  the surface  tension  decreases  and  (∂γ/∂C)  becomes  negative with means  that  glycerol was adsorbed  over  the  surface.  It  has  been  confirmed  by  the  increase  of  actvated  carbon capacity is proportional to the increased concentration of glycerol. Temperature was also playing the role of glycerol adsorption where at 60 oC maximum adsorption was riched.   Keywords:  Adsorption,  Glycerol,  Adsorbate  concentration, Temperature,  Surface tension, Activated Carbon
Identification and Heme Polymerization Inhibition Activity (HPIA) Assay of Ethanolic Extract and Fraction of Temu Mangga (Curcuma mangga Val.) Rhizome Dhina Fitriastuti; Tatang Shabur Julianto; Annisa Wahyu Nur Iman
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 1, February 2020
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol1.iss1.art10

Abstract

Curcuma mangga Val. is one of Indonesian herbs from Zingiberaceae family that is under explored and could contain potentially active substances to serve as an antimalarial. This research intends not only to examine the antimalarial activity by means of heme polymerization inhibitor mechanism by using the ethanolic extract and fraction of Curcuma mangga Val. but also to identify its compound classification. The extract of temu manga was obtained by Soxhlet extraction method using ethanol solvent followed by fractionation using Vacuum Liquid Chromatography with solvent sequence n-hexane, n-hexane: ethyl acetate (2:1), ethyl acetate and ethanol. The extract and fraction were analyzed by using LC-MS and GC-MS. Activities of hem polymerization inhibition showed by IC50 values which were obtained from analysis of relationship between concentration sample and the percentage of inhibition using the PROBIT on statistical software. The result of HPIA assay shows that the IC50 value of ethanolic extract and ethanolic fraction of Curcuma mangga Val. rhizome are 2.273 and 1.479 mg/mL, respectively. It clearly shows that the heme polymerization inhibition activity of ethanolic fraction relatively better than that of ethanolic extract. Phytochemical screening determines the ethanolic extract contains saponin, terpenoid, and phenol while the ethanolic fraction contains terpenoid. Thus, terpenoid compound is presumed to be the inhibitor of heme polymerization. The results of analysis with LC-MS and GC-MS showed that the active compounds suspected to inhibit heme polymerization in ethanolic extract and fraction were (E) -labda-8 (17), 12-dien-15,16-dial and di-n-octyl phthalate, respectively. Keywords: antimalarial, Curcuma mangga Val., heme polymerization
Chemical Stability of Cd(II) and Cu(II) Ionic Imprinted Amino-Silica Hybrid Material in Solution Media Buhani, Narsito, Nuryono, Eko Sri Kunarti
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 13, ISSUE 1-2, August 2013
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol13.iss1-2.art1

Abstract

Chemical stability of Cd(II) and Cu(II) ionic imprinted hybrid material of (i-Cd-HAS and i-Cu-HAS) derived from silica modification with active compound (3-aminopropyl)-trimethoxysilane (3-APTMS) has been studied in solution media. Stability test was performed with HNO3 0.1 M (pH 1.35) to investigate material stability at low pH condition, CH3COONa 0.1 M (pH 5.22) for adsorption process optimum pH condition, and in the water (pH 9.34) for base condition. Material characteristics were carried out with infrared spectrophotometer (IR) and atomic absorption spectrophotometer (AAS). At interaction time of 4 days in acid and neutral condition, i-Cd-HAS is more stable than i-Cu-HAS with % Si left in material 95.89 % (acid media), 43.82 % (close to neutral), and 9.39 % (base media).Keywords: chemical stability, amino-silica hybrid, ionic imprinting technique

Page 11 of 24 | Total Record : 231

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