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JURNAL KIMIA SAINS DAN APLIKASI

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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 789 Documents

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Potensi Antimikosis Beberapa Tumbuhan Obat Indonesia Dewi Kusrini; Khairul Anam; Bambang Cahyono
Jurnal Kimia Sains dan Aplikasi Vol 9, No 3 (2006): Volume 9 Issue 3 Year 2006
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah ditelaah potensi antimikosis tumbuhan Annona squamosa L (srikaya), Phylantus Acidus (L) Skeels (ceremai), and Phaleria Macrocarpa [Scheff] Boerl. (mahkota dewa) terhadap mikosis Candida Albicans. Ekstrak etanol srikaya mempunyai aktivitas tertinggi, setara dengan aktivitas 11.566,11 μg ketokenazol, dan ekstra etanol mahkota dewa setara dengan 2.344,46 g ketokenazol.

Effect of Acid on Natural Zeolite Dealumination on Indigo Carmine Adsorption Capability Nanik Sulistyowati; Sriyanti Sriyanti; Adi Darmawan
Jurnal Kimia Sains dan Aplikasi Vol 21, No 2 (2018): Volume 21 Issue 2 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Modifying natural zeolite with dealumination using H2SO4 and HCl, and its application to adsorb indigo carmine has been performed. Dealumination was carried out by reacting a natural zeolite with a mixture of KMnO4-H2SO4 and a mixture of KMnO4-HCl then refluxed for 5 hours followed by washing with demineralized water until a neutral pH was obtained and dried for 12 hours at 80°C. Dealuminated zeolites were then characterized by XRD, FTIR and Si/Al ratio measurements. Dealuminated zeolite was then used to adsorb indigo carmine in a batch-shaker system for 30 min with concentration variation XRD diffraction shows that natural zeolite and dealuminated zeolite contain modernit minerals. Dealumination increased the Si/Al ratio from 0.935 to 2.075 and 7.912 which meant that dealumination was successful. The indigo carmine adsorption result showed that zeolite adsorption capacity II> zeolite I> natural zeolite. FTIR data showed that there was no change of zeolite structure before and after adsorption

Pemisahan Ion Logam Timbal(II) Menggunakan Resin Terimpregnasi (SIR) dengan D2EHPA Ika Yunita; Muhammad Cholid Djunaidi; Abdul Haris
Jurnal Kimia Sains dan Aplikasi Vol 20, No 2 (2017): Volume 20 Issue 2 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Telah dilakukan penelitian Pemisahan Ion Timbal (II) Menggunakan Resin terimpregnsai (SIR) dengan D2EHPA. Pemisahan ion timbal(II) dari larutan dilakukan dengan menggunakan resin anion basa kuat (counter ion NO3-) dan D2EHPA (Asam di-2-etilheksilfosfat). Penelitian ini dilakukan untuk menentukan kondisi optimum pembuatan dan penggunaan resin terimpregnasi (SIR) dengan D2EHPA pada pemisahan ion timbal(II) dari larutan. Penelitian ini menggunakan teknik batch dan teknik kolom. Teknik batch dilakukan untuk menentukan pengaruh konsentrasi D2EHPA terhadap persentase adsorpsi, waktu kontak terbaik pada resin terimpregnasi, kapasitas resin, pengaruh pH larutan terhadap persentase adsorpsi, serta pengaruh pH backwash terhadap persentase recovery ion timbal(II). Teknik kolom dilakukan untuk pemisahan ion timbal(II) pada larutan sampel. Kecepatan alir kolom diatur konstan pada 2 mL/menit. Ion timbal(II) yang tidak teradsorpsi oleh resin terimpregnasi dianalisis secara kuantitatif dengan spektroskopi serapan atom pada panjang gelombang 283 nm. Hasil penelitian menunjukkan bahwa konsentrasi D2EHPA terbaik pada 1x10-3 M untuk setiap 50 gram resin anion basa kuat. Waktu kontak pada menit ke 30 sudah menunjukkan hasil yang cukup baik dan optimal pada menit ke 75 dari variasi waktu kontak 0-180 menit. Kapasitas resin terimpregnasi diperoleh 0,4817 mg Pb2+/g resin. Daerah pH terbaik larutan sampel ion timbal(II) pada pemisahan ion timbal(II) diperoleh pada pH 5 dengan persentase adsorpsi 99,52%. Persentase recovery ion timbal(II) yaitu 64,10% pada pH backwash 3. Dengan teknik kolom, semakin lama waktu alir semakin banyak ion logam timbal(II) yang tidak teradsorpsi oleh kolom.

Antioxidant from Turmeric Fermentation Products (Curcuma longa) by Aspergillus Oryzae Sulasiyah Sulasiyah; Purbowatiningrum Ria Sarjono; Agustina L. N. Aminin
Jurnal Kimia Sains dan Aplikasi Vol 21, No 1 (2018): Volume 21 Issue 1 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The antioxidant capacity of natural materials can be improved by fermentation. In this study, turmeric rhizome was fermented by Aspergillus oryzae. Fermentation products were obtained with fermentation time of 14, 21 and 28 hours. Furthermore, the fermentation product was extracted using ethanol and determined its antioxidant capacity by DPPH damping method, total phenolate determination and phytochemical screening. The results showed that the antioxidant capacity of fermentation products was higher than without fermentation. Antioxidant activity increased with length of fermentation with the value of antioxidant capacity without fermentation and with incubation for 14, 21, and 28 days respectively of 17.0; 27.3; 33.3; and 34.1 mg quercetin/gram extract. The total phenolate of fermentation products was 261; 324,3; 361; 374.3 mg of gallic acid/gram extract. Ethanol extracts of fermented and non-fermented products all contain entirely positive alkaloids, saponins, flavonoids, tannins, quinones, and steroids.

Optimasi Konsentrasi MgCl2 dan Suhu Annealing pada Proses Amplifikasi Multifragmens mtDNA dengan Metoda PCR Asyâ€™ari, Mukhammad; Noer, A. Saifuddin
Jurnal Kimia Sains dan Aplikasi Vol 8, No 1 (2005): Volume 8 Issue 1 Year 2005
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Polymerase Chain Reaction (PCR) merupakan metode amplifikasi Deoxyribonucleic acid (DNA) secara invitro. Hingga saat ini para peneliti baru berhasil mengamplifikasi secara in vitro DNA mitokondria (mtDNA)manusia Indonesia sampai ukuran fragmen maksimal 1,6 kilobasa (kb) dan belum dilakukan untuk â€œbanyakfragmenâ€ (multifragments). Pada penelitian ini telah berhasil diamplifikasi multifragments DNA mitokondriamanusia Indonesia berukuran 5,4 kb; 4,2 kb; 3,5 kb; 2,1 kb; 1,6 kb dengan metode PCR standar melalui optimasikonsentrasi MgCl2 dan suhu annealing. Proses berlangsung dalam satu reaksi PCR menggunakan enzim taqpolimerase, lima primer yaitu dmt-2L, dmt-1H, FL, FH dan MH pada kondisi bufer standar dengan konsentrasiMgCl2 2,5 mM, selama 30 siklus pada suhu denaturasi 94oC (15 detik), annealing 65oC (30 detik) danextension 72oC (180 detik). Keberhasilan metode amplifikasi in vitro multifragments yang mengandung fragmenpanjang tersebut diharapkan bisa membuat proses amplifikasi beberapa gen dalam satu genom menjadi lebihcepat dan efisien.

Statistical Approach for Water Glass Precursor Preparation from Bamboo Leaf Silica Silviana Silviana; Bakti Jos; Herry Santosa; Siswo Sumardiono
Jurnal Kimia Sains dan Aplikasi Vol 22, No 2 (2019): Volume 22 Issue 2 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The bamboo leaf consists of high silica content. In this study, the bamboo silica was utilized as water glass. Water glass can also be used as eco-friendly precursors for the preparation of silica aerogel. The extraction process of silica from bamboo leaf have been carried out through acid leaching and combustion process at 750°C based on thermal gravimetry analysis. This paper is aimed to assess the effect of two types of alkali hydroxide and concentrations producing water glass of bamboo leaf silica. The result was analyzed by using a 22-factorial design with six replications. The alkali hydroxide types were sodium hydroxide and potassium hydroxide with a concentration of 4 M and 6 M, respectively. The study was executed in several steps, i.e. pre-treatment of bamboo leaf, leaching process, combustion, purification of bamboo leaf silica and synthesis of water glass. The optimum condition of water glass products was obtained at silica concentration of 41.08 ppm and density of 1.23 g/L for potassium hydroxide, while at 40.15 ppm and 1.30 g/L for sodium hydroxide. ANOVA analysis resulted in a significant effect for type of hydroxide and concentration releasing model for silica concentration response. This study also characterized the silica structure and composition by instrumentation analysis for silica solid obtained from optimum water glass condition with potassium hydroxide. It can be denoted the physical behavior of silica solid from water glass by potassium hydroxide did not differ from previous research of water glass by sodium hydroxide.

Pembuatan Elektrolit Padat KMn2-xMgxO4 dengan Variasi Konsentrasi Larutan Kalium Asetat Cipto Harjono; Linda Suyati; Rahmad Nuryanto
Jurnal Kimia Sains dan Aplikasi Vol 14, No 2 (2011): Volume 14 Issue 2 Year 2011
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Proses pembuatan elektolit padat KMn2-xMgxO4 dengan variasi konsentrasi larutan kalium asetat telah dilakukan. Kalium sebagai ion logam dalam elektrolit padat berfungsi sebagai penghasil energi dengan proses elektrolisis sehingga perlu ditinjau pengaruh perubahan konsentrasi terhadap struktur dan daya hantar (konduktivitas). Penelitian ini menggunakan pemanasan secara bertahap dan metode sol-gel yaitu dengan mencampurkan larutan CH3COOK 0,1-0,5M, Mg(CH3COO)2 0,3M, Mn(CH3COO)2 dan C6H8O7 0,3M dengan pengadukan disertai pemanasan suhu 80°C, pengeringan pada 175°C, dan kalsinasi 650°C. Peningkatan konsentrasi mengakibatkan penurunan konduktivitas yaitu pada konsentrasi 0,1 M sebesar 36,90 S/m menjadi 13,75 S/m pada konsentrasi 0,5 M. Hasil FTIR menunjukkan adanya puncak 3332,99 cm-1dan 3170,97 cm-1 (K-O-Mn bending), 594,08 dan 478,35 cm-1 (Mg-O stretching), 1450,47 dan 1404,18 cm-1 (K-O stretching). Hasil XRD menunjukkan bahwa semua produk dalam bentuk kristalin dan struktur yang terbentuk adalah KMn1,7Mg0,3O4

Identifikasi Asam Lemak Penyusun Minyak Biji Karet (Hevea Brasiliensis) Menggunakan GC-MS Ismiyarto, Ismiyarto; Prasetya, Nor Basid Adiwibawa; Wibawa, Pratama Jujur
Jurnal Kimia Sains dan Aplikasi Vol 6, No 2 (2003): Volume 6 Issue 2 Year 2003
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Isolation of rubber seed (Hevea brasiliensis) oil have carried out by using soxhlet extraction with n-hexane as solvent. This research have been determined of fatty acid composition of rubber seed oil. Separation of free fatty acid from triglyceride done by ethanol 96 %. The oil phase was analysed by gas chromatography - mass spectrophotometer. It was resulted five chromatogram peaks of fatty acid methyl ester, there are methylester from palmitic acid (9.12%), linoleic acid (44.69 %), elaidic acid (44.69 %), stearic acid (8.89 %>) and 11,14-eicosadienoic acid (5.30 %) respectively.

Pemanfaatan Limbah Penyulingan Bunga Kenanga sebagai Kompos dan Pengaruh Penambahan Zeolit terhadap Ketersediaan Nitrogen Tanah Sriatun Sriatun; Sri Hartutik; Taslimah Taslimah
Jurnal Kimia Sains dan Aplikasi Vol 12, No 1 (2009): Volume 12 Issue 1 Year 2009
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Penelitian tentang pemanfaatan limbah distilasi bunga kenanga sebagai kompos dan pengaruh penambahan zeolit terhadap ketersediaan nitrogen di dalam tanah telah dilakukan. Pembuatan kompos dilakukan dengan metode penumpukan. Dilakukan tiga variasi perlakuan terhadap penyulingan limbah kenanga, yaitu (1) ditambahkan oleh EM4, (2) ditambahkan oleh EM4 dan serbuk gergaji (3) tanpa penambahan (sebagai kontrol). Variabel fisik seperti suhu, bau dan warna divariasi pada saat proses pengomposan. Analisis kimia berupa rasio C/N dilakukan terhadap kompos yang telah matang. Setelah itu, kompos ditambahkan zeolit dengan variasi jumlah yaitu 2%, 4% dan 6% dari berat kompos, kemudian diberikan pada tanaman jagung. Hasil penelitian menunjukkan bahwa kompos yang dibuat dari distilasi limbah bunga kenanga dan ditambah dengan EM4 yang mencapai suhu optimum pada suhu 39°C, siap dipanen setelah 21 hari dan memiliki rasio C/N sekitar 11,61. Sementara itu, kompos dengan penambahan EM4 dan serbuk gergaji dapat mencapai suhu optimum 45°C dan siap panen setelah 20 hari dan memiliki rasio C/N sekitar 43,81. Sedangkan kompos tanpa penambahan, suhu optimum tercapai pada suhu 37°C dan siap panen setelah 43 hari dengan rasio C/N sekitar 16,18. Penggunaan kompos yang ditambahkan zeolit pada tanaman jagung dapat meningkatkan laju nitrogen di tanah. Penambahan zeolit 2% meningkatkan nitrogen sebesar 0,96%, zeolit 4% equal to 1.90% and zeolite 6% equal to 3.31%.

Use of Microwave Radiation for Activating Carbon from Rice Husk Using ZnCl2 Activator Arnelli Arnelli; Ulya Hanifah Henrika Putri; Fandi Nasrun Cholis; Yayuk Astuti
Jurnal Kimia Sains dan Aplikasi Vol 22, No 6 (2019): Volume 22 Issue 6 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Activated carbon is one of the most commonly used adsorbents in a variety of separation processes because it is inexpensive, and also the design and principal of application are quite simple. The ability of activated carbon as an adsorbent is related to its large surface area and pore volume, varying pore structure, and diverse surface reactivity. The use of microwave radiation can further improve the efficiency of activated carbon adsorption. Micro-waves can affect the pore texture and surface of the activated carbon, but rarely do both practitioners and researchers control these variables influencing the relationship between features and performance of biomass-based activated carbon as an adsorbent at the time of manufacture from the initial stage (carbonation) to carbon application active (e.g., adsorption of heavy metals, surfactants, and organic molecules). This study aims to synthesize activated carbon from rice husk, which has the efficiency and capacity of adsorption of heavy metals such as Pb and activator organic molecules used is ZnCl2 30% and microwave radiation. This research has succeeded in making activated carbon using the ZnCl2 activator and microwave radiation. The time and power of microwave radiation that provides the highest efficiency in the carbon activation process for Pb ion adsorbate, were 7 minutes and 800 W. For phenol adsorbate was 5 minutes at 800 W. The highest efficiency time and concentration of adsorption for Pb ion adsorbate were 40 minutes at 60 ppm while for phenol adsorbate were 5 hours at 100 ppm. The adsorption efficiency for Pb cation adsorbate was 99.57%. While for phenol adsorbate is 81.05%. Characterization with FTIR, SEM-EDX, and SAA showed a C-Cl bond, the pores were visible, and an increased surface area of activated carbon was 36.9 times the surface area of carbon and the pores formed were mesoporous.

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Adi Darmawan

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adidarmawan@live.undip.ac.id

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jksa@live.undip.ac.id

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Kota semarang,

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