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All Journal Reaktor JURNAL KIMIA SAINS DAN APLIKASI Chem Info Indonesian Journal of Chemistry Journal of Physics and Its Applications JURNAL PHOTON Borobudur
Tri Windarti
Department Of Chemistry, Faculty Of Science And Mathematics, Universitas Diponegoro, Jl. Prof. Soedharto SH, Tembalang, Semarang 50275, Indonesia
Agriculture, Biological Sciences & Forestry Arts Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Nursing Physics

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SINTESIS DAN IDENTIFIKASI SENYAWA 5-(4-FLUOROFENIL)-3-(NAFTALEN-2-IL)-4,5-DIHIDRO-1H-PIRAZOL Windarti, Tri; Teruna, Hilwan Yuda; Jasril, -
Sistem Informasi Vol 6 No 01 (2015): Jurnal Photon
Publisher : Fakultas MIPA dan Kesehatan Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.244 KB)

Abstract

Pirazolin merupakan metabolit sekunder golongan alkaloid yang telah dilaporkan memiliki berbagai macam bioaktivitas seperti antimikroba, antiinflamasi, antioksidan dan antikanker. Oleh karena itu, pirazolin banyak dijadikan sebagai model struktur senyawa target oleh para peneliti. Senyawa pirazolin yaitu 5-(4-fluorofenil)-3-(naftalen-2-il)-4,5-dihidro-1H-pirazol telah disintesis dari (E)-3-(4-fluorofenil)-1-(naftalen-2-il)prop-2-en-1-on dengan hidrazin hidrat dan menggunakan katalis asam asetat serta diiradiasi gelombang mikro. Kemurnian senyawa telah diuji menggunakan KLT, uji titik leleh dan analisis HPLC. Struktur senyawa pirazolin diidentifikasi berdasarkan interpretasi data spektroskopi UV dan IR. Hasil senyawa sintesis tersebut adalah 67,45%.
Effect of Milling Time on nanostructured Hydroxyapatite Results Synthesis by Precipitation Method Pratiwi, Sari; Windarti, Tri; Nurhasanah, Iis
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Abstract

A study "Effect of Milling Time on Nanostructured Hydroxyapatite Synthesis Results by Precipitation Method" in purpose to know the effect of milling time on purity, phases and size of hydroxyapatite crystals synthesized. Hydroxyapatite (HA) were synthesized by the method of precipitation by adding dropwise a solution of CaCl2 to a solution of KH2PO 4 which has been conditioned at pH 9 with stirring and heated at 40 °C for 4 hours. The resulting suspension was allowed to stand for 20 hours. Product of precipitation milled using a Planetary Ball Mill at 880 rpm angular velocity and the ratio of powder/ballmill 1:10 with milling time variation 0, 5, 15, 30 and 60 minutes. Based on the FTIR and XRD, it was concluded that the HA produced by milling time of 60 minutes has not been able to achieve high purity. Another type of calcium phosphate formed on the product is calcium hydrogen phosphate anhydrous (CHPA). The longer the milling time, the smaller the size of HA crystals. Size of HA crystals are formed on the nanometer scale is 49.85 nm; 38.30 nm; 34.84 nm; 33.44 nm and 30.44 nm.
SINTESIS HIDROKSIAPATIT DARI BATU KAPUR ALAM SECARA MEKANOKIMIA DENGAN VARIASI WAKTU PENGGILINGAN Riqti, Frederica Thalita; Windarti, Tri; Sutanto, Heri
Chem Info Journal Vol 1, No 2 (2013)
Publisher : Chem Info Journal

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Abstract

A study entitled synthesis of hydroxyapatite from natural limestone with variations mechanochemical milling time. The purpose of this research was to produce hydroxyapatite and to determine the effect of milling time on the purity, phases, and crystallite size on the synthesis of hydroxyapatite from limestone with mechanochemical method. The principle of this method is that the reaction between solids with the help of mechanical energy. Limestone that has been mashed mixed with powdered KH2PO4, mechanochemical process is then performed with the variation of time 0, 70, 80, 90, and 100 minutes. The resulting products were analyzed with FTIR and XRD and calculated by Scherrer equation to determine the crystallite size. Based on XRD and FTIR result, dominant types of calcium phosphate produced in this research were hydroxyapatite (HA) and tetracalcium phosphate (TTCP). Crystallite size of HA was formed on the time variation of 70, 80, 90, and 100 minutes ie 40.66 nm, 39.03 nm, 36.84 nm, and 39.78 nm.
Pengaruh Konsentrasi Ca2+ dan (PO4)3- pada Pembentukan Hidroksiapatit di dalam Matriks Selulosa Bakterial Windarti, Tri; Astuti, Yayuk
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.55 KB) | DOI: 10.14710/jksa.9.3.60-64

Abstract

Pembentukan hidroksiapatit Ca10(PO4)6(OH)2 dalam matriks selulosa bakterial dilakukan dengan cara merendam selulosa bakterial dalam larutan CaCl2 selama 18 jam, dilanjutkan dengan merendam dalam larutan KH2PO4 selama 18 jam pada pH 9. Perendaman tersebut dilakukan dengan berbagai variasi konsentrasi Ca2+ dan PO42-. Kadar kalsium yang terdeposit dalam selulosa bakterial dianalisis dengan AAS. Kadar fosfat dianalisis dengan Stannous Chloride methode dan untuk mengetahui apakah kalsium fosfat yang terdeposit membentuk struktur hidroksiapatit, dilakukan analisis dengan difraksi sinar X. Difraktogram sinar X menunjukkan telah terbentuk struktur hidroksiapatit dalam matriks selulosa bakterial dan rasio ideal C/P hidroksiapatit sebesar 1,676 terjadi pada perbandingan Ca2+: PO43- = 125 : 25.
Pirolisis Campuran Polietilena-Tempurung Kelapa Windarti, Tri; Ruseno, Ruseno
Jurnal Kimia Sains dan Aplikasi Vol 9, No 1 (2006): Volume 9 Issue 1 Year 2006
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.038 KB) | DOI: 10.14710/jksa.9.1.10-13

Abstract

Telah dilakukan penelitian tentang pirolisis campuran polietilena-tempurung kelapa untuk mengetahui pengaruh komposisi campuran polietilena-tempurung kelapa terhada produk cair yang dihasilkan. Enam puluh gram campuran polietilena-tempurung kelapa dengan perbandingan 5:1, 4:2, 3:3, 2:4, 1:5 (b/b) dipirolisis pada temperatur 300oC. Uap organik yang dihasilkan kemudian didinginkan dengan pendingin es-garam sehingga diperoleh produk cair dan dianalisis dengan GC dan GC-MS. Hasil menunjukkan bahwa pirolisis campuran polietilena-tempurung kelapa pada temperatur 300oC diperoleh produk cair yang makin meningkat dengan meningkatnya jumlah polietilena di dalam campuran. Senyawa utama dalam produk cair adalah senyawa dengan rantai karbon C4 – C11.
Preparasi Katalis Zeolit Alam Asam sebagai Katalis dalam Proses Pirolisis Katalitik Polietilena Windarti, Tri; Suseno, Ahmad
Jurnal Kimia Sains dan Aplikasi Vol 7, No 3 (2004): Volume 7 Issue 3 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (251.038 KB) | DOI: 10.14710/jksa.7.3.72-77

Abstract

Telah dilakukan penelitian tentang preparasi katalis zeolit alam asam sebagai katalis dalam proses pirolisis katalitik polietilena. Katalis zeolit alam asam dibuat melalui aktivasi dan kalsinasi zeolit alam Wonosari yang meliputi perendaman dalam larutan HF 1 %, perlakuan HCl, perendaman dalam larutan NH4Cl dan kalsinasi dengan dan tanpa gas N2. Proses kalsinasi dilakukan pada temperatur 500 C. Karakter katalis yang meliputi rasio Si/Al, keasaman, luas permukaan, volume pori dan rerata jejari pori, masing-masing ditentukan dengan Spektroskopi Serapan Atom (AAS), metode adsorpsi NH3 dan alat penganalisis luas permukaan. Hasilnya adalah preparasi telah meningkatkan keasaman zeolit sebesar 132,5 %, rasio Si/Al sebesar 146,9 %, luas permukaan sebesar 748 %, volume pori sebesar 98 % dan menurunkan rerata jejari pori sebesar 76 %. Proses pirolisis dan proses pirolisis katalitik dilakukan dengan reactor bach dan produk cair dianalisis dengan GC dan GC-MS serta FTIR. Produk proses pirolisis polietilena adalah olefin C9 – C15 sedangkan produk pirolisis dengan katalis zeolit alam asam adalah olefin C5 – C12.
THE CALCINATION TEMPERATURE EFFECT ON THE ANTIOXIDANT AND RADIOPROTECTION PROPERTIES OF CeO2 NANOPARTICLES Iis Nurhasanah; Weni Safitri; Tri Windarti; Agus Subagio
Reaktor Volume 18 No. 1 March 2018
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (653.323 KB) | DOI: 10.14710/reaktor.18.1.22-26

Abstract

The CeO2 nanoparticles are very interesting to be studied as biomedical materials due to its unique physical and chemical properties. The non-stoichiometric properties of CeO2 play a role in the redox/catalytic processes that scavenging free radicals. These properties make CeO2 nanoparticles as being potentially antioxidant and radioprotector materials. In this paper, we report the calcination temperature effect on the antioxidant properties and  radioprotective effect of CeO2 nanoparticles synthesized by precipitation method. The CeO2 nanoparticles were synthesized by precipitation method at various calcinations temperatures (300oC – 700oC). The formation of CeO2 nanoparticles and crystallite size was analyzed using X-ray diffractometers. The DPPH method was used to investigate antioxidant properties of CeO2.  Dose Enhancement Factor (DEF) of CeO2 nanoparticles were determined by measurement of the absorbed dose of X-ray radiation (Linac 6 MV 200 MU). X-ray diffraction pattern showed formation of cubic fluorite of CeO2 nanoparticles with crystallite size in the range 9 nm-18 nm.  Calcination temperature of 500oC resulted in CeO2 nanoparticles with the best antioxidant properties and lowest DEF value. The radioprotection effect of CeO2 nanoparticles was evaluated based on Escherichia coli survival toward X-ray radiation with a dose of 2 Gy. The CeO2 nanoparticles increased Escherichia coli survival of about 24.8% order.  These results suggested that CeO2 nanoparticles may potentially be as radioprotector of X-ray Linac 6 MV. Keywords: Antioxidant, CeO2 nanoparticles, Dose Enhancement Factor (DEF), radioprotector
Dose Distribution 6 MV of X-Ray Photon Beam over Cerium Oxide Nanoparticles Solution Iis Nurhasanah; Hella Arofah; Agus Subagio; Eko Hidayanto; Tri Windarti
Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i1.9316

Abstract

CeO2 nanoparticles are biomaterial that demonstrate potential as antioxidant and radioprotector for medical application. In this study, the radioprotector properties of CeO2 nanoparticles was evaluated by measuring absorbed dose of X-ray radiation. CeO2 nanoparticles were synthesized by precipitation and characterized using UV-Vis and FTIR spectrometers. CeO2 nanoparticle solution was prepared with various concentrations from 0.005 mg/mL to 0.06 mg/mL. The solution was exposed to 6 MV X-ray photon beam from medical linear acceleration with a source-to-surface distance of 100 cm and radiation dose of 2 Gy. The absorbed dose of X-ray by CeO2 nanoparticle solution was measured by an ion chamber detector. The absorbance peak at 301 nm observed in UV-Vis spectrum and absorbance peak at 854 and 492 cm-1 in the FTIR spectrum confirmed the formation of CeO2 nanoparticles. Radiation dose measurement exhibited dose reduction of CeO2 nanoparticles solution depend on concentration. CeO2 nanoparticle solution with concentration higher than 0.04 mg/mL showed potential application for radioprotector 6 MV of X-ray photon beam.
Deposition of Hydroxyapatite on Silica Made from Rice Husk Ash to Produce the Powder Component of Calcium Phosphate Cement Tri Windarti; Widjijono Widjijono; Nuryono Nuryono
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.57900

Abstract

Hydroxyapatite (HA) has been deposited on silica (SiO2) particles to produce HA-SiO2 composite that will be used as the powder component of calcium phosphate cement. HA was expected to be on the composite surface to maintain its bioactivity. SiO2 was made by the sol-gel method, in which silicate solution was extracted from rice husk ash with NaOH solution. Deposition of HA on SiO2 was carried out by wet chemical deposition method at various Ca/Si molar ratio (in a range of 5–25) followed by calcination at 600 °C for 2 h. Results showed that HA was successfully deposited on SiO2 particles. The cell parameters of the HA crystals were slightly distorted by the presence of SiO2 and HA in the composite had a bigger cell volume than pure HA. The crystallite size of HA in the composites increased with the increase of the Ca/Si ratio but the values were smaller than pure HA. SiO2 acted as a morphology directing agent. At low Ca/Si ratio, the HA-SiO2 particles were in a form of short rod-like particles with sizes of < 50 nm, while at high Ca/Si ratio, a mixture of short and long rod-like particles with the size of < 100 nm was obtained. The zeta potential of composites was almost similar to pure HA. These properties indicated that HA-SiO2 composites support the bioactivity of injectable calcium phosphate cement.
KITOSAN TERMODIFIKASI TRIPOLIFOSFAT SEBAGAI KANDIDAT MATERIAL PELAPIS ARTEFAK KAYU Tri Windarti; Fenina Azalia Dewi Hascaryo
Borobudur Vol. 16 No. 1 (2022): Jurnal Konservasi Cagar Budaya Borobudur
Publisher : Balai Konservasi Borobudur Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33374/jurnalkonservasicagarbudaya.v16i1.270

Abstract

Chitosan is one of natural polymers that has been widely developed for the conservation of wood artifacts. Chitosan modification with tripolyphosphate (TPP) crosslinker aims to change the linear structure of chitosan into networking. This structural change is expected to improve the performance of chitosan coating on the surface of wood artifacts. The aims of this research are to study the effect of NaTPP concentration (0.5 – 10%) as a source of TPP and sonication time (5 – 25 minutes) on the structure and morphology of chitosan. The results showed that identification of phosphate content by using UV-Vis spectrometer confirmed that no phosphate ion found in the remaining reaction solution. Treatment with sonication caused all TPP ions to physically interact with chitosan. FTIR spectra are difficult to confirm the presence of TPP because of the overlap between the energy of the phosphate vibration and the C-O stretching vibration of chitosan. TPP modified chitosan is in the form of a thin and transparent film. SEM images show that the surface of the chitosan is flat, dense and non-porous. The results of the elemental composition test with EDX showed the presence of carbon (64.98%), nitrogen (0.2%), oxygen (34.69%), and phosphorus (0.01%) on the chitosan surface. Thus, TPP-modified chitosan can be used as a candidate for wood artifact coating material, to avoid the infiltration of water molecules in the air without changing the original appearance of the artifact.
Co-Authors Agus Subagio Ahmad Suseno Eko Hidayanto Fenina Azalia Dewi Hascaryo Frederica Thalita Riqti Hella Arofah Heri Sutanto Hilwan Yuda Teruna Iis Nurhasanah Jasril Jasril Limpat Nulandaya Ngadiwiyana M.Si. S.Si. Nor Basid Adiwibawa Prasetya Nuryono Nuryono Ruseno, Ruseno Sari Pratiwi Weni Safitri Widjijono Widjijono Yayuk Astuti