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All Journal Jurnal Ilmu Kimia Universitas Brawijaya Indonesian Green Technology Journal Natural B The Journal of Pure and Applied Chemistry Research Indonesian Journal of Chemistry Logista: Jurnal Ilmiah Pengabdian Kepada Masyarakat JKPK (Jurnal Kimia dan Pendidikan Kimia) Journal of Research on Community Engagement
Ika Oktavia Wulandari
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Brawijaya
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Engineering Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences Other

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Effect of Stirring Speed on Characteristics of Fe3O4 Nanoparticles Coated with Polyvinyl Alcohol and Glutaldehyde as a Crosslinker Rahayu, Lale Budi Hutami; Wulandari, Ika Oktavia; Santjojo, Djoko Harry; Sabarudin, Akhmad
Natural B, Journal of Health and Environmental Sciences Vol 4, No 3 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (719.323 KB) | DOI: 10.21776/ub.natural-b.2018.004.03.1

Abstract

Research on Fe3O4 nanoparticles is mostly done because of the unique nature of Fe3O4 which has magnetic properties, non-toxic, biocompatible and easily degraded so it is interesting to investigate as a drug delivery system. This nanoparticles were successfully synthesized by coprecipitation method with variations of stirring rate were 180 rpm (sample A), 250 rpm (sample B) and 320 rpm (sample C). FTIR analysis of Fe3O4 nanoparticles, was absorption at ~585 cm-1 for samples A and B showing the presence of Fe-O magnetite bond and absorption at ~623 cm-1 which were not very sharp for maghemite. However the sample B, only absorption at ~623 cm-1 which is sharp for maghemite (γ-Fe2O3) because of Fe2O3 cubic is not formed. SEM analysis did not show significant morphological differences in velocity variation. From XRD analysis known that the crystal size for samples A and B respectively of 6.4192 nm and 9.5513 nm for sample C could not be calculated because of many iron oxide phases present in it, so it is difficult to find FWHM. ESR analysis of nanoparticle samples shown Fe3O4 properties were ferromagnetic.
SINTESIS DAN KARAKTERISASI FOTOKATALIS ZnO PADA ZEOLIT Wulandari, Ika Oktavia; Wardhani, Sri; Purwonugroho, Danar
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 2 (2014)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.151 KB)

Abstract

Dalam penelitian ini dilakukan sintesis fotokatalis ZnO yang terimpregnasi pada zeolit serta karakterisasi fotokatalis. Impregnasi ZnO dilakukan melalui penambahan zeolit ke dalam larutan Zn(NO3)2 dengan konsentrasi 0,05 dan 0,1 M. Konsentrasi fotokatalis ZnO pada zeolit yang dihasilkan dari proses impregnasi adalah 0,75 dan 1,5 mmol ZnO/g zeolit. Hasil karakterisasi dengan Diffuse Reflectance Spectroscopy (DRS) menunjukkan energi celah untuk katalis ZnO pada zeolit adalah 3,06 eV. Keberadaan ZnO pada zeolit ditunjukkan dengan puncak yang muncul pada bilangan gelombang 470,63 dan 941,26 cm-1. Berdasarkan hasil karakterisasi dengan Surface Area Analyzer (SAA) diperoleh luas permukaan zeolit teraktivasi serta ZnO pada zeolit 0,75 dan 1,5 mmol ZnO/g zeolit masing-masing sebesar 113,689; 51,144; dan 46,289 m2/g. Identifikasi kemampuan katalitik dilakukan melalui fotodegradasi zat warna methylene blue. Persen degradasi zat warna dengan penambahan 0,75 dan 1,5 mmol ZnO/g zeolit masing-masing sebesar 89,832 dan 78,286%.   Kata kunci : fotodegradasi, fotokatalis, methylene blue, zeolit, ZnO
Sintesis dan Karakterisasi Nanopartikel Fe3O4 termodifikasi Biokompatibel Polimer serta Potensinya sebagai Penghantar Obat Ika Oktavia Wulandari; Lale B Rahayu; Imam Riva’i; Hermin Sulistyarti; Akhmad Sabarudin
The Indonesian Green Technology Journal Vol 10, No 1 (2021)
Publisher : Program Pascasarjana Universitas Brawijaya

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Abstract

Nanopartikel sebagai agen penghantar obat berbasis Fe3O4 dalam penelitian ini disintesis dengan dua metode, yakni metode kopresipitasi dan metode sonikasi. Permukaan Fe3O4 selanjutnya dimodifikasi dengan penambahan biokompatibel polimer berupa Polivinil Alkohol (PVA) yang terikat silang dengan Glutaraldehid. Penelitian ini juga dilakukan untuk mengidentifikasi pengaruh komposisi PVA terhadap sifat fisik dan magnetik material yang meliputi ukuran kristal, parameter kisi, dan faktor g-lande. Metode kopresipitasi dengan lama waktu reaksi 30 menit mampu menghasilkan nanopartikel dengan ukuran lebih kecil dibandingkan dengan metode sonikasi dalam durasi waktu reaksi yang sama. Namun demikian, apabila waktu sonikasi diperpanjang yaitu selama 60 menit, maka akan diperoleh nanopartikel bare Fe3O4 dengan ukuran yang lebih kecil. Selanjutnya penambahan PVA dan GA sebagai capping agent pada permukaan Fe3O4 dimaksudkan untuk mereduksi pembentukan agregat dan proses oksidasi dari Fe3O4 untuk menghasilkan fasa besi oksida lainnya. Penambahan polimer PVA meningkatkan ukuran kristal nanopartikel dibandingkan nanopartikel Fe3O4 tanpa PVA. Namun peningkatan ukuran yang terjadi tidak lebih dari 20 nm. Modifikasi permukaan juga mempengaruhi ukuran parameter kisi. Selain itu pelapisan permukaan Fe3O4 dengan PVA dapat mereduksi proses oksidasi nanopartikel Fe3O4 yang dihasilkan. Hal ini terbukti dari intensitas puncak difraktogram yang lebih tinggi dibandingkan bare nanopartikel pada posisi hkl yang sesuai untuk Fe3O4. Penambahan PVA juga mempengaruhi nilai faktor g-lande, dimana faktor ini berkorelasi dengan sifat magnetik dari material. Secara umum penambahan PVA dapat menurunkan nilai faktor g-lande, namun material masih tetap memiliki rekativitas terhadap medan magnet eksternal.
Preparation of Chitosan-Fe3O4 Nanoparticles by Ex-Situ Co-Precipitation Using Tripolyphosphate / Sulfate as Crosslinker and Characterization Using XRD Ika Oktavia Wulandari; Akhmad Sabarudin; Djoko Herry Santjojo
Natural B, Journal of Health and Environmental Sciences Vol 3, No 3 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.855 KB) | DOI: 10.21776/ub.natural-b.2016.003.03.01

Abstract

Magnetic nanoparticles of Fe3O4 was synthesized in this research by using ex-situ copresipitation method followed by surface modification with crosslinked chitosan along with trypolyphospate (TPP) and sulfate crosslinking agents. The Fe3O4 materials were formed from FeCl2.H2O and FeCl3.6H2O with 1:2 ratio under alkaline condition. Surface modification processes were conducted by mixing chitosan solution with purified Fe3O4 yielding a ferrogel solution as a product. Here, the crosslinker agents, TPP and sulfate, were added to the mixture to make a crosslinking compounds. In these processes, the chitosan-Fe3O4 crystallite size were affected by composition ratio and crosslinking time which will be proven by using x-ray diffraction (XRD) and modified Debye-Scherrer methods. The results showed that, on highest ratios between chitosan and Fe3O4 as well as TPP/sulfate crosslinker, gave the smallest size of crystallite of chitosan-Fe3O4. Furthermore, the more time of crosslinking process caused crystallite size of chitosan-Fe3O4 became much smaller. 
Photocatalytic Degradation of Methylene Blue Using TiO2-Natural Zeolite as A Photocatalyst Sri Wardhani; Moh. Farid Rahman; Danar Purwonugroho; Rachmat Triandi Tjahjanto; Christiana Adi Damayanti; Ika Oktavia Wulandari
The Journal of Pure and Applied Chemistry Research Vol 5, No 1 (2016)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (974.812 KB) | DOI: 10.21776/ub.jpacr.2016.005.01.232

Abstract

TiO2 - zeolite photocatalyst has been prepared by impregnation of TiO2 onto acid -activated natural zeolite. The XRD data confirmed that natural zeolite used in this work is predominated with mordenite and clinoplitolite types, whereas anatase type can be attributed to TiO2. The highest performance of TiO2 – zeolite, which is indicated by surface area of 13.304 m2/g and band gap energy of 3.15 eV, is obtained when 10 mmol of TiO2 is impregnated onto the zeolite. The ability of this photocatalyst is evaluated by examining degradation of methylene blue (MB) in the presence of UV source. The effects of MB concentration, pH and UV irradiation time on the degradation are studied in a batch reactor. It is interesting since the addition of H2O2 can improve the degradation effeciency of MB. The optimum result is achieved at pH 11, duration of UV irradiation of 50 min, showing degradation amount of 98.25 %. Surprisingly, the chemical oxygen demand (COD) in the degraded MB aqueous solution can be reduced about 77.9%, exhibiting the improvement of water quality. No loss of the activity of the degradation efficiency after reusability of this TiO2 - zeolite photocatalyst for at least 4 times.
PENCEGAHAN DEMAM BERDARAH MENGGUNAKAN LILIN ANTI NYAMUK Stevin Carolius Angga; Erwin Prasetya Toepak; Desimaria Panjaitan; Ika Oktavia Wulandari; Agus Lasono; Sari Namarito Simamarta; Sudarman Rahman
LOGISTA - Jurnal Ilmiah Pengabdian kepada Masyarakat Vol 5 No 2 (2021)
Publisher : Department of Agricultural Product Technology, Faculty of Agricultural Technology, Universitas Andalas Kampus Limau Manis - Padang, Sumatera Barat Indonesia-25163

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/logista.5.2.82-86.2021

Abstract

Penyakit demam berdarah merupakan masalah kesehatan masyarakat di Indonesia terutama pada musim penghujan. Penyakit ini ditularkan oleh virus dengue melalui nyamuk Aedes aegypti. Provinsi Kalimantan tengah menempati urutan tiga besar dalam angka penyakit demam berdarah. Salah satu penangangan yang dapat dilakukan untuk melakukan pencegahan demam berdarah adalah dengan memanfaatkan bahan alam yaitu ekstrak dari serai (Cymbopogon citratus) atau serai wangi (Cymbopogon nardus). Pada umumnya serai digunakan sebagai bumbu dapur, sementara serai wangi tidak terlalu dimanfaatkan. Memperhatikan hal-hal tersebut, maka pembuatan lilin anti nyamuk dari ekstrak serai wangi dapat menjadi salah satu solusi dalam mengatasi penyakit demam berdarah dan pengetahuan ini patut disosialisasikan kepada masyarakat. Metode yang digunakan dalam sosialisasi ini berupa ceramah dan pembagian sampel lilin anti nyamuk. Sementara materi ceramah yang disosialisasikan adalah tentang bahaya penyakit demam berdarah, pencegahannya, pemanfaatan serai wangi sebagai alternatif pencegahan demam berdarah dalam bentuk lilin, teknik pembuatan lilin anti nyamuk. Kegiatan ini diharapkan dapat membantu pemerintah dan masyarakat desa Tumbang Nusa Kabupaten Pulang Pisau dalam penanganan penyakit demam berdarah. Selain itu, kegiatan ini diharapkan dapat meningkatkan kesadaran masyarakat tentang kesehatan dalam mencegah penyakit deman berdarah. Kata kunci: sosialisasi, demam berdarah, serai wangi, lilin anti nyamuk, minyak atsiri ABSTRACT Dengue fever disease is a public health problem in Indonesia, especially during the rainy season. This disease is transmitted by the dengue virus through Aedes aegypti mosquito. Central Kalimantan is the top three in terms of dengue fever disease. Meanwhile, there are Kalimantan natural products which can be used as repellent to prevent the mosquito, such as extracts from lemongrass (Cymbopogon citratus) or citronella grass (Cymbopogon nardus). Mostly lemongrass is used as a kitchen spice, while citronella grass is not very used generally. Furthermore, the utilization of mosquito repellent candles from citronella extract could be a solution to overcome dengue fever disesase. The method used in this socialization is in the form of lectures and distribution of mosquito repellent candle samples. While the lecture material that was socialized was about the dangers of dengue fever, its prevention, the use of citronella grass as an alternative to dengue fever prevention in the form of candles, and preparation of mosquito repellent candles. This socialization is expected to supports the government and the community of Tumbang Nusa village, Pulang Pisau Regency to overcome the dengue fever disease. In addition, this activity is expected to increase public awareness about health in preventing dengue fever. Keywords: socialization, dengue fever, citronella grass, mosquito repellent candle, essential oil
Non-enzymatic Determination of Glucose in Artificial Urine Using 3D-µPADs through Silver Nanoparticles Formation Fahmi, Ahmad Luthfi; 'Aisy, Kamila Rohadatul; Wulandari, Ika Oktavia; Sulistyarti, Hermin; Sabarudin, Akhmad
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.95588

Abstract

Patients with diabetes often experience blood glucose fluctuations, making monitoring crucial. Traditional blood sampling methods pose risks of infection and pain. An alternative non-invasive approach using urine tests has been explored. Recent studies highlight microfluidic paper-based analytical devices (µPADs) as convenient, simple, and easily fabricated tools for non-invasive glucose measurement. This study aims to develop a concept of measuring glucose in artificial urine using 3D-µPADs in a non-enzymatic manner by utilizing glucose as a reducing agent for silver nanoparticle (AgNPs) formation. Embedding three-dimensional connectors in µPADs links the sample and detection zones to limit reagent mixing and improve glucose detection resolution. The optimal conditions were NaOH 10 M, starch 1%, and AgNO3 30 mM, with sample and detection zone volumes of 10 and 9 µL, respectively. The fifth reaction sequence involved AgNO3 in the detection zone and a solution of glucose, NaOH, and starch in the sample zone at 1:1:1 volume ratio. The reagent drying time was 15 min, with immobilization once and reaction time of 9 min. The method showed excellent linearity (R2 = 0.9905), precision (%RSD = 4.27%), accuracy (77.32–92.58%), and limit of detection (11.11 mg/dL).
Non-Enzymatic Detection of Glucose and Ketones in Urine using Paper-Based Analytical Devices 'Aisy, Kamila Rohadatul; Fahmi, Ahmad Luthfi; Sulistyarti, Hermin; Wulandari, Ika Oktavia; Sabarudin, Akhmad
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i2.87294

Abstract

Diabetes, driven by unbalanced diets and unhealthy lifestyles, is highly prevalent. In Indonesia, its prevalence is projected to reach 28.6 million by 2045. Microfluidic paper-based analytical devices (μPADs) are paper-based analytical tools that use hydrophilic paper for measurement and hydrophobic barriers to control fluid flow. This research aims to develop a non-enzymatic method for detecting glucose and ketones in artificial urine using S2Z-μPADs. The fabrication of S2Z-μPADs involves printing the design on Whatman No. 1 paper using wax printing and applying silver nanoparticles for glucose detection and the Schiff base reaction for ketone detection. The results show that the optimum condition for glucose detection is achieved with an AgNO3 concentration of 500 mM. A NaOH concentration of 10 M. Acetoacetate detection is optimized with a glycine concentration of 1 M, sodium nitroprusside concentration of 15%, NaOH concentration of 1 M, a drying time of 8 minutes, and a reaction time of 10 minutes. Validation results demonstrate good linearity for glucose (R² = 0.9821) and ketones (R² = 0.995). High precision was achieved with relative standard deviation (RSD) values of 3.792% for glucose and 1.482% for ketones. The obtained limits of detection (LOD) and limits of quantification (LOQ) indicate that the developed S2Z-μPADs can differentiate between each category of diabetes. The accuracy of glucose and ketone detection ranges from 87.463% to 97.374%. The high accuracy of the μPADs highlights their potential for reliable diabetes management and effective disease monitoring.
Preparasi Kolom Instalasi Pemurnian Biogas dalam Penentuan Kapasitas Serap Adsorben Arang Aktif dan Zeolit di Kecamatan Jabung Wulandari, Ika Oktavia; Indahyanti, Ellya; Kamulyan, Budi
JRCE (Journal of Research on Community Engagement) Vol 4, No 2 (2023): Journal of Research on Community Engagement
Publisher : Universitas Islam Negeri Maulana Malik Ibrahim Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/jrce.v4i2.17915

Abstract

Biogas is one of the alternative renewable energy sources that are useful in our lives. Kecamatan Jabung located in Malang, has the potential to produce and develop this kind of energy resources. However, biogas contains many impurities such as H2O, CO2, and H2S that could have a negative impact. Therefore, it is necessary to purify the biogas by making an installation column. The purification process is carried out by utilizing solid adsorbents including zeolite and activated charcoal. However, because solid adsorbents have a certain capacity, an integrated indicator to determine the adsorbent capacity will be needed. The existence of this indicator will be helpful for the public to monitor whether the adsorbent needs to be regenerated or replaced. According to the trial result, we may conclude that silica gel is a promising indicator to determine H2O and H2S adsorption capacity. Meanwhile, lime water can also be used as an indicator of the adsorption capacity of CO2.
Co-Authors 'Aisy, Kamila Rohadatul Agus Lasono Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Budi Kamulyan Christiana Adi Damayanti D. J. Djoko Herry Santjojo Danar Purwonugroho Desimaria Panjaitan Ellya Indahyanti Erwin Prasetya Toepak Fahmi, Ahmad Luthfi Hermin Sulistyarti Imam Riva’i Lale B Rahayu Mohammad Farid Rahman Purwonugroho, Danar Rachmat Triandi Tjahjanto Rahayu, Lale Budi Hutami Rahman, Sudarman Santjojo, Djoko Harry Sari Namarito Simamarta Sri Wardhani Stevin Carolius Angga ‘Aisy, Kamila Rohadatul