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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Alchemy : Journal of Chemistry IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) INDONESIAN JOURNAL OF APPLIED PHYSICS ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Bulletin of Chemical Reaction Engineering & Catalysis Borneo Journal of Pharmacy Journal Serambi Engineering (JSE)

Sri Mulijani

Department Of Chemistry, FMIPA, IPB University Jalan Tanjung Kampus IPB, Dramaga, Babakan, Dramaga, Bogor, Jawa Barat, 16680, Indonesia

Author-ID : 324381

Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics

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PENENTUAN DAYA SERAP DAN KARAKTERISASI PARAFIN DALAM PERLAKUAN PENJERAPAN MINYAK JELANTAH. Neneng Siti Aminah; Sri Mulijani; Sudirman Sudirman; Ridwan Ridwan
Jurnal Sains Materi Indonesia Vol 5, No 3: JUNI 2004
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PENENTUAN DAYA SERAP DAN KARAKTERISASI PARAFIN DALAM PERLAKUAN PENJERAPAN MINYAK JELANTAH. Kerusakan minyak karena penggorengan berulang selain menyebabkan penurunan mutu dan nilai gizi minyak dan makanan gorengan,juga dapat membahayakan kesehatan. Berbagai gejala keracunan dan karsinogenik dijumpai pada hewan percobaaan yang diberi makan minyak yang rusak karena pemanasan. Mengingat hal tersebut di atas, pada penelitian ini beberapa bahan seperti lilin dan parafin dicoba digunakan untuk menjerap minyakjelantah menjadi bentuk padat. Dalam bentuk padat, minyak dapat dengan mudah dibuang. Minyak jelantah dipanaskan, setelah itu sebanyak 2 g sampel (standar, lilin, dan parafin) dimasukkan sambil terus diaduk lalu dibiarkan sampai dingin dan mengeras. Proses di atas masing- masing dilakukan triplo. Karakterisasi spektroskopi infra merah, difraksi sinar—X serta differential scanning calorimetry dilakukan pada standar dan sampel sebelum dan sesudah perlakuan pada kondisi optimum. Berdasarkan hasil penentuan daya serap, keduajenis lilin yang digunakan tidak mampu menjerap minyak, sedangkan parafin mampu menjerap dengan nisbah 2 g untuk 40 mL minyakjelantah. Nisbah tersebut masih di bawah kemampuan standar yang menjerap 66,67 mL minyakjelantah dengan 2 g standar. Kurangnya kemampuan parafin ini disebabkan adanya perbedaan sifat fisik dari kedua bahan tersebut yang lebih lanjut dijelaskan dari hasil analisis FT-lR, XRD dan DSC. Dari hasil analisis FT-IR, standar terdiri atas gugus hidrokarbon jenuh (alkana) sedangkan paraﬁn merupakan gugus hidrokarbon tidak jenuh (alkena). Spektrum FT-IR setelah perlakuan menunjukkan perubahan, di mana gugus O-H dan ester terbentuk sebagai ciri telah terjadinya penjerapan. Hasil analisis differential scanning calorimetry menunjukkan bahwa standar memiliki titik lebur 75,3°C sedangkan parafin 54,17°C. Untuk analisis difraksi sinar-X menunjukkan bahwa standar dan parafin sebelum perlakuan berbentuk kristalin sedangkan setelah perlakuan berbentuk amorf.

PENGARUH PERLAKUAN PANAS TERHADAP KETAHANAN KOROSI BATAS BUTIR BAJA TAHAN KARAT TIPE 316 Maman K Ajiriyanto; Djoko Kisworo; Rohmatulloh Nabhani; Sri Mulijani
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 14, No 3 (2008): Juli 2008
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2008.14.3.2581

ABSTRAK PENGARUH PERLAKUAN PANAS TERHADAP KETAHANAN KOROSI BATAS BUTIR BAJA TAHAN KARAT TIPE 316. Dalam industri nuklir, baja tahan karat, paduan alumunium dan zirkaloy digunakan sebagai komponen pendukung reaktor riset atau daya dalam bentuk tangki bertekanan, pipa, kelongsong, dan bahan struktur. Baja tahan karat tipe 316 dan 316L digunakan sebagai kelongsong bahan bakar reaktor LMFBR dimana temperatur operasinya bisa mencapai sekitar 500oC. Pada suhu tinggi jenis baja ini akan mengalami sensitasi. Ketahanan sensitasi ini akan ditentukan menggunakan alat Potensiostat dengan metode uji potensiodinamik dan pengamatan permukaan hasil uji korosi dengan alat SEM. Tujuan dari penelitian ini adalah untuk menganalisa pengaruh perlakuan panas terhadap ketahanan korosi terutama terhadap serangan kondisi batas butir. Bahan SS 316 yang telah dilaku panas normalizing pada suhu 550 dan 650 dan solution treatment pada suhu 350, 450, 550 dan 65 oC diuji korosi menggunakan alat potentiostat. Dari uji korosi dihasilkan bahwa laju korosi meningkat dengan meningkatnya suhu perlakuan panas baik proses normalizing maupun solution treatment. Laju korosi sampel yang dilaku panas pada suhu 550 dan 650 oC tanpa solution treatment menghasilkan laju korosi lebih besar dibanding dengan proses solution treatment, dengan perbedaan laju korosi sebesar 35,82 mpy untuk suhu 550 oC dan 24,97 mpy untuk suhu 650 oC. Hasil pengamatan morfologi permukaan memperlihatkan adanya korosi batas butir pada rentang suhu 550 – 650, sedangkan untuk rentang suhu 350 – 450 tidak menunjukkan terjadinya korosi batas butir. Kata Kunci : korosi batas butir, baja tahan karat austenitik, sensitasi ABSTRACT Heat Treatment fluence to intergrannular corrosion succeptibility of stainless steel type 316. Stainless steel was used in nuclear industry as cladding of Liquid Metal Fast Breeder Reactor (LMFBR), which operation temperature above 500 0C. According to the theory, resistance of stainless steel type 316 is good enough, but in the high temperature tend to influence by intergranular corrosion. The sensitization degree of Stainless Steel type 316 ( SS 316 ) was calculated by potentiostat using potentiodynamic method, and was observed by scanning electron microscope ( SEM ). The objective of this research was to analized the effect of heat treatment on corrosion resistance. First, samples were heat treated at 1,000°C for 3 hours and then were quenched in the water for 30 minutes. Samples were heat treated for 6 hours on the temperature : 350, 450, 550, and 650°C. The heat treated samples were corrosion tested by Potensiostat model M 273 with Potensiodynamic method. The surface of samples were observed by SEM. Three kinds of SS 316 samples : blank, solution treatment, and ageing for 650oC were characterized by x–ray diffractometer. The result showed that the corrosion rates increased with the increasing temperature. The corrosion rate of samples heat treated at 550 and 650°C were 105,9 and 118.37 mpy, the samples were heat treated at 350 and 450 °C after solution treatment did not exhibit intergranular, corrosion rate respectively were 89,39 and 91,06 mpy. The corrosion rates of samples that were heat treated at 550°C and 650°C without solution treatment, revealed were higher than with solution treatment. Keywords : intergranular corrosion, austenitic stainless steel, sensitization

Improvement of PVA-Glucomanan-Acrylamide Hydrogel as Base Material of Immobilization Repita Sari; Sri Mulijani; Meri Suhartini
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 8, No. 1, May 2022
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v8i1.20332

Hydrogel products are currently widely used in various fields, one of which is agriculture. Most hydrogels are made of synthetic polymers because they have good absorption but are not biodegradable. Glucomannan is a natural polymer that is able to absorb large amounts of water and biodegradable but it is difficult to maintain water content. One method to improve the mechanical properties of hydrogels is by modifying the hydrogels through the formation of an interpenetrating network (IPN) between natural polymers and synthetic polymers. In this study, the IPN hydrogel based on polyvinyl alcohol and glucomannan and acrylamide as a crosslinker was made by combining freeze-thaw and gamma irradiation techniques. The results showed that the hydrogel water absorption after immersion for 24 hours was 311.09% where the weight of glucomannan was 1 g and acrylamide was 0.75 g and the irradiation dose was 30 kGy. The result of cumulative release test of paraquat immobilized into the hydrogel was 12.00% within 10 days. This indicates that the PVA-glucomannan-acrylamide hydrogel can be used as a controlled paraquat release matrix so as to minimize the effect on the overuse of pesticides.

Synthesis of Superabsorbent Polymer based Glucomanan-Polyacrylate by Gamma Irradiation Sri Mulijani; Sri Sugiarti; Erizal Erizal; Qory Hajrul Fajriani
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 4, No 3 (2019): October 2019
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v4.i3.104

Materials with potential of fast absorption of water or liquid have emerged as very interesting objects for researches. Superabsorbent polymer is a cross linked polymer which has ability to absorb water hundreds to thousands of times the dry weight because it has hydrophilic groups. Owing to this characteristic this polymer gets attention for many applications, one of these is diapers. Superabsorbent polymer was synthesized from the mixture of glucomannan-pottasium acrylic-acrylamide solution by irradiation crosslinking with doses irradiation 10 kGy. It was found that SAP showed super swelling properties in water (880 g/g) at short time (15 minutes) and in real urine has a good swelling 110 g/g. Acrylamide was able to increase the swelling ratio in real urine. Therefore, it can be candidate as thin diapers with high sorption. The result of FTIR spectra confirmed that the crosslinkingoccurs in the hydrogels and SEM images of hydrogels showed large numbers of pores from SEM examinationKeywords: Superabsorbent polymer; Acrylic acid; Acrylamide; Glucomannan; Irradiation

Inhibition Kinetics of Sida rhombifolia L. Extract Toward Xanthine Oxidase by Electrochemical Method Dyah Iswantini; Muammar Yulian; Sri Mulijani; Trivadila Trivadila
Indonesian Journal of Chemistry Vol 14, No 1 (2014)
Publisher : Universitas Gadjah Mada

Sida rhombifolia L. is a traditional medicinal plant that has been known with potential as antigout. The previous research suggested that flavonoids crude extract of S. rhombifolia had an inhibitory activity toward xanthine oxidase by 71% and a spectrophotometric measurement showed that the type of flavonoids crude extract inhibition was a competitive inhibition. The purpose of the research was to investigate the type of inhibition kinetic of S. Rhombifolia’s ethanol extract by electrochemical method and to compare the measurements of linearity and sensitivity between spectrophotometric and electrochemical methods. The results showed that the yield of S. Rhombifolia’s ethanol extract was 9.82% with the inhibitory activity ranging from 13.64% to 82.69% (5.00-200 mg L-1) and IC50 value was 91.15±5.74 mg L-1. Allopurinol as a control showed the inhibitory activity of 15.26-70.95% (0.10-4.00 mg L-1) and IC50 value was 2.45±2.21 mg L-1. Inhibition kinetics of the ethanol extract caused a KM increase and unchange of VMAX. Based on the data, the type of inhibition kinetics was a competitive inhibition, with an inhibitor affinity (α) value of 3.18. Linearity of xanthine oxidase activity assay by electrochemical and spectrophotometric methods showed the range of 0.01-1.00 mM (R2 = 0.978) and 0.05-0.70 mM (R2 = 0.977) respectively. The sensitivity of electrochemical method was reported higher (0.95 μA mM-1) than the spectrophotometric method (0.007 min-1).

Anti-inflammatory and Immunostimulant Therapy with Lactobacillus fermentum and Lactobacillus plantarum in COVID-19: A Literature Review Harry Noviardi; Dyah Iswantini; Sri Mulijani; Setyanto Tri Wahyudi; Tatik Khusniati
Borneo Journal of Pharmacy Vol. 5 No. 3 (2022): Borneo Journal of Pharmacy
Publisher : Institute for Research and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/bjop.v5i3.3367

Inflammatory diseases are diseases characterized by inflammatory symptoms. Acute inflammatory disease can cause dysregulation of the inflammatory immune response, thereby inhibiting the development of protective immunity against infection. Among the acute inflammatory disease is COVID-19. The initial viral infection causes the antigen-presenting cells to detect the virus through a phagocytosis mechanism in the form of macrophage and dendritic cells. Lactobacillus fermentum and L. plantarum are gram-positive bacteria potentially serving as immunomodulators caused by inflammation and immune system response. Short-chain fatty acids (SCFA) produced by Lactobacillus can induce immune response through tolerogenic dendritic cells. This probiotic bacterium can induce the production of different cytokines or chemokines. Following the results of in vitro and in vivo tests, L. fermentum and L. plantarum can induce IL-10 release to activate regulatory T-cell and inhibit tumor necrosis factor-α (TNF-α) binding activity of nuclear factor kappa B (NF-κB). Literature review showed that dysregulation of inflammatory immune response disorders due to inflammatory disease could be treated using probiotic bacteria L. fermentum and L. plantarum. Therefore, it is necessary to conduct further studies on the potential of indigenous Indonesian strains of these two bacteria as anti-inflammatory and immunostimulants.

Synthesis of Smart Packaging from Cellulose Acetate with The Addition of AgNO3 as An Antibacterial Substance Febryanti, Amalyah; Benu, Marlon; Aferta, Lusi; Siswara, I.M; Mulijani, Sri; Alif, Alfiah
ALCHEMY:Journal of Chemistry Vol 12, No 1 (2024): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v12i1.13019

Synthesis of smart packaging from cellulose acetate with the addition of AgNO3 as an antibacterial substance has been investigated. The purpose of this study is to fabricate smart packaging from cellulose acetate with the addition of AgNO3 as an antibacterial substance. The method used was solution casting. In addition, this study was also characterizing the smart packaging, they included tensile strength and elongation percent test, antibacterial test, morphology analysis using SEM, and biodegradability test. The plastics obtained were clearly yellow, not easily damaged, a little thick, and the smooth surface and slightly bubbly. The largest tensile strength of plastic was 0.0661 MPa, it found in sample No. 2, while the smallest tensile strength was 0.027 MPa, it found in sample No. 1. The greatest elongation value at break was 5% found in sample No. 4, while the smallest elongation value at break was 3.5% in sample No. 3. The result of antibacterial test reported that the freshest mangoes were shown by samples No. 1 and No. 2; while the fast-rotting mangoes were shown in the sample No. 3 and No. 4. The results of the SEM test showed the presence of nano-sized particles that spreaded in the plastic body. The greatest degradability degree were sample No. 4 about 0.0009 g/day with the percentage of mass loss about 17.38%. Futhermore, cellulose acetate can be used as a basic material for making plastics. The addition of AgNO3 in plastic synthesis can help to delay the process of fruit spoilage caused by bacteria.

Potential Utilization of Palm Oil Liquid Waste as Downstream Agroindustry Products with Proximate Test and β-Carotene Concentration Karnadi; Adiarso; Dyah Iswantini; Sri Mulijani
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Since 2006, Indonesia has led global production and export of palm-based edible oils. Government policies focused on advancing agriculture and agro-industries, particularly in downstream product development, provide opportunities to increase the economic value of these products, including palm oil products. Efforts to enhance downstream products include maximizing all palm oil potentials, including its waste. Global CPO production based on 2024 data is 79.6 million tons per year, with Indonesia contributing 59%. The potential waste is also very large, including the final waste which still contains around 20-25% oil and 3-5% phytonutrients. Proximate analysis and β-carotene content studies are used to evaluate the potential of CPO liquid waste for poultry feed. Proximate analysis results show low nutrient levels, including protein (<0.04%), carbohydrates (1.37%), total carbohydrates (<0.02%), total energy (5.20%), and crude fiber (<0.02%), making it unsuitable as a poultry feed substitute. However, based on β-carotene data, the waste can be used as an additive in poultry feed if stored for less than 28 days. The β-carotene degradation process follows zero-order reaction at heating and storage conditions (under room and dark storage).

TiO2/ZnO/CuO/HDTMA-Br Composite for Photodegradation of Oxidative Compounds of Used Cooking Oil (UCO): Photodegradation of Free Fatty Acids and Peroxides Pitaloka, Adinda; Sutriah, Komar; Mulijani, Sri; Khotib, Mohammad
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20554

Used cooking oil (UCO) contains peroxide and FFA, which can impede UCO processing and lower the quality of downstream products. The majority of pretreatment techniques currently in use have drawbacks, such as excessive chemical use. An alternative that is more successful and efficient is photocatalysis. No research has been conducted on the photodegradation of UCO using TiO2/ZnO/CuO/HDTMA-Br composites. Precipitation was used to create the composite. The TiO2/ZnO/CuO composite has a high crystallinity, specifically 74.54% in the 1 CMC-modified catalyst, according to the characterization results. The spectrum of the synthesized TiO2/ZnO/CuO composite showed the presence of H2O and CO2 groups in addition to the primary groups of TiO2, ZnO, and CuO. Additionally, the 1 CMC modification increased pore volume and surface area. The surfactant-modified composite exhibited a more consistent morphology, as observed by SEM analysis. The best results from photocatalytic testing at different temperatures, times, and surfactant concentrations were obtained at 120 °C for an hour with a surfactant concentration of 1 CMC. These results show that degradation using TiO2/ZnO/CuO photocatalysts can lower the FFA and peroxide contents of UCO by 65% and 59%, respectively, under ideal conditions. This study focuses on FFA and peroxide value parameters as a preliminary investigation into alternative UCO pretreatment solutions. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Membrane Electrode Assembly Based on Sulfonated Polysulfone-Activated Zeolite Composite Membrane for Fuel Cell Applications Wulanawati, Armi; Mulijani, Sri; Yulizar, Yoki
Jurnal Kimia Sains dan Aplikasi Vol 29, No 1 (2026): Volume 29 Issue 1 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.1.39-45

The depletion of fuel cell reserves shows the need for alternative energy sources. In this context, fuel cells provide a promising solution, generating power without emissions. The membrane electrode assembly (MEA) in fuel cells is a critical component to maximize combustion efficiency. Therefore, this study aims to develop MEA using a composite membrane based on sulfonated polysulfone-activated zeolite (PSfs-Z). The membrane was obtained by first sulfonating polysulfone (PSf) and then adding activated zeolite. Optimum fuel performance was achieved with the activated zeolite using 3 N HCl. Sulfonation was completed, as demonstrated by a sulfonation degree of 32.63%. The absorption bands of the SO2 group vibration from SO3H of PSfs were identified at a wave number of 1111.00 and 1259.33 cm−1. The successful formation of MEA was confirmed by its morphology, as observed using a scanning electron microscope, with the formation of a catalyst layer and a membrane in the cross-section. The highest proton conductivity and cell potential obtained for PSfs-Z 3 N MEA were 0.01727 S.cm−1 and 330 mV, respectively. This means the membrane electrode assembly based on a sulfonated polysulfone-activated zeolite composite membrane has a higher potential than the

Co-Authors . TRIVADILA Adiarso Aferta, Lusi Alif, Alfiah Armi Wulanawati Benu, Marlon Jusak Rinaldy Djoko Kisworo Dyah Iswantini Erizal Erizal Febryanti, Amalyah Gustini Syahbirin Harry Noviardi Ida Ayu Putu Sri Widnyani Karnadi Komar Sutriah Maman K Ajiriyanto Mega Fatimah Rosana Meri Suhartini Mohammad Khotib Muammar Yulian Neneng Siti Aminah Pitaloka, Adinda Putri, Silvia Devi Eka Qory Hajrul Fajriani Repita Sari Ridwan Ridwan Rohmatulloh Nabhani Setyanto Tri Wahyudi Shabrina Shabrina, Shabrina Siswara, I.M Tatik Khusniati Yoki Yulizar

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