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INDONESIA
JURNAL KIMIA SAINS DAN APLIKASI
Published by Universitas Diponegoro
ISSN : 14108917     EISSN : 25979914     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering
urnal Kimia Sains dan Aplikasi (p-ISSN: 1410-8917) and e-ISSN: 2597-9914) is published by Department of Chemistry, Diponegoro University. This journal is published four times per year and publishes research, review and short communication in field of Chemistry.
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Articles 8 Documents
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Search results for , issue "Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019" : 8 Documents clear
Antioxidant Activity of Daemonorops draco Resin Sri Purwanti; Wulan Tri Wahyuni; Irmanida Batubara
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1877.757 KB) | DOI: 10.14710/jksa.22.5.179-183

Abstract

Jernang resin is secretion of jernang rattan (Daemonorops draco, Arecaceae family) fruits which is endemic in Southeast Asia. This resin has various biological activities and empirically used as wound healing, headache medicines, and fever remedies by Anak Dalam ethnic group from Jambi. This study was performed to evaluate the antioxidant activity of nonpolar fraction of D. draco resin which collected from Jambi Province, Sumatera, Indonesia. Resin was extracted with n-hexane, ethyl acetate, and methanol respectively. The antioxidant properties of the extracts were then evaluated using 1,1-diphenyl-2picryl-hidrazyl radical scavenging assay. The most active extract was further fractionated using n-hexane and methanol and separated using column chromatography and preparative thin layer chromatography. Separation of the extract was conducted through antioxidant assay-guided fractionation. Characterization of the active fraction was carried out by infrared spectroscopy. The result shows that ethyl acetate extract provides higher antioxidant activity (IC50 = 27.61 µg/mL) compare to methanol and n-hexane extracts. N-hexane fraction of ethyl acetate extract used for further separation using column and preparative thin layer chromatography due to its antioxidant activity. Separation using column chromatography resulting in 9 fractions (F.1-9). Fraction F.5 provide high antioxidant activity (IC50 = 17.27 µg/mL) and further separated using preparative thin layer chromatography resulting two fractions with lower antioxidant activity F.5.1 (IC50 = 85.18 µg/mL) and F.5.2 (IC50 = 34.94 µg/mL). Characterization of fraction F.5.2 using infrared spectroscopy showed that component in fraction F.5.2 contains NH-substituted benzene.
Kinetika Reaksi Transesterifikasi Minyak Kedelai Menjadi Biodiesel dengan Katalis CaO Setiarto Pratigto; Istadi Istadi
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2634.923 KB) | DOI: 10.14710/jksa.22.5.213-219

Abstract

The use of biodiesel is expected to reduce dependence on fossil fuels. In this study, the kinetic reaction of transesterification of soybean oil with methanol will be assessed using heterogeneous CaO solid base catalyst with parameters of mole ratio of reactants to the conversion of methyl ester used to determine the reaction velocity equation. The reaction speed equation is used in the design of a fluidized CSTR (Continues Tank Reactor) reactor to obtain the reactor volume and catalyst weight. The purpose of this study was to determine the form of the velocity reaction equation for soybean and methanol transesterification reactions using CaO catalyst and determine the weight of the catalyst needed by using the reaction speed equation. The study was carried out by transesterification of soybean oil and methanol with CaO catalyst with the independent variable mole ratio of reactants while the fixed variable reaction temperature was 60°C, catalyst weight was 3% (% b/v), reaction time was 180 minutes. The results showed that methanol adsorbed on the surface of the catalyst and triglycerides not adsorbed on the surface of the catalyst showed that the mechanism of the catalytic reaction that occurred was the Eley-Rideal mechanism where one of the reactants was adsorbed on the surface of the catalyst. The form of the speed equation for the transesterification reaction of soybean oil and methanol using a CaO catalyst is  . The reaction speed equation is used in the design of the reactor, so that the relationship between the weight of the catalyst needed to convert triglycerides to biodiesel and the predicted calculation of the volume of the reactor used can be done.
Pengoptimuman Kondisi Adsorpsi Cd(II) oleh Adsorben Berbasis Silika Termodifikasi Glisina Menggunakan Central Composite Design Lisa Aprilia Indriyani; Zulhan Arif; Roza Linda; Henny Purwaningsih; Mohamad Rafi
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3234.437 KB) | DOI: 10.14710/jksa.22.5.184-191

Abstract

Silika gel (SG) merupakan salah satu jenis adsorben yang umum digunakan pada eksraksi fase padat untuk prakonsentrasi. Berhubung SG memiliki selektivitas dan efektivitas adsorpsi yang rendah terhadap ion logam, maka silika perlu dimodifikasi. SG dimodifikasi dengan d-glisina (Si-Gly) menggunakan 3-aminopropiltrimetoksisilana dan glutaraldehida sebagai penaut silang. Kemampuan Si-Gly sebagai adsorben ion kadmium (Cd) dipelajari dengan metode adsorpsi batch. Hasil modifikasi dibuktikan dengan spektrum inframerah. Kondisi optimum adsorpsi Cd dengan Si-Gly diperoleh pada pH 5, dengan bobot adsorben 0,3 g, dan waktu kontak 11 menit. Persentase adsorpsi Cd pada kondisi optimum oleh Si-Gly (99,34%) lebih besar daripada oleh SG (89,03%). Kapasitas adsorpsi maksimum Si-Gly terhadap Cd(II) ialah 9,77 mg/g yang diperoleh pada konsentrasi 400 mg/L. Pola adsorpsi SG dan Si-Gly terhadap Cd(II) mengikuti model isoterm Langmuir.
Kajian Metode foto-Fenton untuk Penurunan Konsentrasi Ion Logam Berat Pb(II) dan Cu(II) dalam Larutan Secara Simultan dan Sinergi Endang Tri Wahyuni; Dewi Supraba; Sigit Raharjo; Dwi Siswanta
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2843.225 KB) | DOI: 10.14710/jksa.22.5.192-199

Abstract

Untuk mencegah pencemaran lingkungan oleh ion logam berat berbahaya, pada penelitian ini telah dilakukan kajian secara sistematis penurunan konsentrasi ion Pb(II) dan Cu(II) dalam larutan secara simultan menggunakan metode foto-Fenton. Proses foto-Fenton berlangsung di dalam suatu reaktor tertutup secara batch. Proses tersebut dilakukan dengan cara menyinari larutan yang mengandung ion Pb(II) dan Cu(II), serta pereaksi Fenton (Fe2+ dan H2O2) dengan lampu UV-A. Dalam penelitian ini dilakukan optimasi konsentrasi awal ion Pb(II) dan ion Cu(II), dan waktu reaksi, dan kajian efek sinergi yang mungkin terjadi pada penurunan konsentrasi ion Pb(II) dan ion Cu(II) dalam larutan secara simultan melalui proses foto-Fenton. Konsentrasi ion logam Pb(II) dan Cu(II) dalam larutan ditentukan dengan alat AAS. Hasil penelitian menunjukkan bahwa proses foto-Fenton dapat menurunkan konsentrasi ion Pb(II) dan Cu(II), dan efektivitas penurunan yang maksimal tercapai pada konsentrasi ion Pb(II) 35 mg/L dan Cu(II) 35 mg/L dalam waktu 60 menit, yaitu masing-masing 46,12 % dan 16,86%. Penurunan konsentrasi ion Pb(II) dan Cu(II) masing-masing merupakan akibat oksidasi oleh radikal OH membentuk padatan PbO2 dan reduksi oleh elektron menjadi partikel Cu sebagaimana yang ditunjukkan oleh data EDX. Penerapan proses foto-Fenton terhadap larutan yang mengandung ion Pb(II) dan Cu(II) menghasilkan oksidasi ion Pb(II) dan reduksi ion Cu(II) secara simultan dan menunjukkan efek yang sinergi. Efek sinergi tersebut ditunjukkan oleh kenyataan bahwa keberadaan ion Cu(II) di dalam larutan Pb(II) yang mengalami proses foto-Fenton dapat meningkatkan efektivitas oksidasi ion Pb(II) dan peningkatkan tersebut tergantung pada konsentrasi ion Cu(II). Peningkatan oksidasi ion Pb(II) yang tertinggi (81,06%) ditunjukkan oleh adanya ion Cu(II) 35 mg/L. Demikian juga, adanya ion Pb(II) dengan konsentrasi yang bervariasi di dalam larutan Cu(II) yang mengalami proses foto-Fenton, dapat menaikkan efektivitas reduksi ion Cu(II). Kenaikkan fotoreduksi ion Cu(II) sejalan dengan konsentrasi ion Pb(II) yang ada dan kenaikkan reduksi ion Cu(II) yang maksimal (35,31%) tercapai dengan adanya Cu(II) 35 mg/L.
Pembuatan Recycle Screen Printed Carbon Electrode dan Aplikasinya untuk Deteksi Asam Galat dengan Teknik Voltammetri Wulan Tri Wahyuni; Rany Zalvianita; Rudi Heryanto
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3056.934 KB) | DOI: 10.14710/jksa.22.5.164-172

Abstract

Gallic acid is phenolic compound found in tea and act as antiradical agent. This compound is electrochemically active and could be detected using voltammetric technique. This study aims to obtain recycle screen printed carbon electrode (rSPCE) and applied it for voltammetric detection of gallic acid. rSPCE was prepared by modification of used SPCE working electrode using a mixture of graphite:polystyrene at ratio of 95:5, 90:10, and 85:15 (w/w). Graphite:polystyrene was suspended in chloroform and deposited on SPCE by drop casting method. Phosphate buffer 0.1 M at pH of 2.5, 3.5, and 7 were used as electrolyte solution in voltammetric detection of gallic acid. The optimum condition of gallic acid detection was obtained when phosphate buffer 0,1 M at pH of 2.5 and rSPCE in composition of graphite:polystyrene (95:5) used as electrolyte and working electrode, respectively. Gallic acid has 2 oxidation peaks at potential of 0.26 V and 0.63 V vs Ag/AgCl, respectively. At concentration of 1 – 5 mM, gallic acid and oxidation currents provide linear regression with the coefficient determination of 0.9947 and 0.9864, consecutively for peak number 1 and 2. Measurement of gallic acid at rSPCE 95:5 shows good precision with %RSD < 5%. rSPCE was successfully applied for voltammetric detection of gallic acid in standard solution with accuracy > 96%, however further development is needed before its application for gallic acid measurement in real sample such as tea extract.
Sintesis Nanopartikel Perak (NPAg) Menggunakan Ekstrak Air Buah Andaliman (Zanthoxylum acanthopodium DC.) dan Aplikasinya pada Fotodegradasi Indigosol Blue Gusti Ayu Dewi Lestari; Iryanti Eka Suprihatin; James Sibarani
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2495.226 KB) | DOI: 10.14710/jksa.22.5.200-205

Abstract

Nanopartikel perak (NPAg) adalah partikel logam perak yang memiliki ukuran kurang dari 100 nm. NPAg memiliki beberapa keunggulan, salah satunya sebagai katalis dalam proses fotodegradasi. NPAg diperoleh dengan mereduksi AgNO3menggunakan ekstrak air buah andaliman (Zanthoxylum acanthopodium DC.). Metode sintesis ini sangat efektif karena cepat, tidak beracun dan teknologi yang ramah lingkungan. Penelitian ini bertujuan untuk mensintesis NPAg optimum dan aplikasinya dalam proses fotodegradasi Indigosol Blue berupa volume, waktu iradiasi, dan pH optimum. Sintesis NPAg diamati menggunakan spektrofotometer UV-VIS sedangkan ukurannya diamati menggunakan PSA (Particle Size Analyzer). Hasil penelitian menunjukkan sintesis NPAg terbaik menggunakan AgNO3 1x10-3 M pada suhu 60°C dengan ukuran NPAg 9,04 nm. NPAg yang terbentuk stabil selama ± 35 hari. Kondisi optimum fotodegradasi adalah menggunakan 2 mL NPAg selama 4 jam irradiasi pada pH 3. Dari hasil penelitian ini dapat disimpulkan bahwa NPAg mampu menurunkan konsentrasi zat warna Indigosol Blue sampai dengan 94,75%.
Aktivitas Antibakteri Loloh (Obat Tradisional Bali) Air Perasan dan Air Rebusan Daun Sirih terhadap Bakteri Streptococcus pyogenes Penyebab Radang Tenggorokan I Made Sumarya; I Wayan Suarda; Ni Luh Gede Sudaryati
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2442.967 KB) | DOI: 10.14710/jksa.22.5.173-178

Abstract

Sore throat is a respiratory infection caused by a bacterial infection of Streptococcus pyogenes. Betel leaf is used for loloh (traditional medicine) which has antimicrobial activity. The purpose of this study was to determine the content of active compounds and the antibacterial activity of the boiled water and juice of betel leaf against Streptococcus pyogenes. Explorative research using GC-MS method was used to identify and determine the abundance (content) of active compounds from loloh while the experimental research with the Randomized Post Test Only Control Group Design was carried out by treating the samples in four groups those are the negative control group with distilled water, the positive control group with 30 μg vancomycin, the treatment group with boiled water of betel leaf and betel leaf juice water to prove the antibacterial activity of loloh. The antibacterial activity data of the study results were analyzed statistically nonparametric through the Kruskal-Wallis test. The results showed that the betel leaf boiled water contained 0.472% hydroxicavicol active compound and had an average antibacterial activity of 6.50±0.224 mm against Streptococcus pyogenes bacteria. Whilst the juice of betel leaves did not contain active compounds and had no antibacterial activity.
Identifikasi Senyawa Aktif Ekstrak Buah Mengkudu (Morinda citrifolia L.) dan Potensinya sebagai Antioksidan Sogandi Sogandi; Rabima Rabima
Jurnal Kimia Sains dan Aplikasi Vol 22, No 5 (2019): Volume 22 Issue 5 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2716.322 KB) | DOI: 10.14710/jksa.22.5.206-212

Abstract

Antioxidants are compounds that can inhibit oxidation reactions by binding to free radicals and highly reactive molecules. One form of reactive oxygen compounds is free radicals, these compounds are formed in the body and are triggered by various factors. Noni fruits have been used by the community as a medicine for high blood pressure, beriberi, urinating, inflammation of bile, inflammation of the intestine, dysentery, constipation, spleen pain, liver pain, diabetes and lumbago. Nevertheless, research on the identification of the active compounds of noni fruit which act as antioxidants yet. This study aims to extract and fractionation of Noni fruit, determine the antioxidant activity of Noni fruit extract, and identify the types of bioactive compounds that act as antioxidants. Noni fruit was extracted used maceration technique with 96% ethanol and then fractionated using n-hexane, chloroform and ethyl acetate solvents. Antioxidant activity from the results of noni fruit fractionation was measured by the DPPH (1.1 diphenyl-2-picrylhydrachyl) method and identification of bioactive compounds was carried out by GCMS. The results showed the greatest antioxidant activity was found in chloroform fraction with a percentage of inhibition of 78.19%. For the first time this study revealed the types of bioactive compounds from noni fruit ethyl acetate fraction which act as antioxidants are n-hexadecanoic acid, squalene, pyridin-3-carboxamide, oxime, n- (2-trifluoro methyl phenyl), and beta-sitosterol

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