Article Per Year (5 Year)
p-Index From 2020 - 2025
1.152
P-Index
This Author published in this journals
All Journal VALENSI 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 Borneo Journal of Pharmacy Serambi Engineering
Sri Mulijani
Department Of Chemistry, FMIPA, IPB University Jalan Tanjung Kampus IPB, Dramaga, Babakan, Dramaga, Bogor, Jawa Barat, 16680, Indonesia
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics

Published : 10 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 10 Documents
Search

 1 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1149.278 KB) | DOI: 10.17146/jsmi.2004.5.3.5124

Abstract

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

Abstract

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

Abstract

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

Abstract

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
Performance of Doped Montmorillonite on Photosensitizer Based Natural Dyes Gardenia Jasminoides Sri Mulijani; Komar Sutriah; Gustini Syahbirin; Shabrina Shabrina
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.54786

Abstract

Dye Sensitized Solar Cell (DSSC) is an electrochemical cell that is able to convert solar energy from light to electrical energy. This technology is needed by the world as a renewable and environment friendly energy. In this study, we evaluate the consideration of modification montmorillonite and Gardenia jasminoides dyes may achieve better performance of DSSC by manufactured DSSC with modified TiO2 semiconductors using montmorillonite (MMT) and Nafion. Performance of DSSC was determined by potentiometer. Atomic force microscope was used to evaluate the characteristic of DSSC. The UV-vis results revealed that the dyes which is extracted from the Gardenia jasminoides content crocin and quercetin compounds. Modification DSSC contains ratio of MMT: nafion (50:50) exhibited highest power conversion efficiency value of 0.8316%. Topography of surface ensured the dyes have occupied surface area and able to promote electron to higher energy.  However, MMT and nafion capable to enhance potential of dyes as photosensitizer in DSSC. 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.064 KB) | DOI: 10.22146/ijc.21270

Abstract

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).
Facile Synthesis of Composite Chitosan and Durio zibethinus Seed and Its Applications as Adsorbent of Metal Ion Ni(II) Silvia Devi Eka Putri; Sri Mulijani; Komar Sutriah
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.65948.197-209

Abstract

Nickel is one of the most dangerous heavy metals that impact water ecosystems and human health. In the study, natural and harmless composite materials such as biochar and chitosan were modified to build adsorbent composites and form optimal conditions for the adsorption of nickel heavy metal ions from contaminated wastewater. Biochar was prepared from Durio zibethinus seeds by hydrothermal method to form nanopowder. It was treated with acid, while chitosan was designed as nanopowder by hydrothermal method, also without acid treatment. Composite adsorbents were prepared by mixing biochar and chitosan with a ratio of 4:3 (w/w). Fourier Transform Infrared characterizes composite materials as adsorbents, biochar, and chitosan. The surface morphology of the adsorbent was evaluated by scanning electron microscopy. Furthermore, Langmuir, Freundlich, and Temkin isotherms determine the adsorbent's performance. In addition, batch adsorption experiments were carried out to measure the effect of solution pH, adsorbent dosage, and initial concentration of metal ions. Nickel ion adsorption by the composite adsorbent showed an adsorption capacity of 26.69 mg/g, a maximum removal efficiency of 89.39% at optimum conditions of pH 6, an adsorbent dose of 0.5 g, and a contact time of 200 minutes. This adsorption capacity was better than chitosan and durian seed adsorbents. The nickel ion adsorption process by composite adsorbent shows a pattern in the Temkin isotherm model. In contrast, the chitosan and Durio zibethinus seed adsorbents tended to follow the Langmuir and Freundlich isotherm models. In addition, the adsorption kinetics of the composite material showed pseudo-second-order kinetics, and the reaction was exothermic.
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

Abstract

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

Abstract

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

Abstract

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