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All Journal Jurnal Pengolahan Hasil Perikanan Indonesia VALENSI JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Jurnal Penelitian Hasil Hutan Jurnal Riset Kimia IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Indonesian Journal of Chemical Science Science and Technology Indonesia Al-Kimia Jurnal Kartika Kimia Jurnal Penelitian Hasil Hutan JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal Penelitian Hasil Hutan

Tetty Kemala

Departemen Kimia, FMIPA - IPB Kampus IPB Darmaga, Gedung Fakultas Peternakan, Bogor-16680

Author-ID : 297405

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

Published : 27 Documents Claim Missing Document

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Potential for Antibacterial Activity of Chitosan-Polyvinyl Alcohol Membrane Loaded with Green Grass Jelly Leaf and Moringa Leaf Extract as a Wound Dressing Nur Inayatullah; Tetty Kemala; Irma Herawati Suparto
Jurnal Kimia Sains dan Aplikasi Vol 25, No 4 (2022): Volume 25 Issue 4 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Chitosan is a natural polymer that can be used as wound dressing material; however, it has rigid and brittle properties. A combination of chitosan and polyvinyl alcohol (PVA) is expected to allow improvement of chitosan’s mechanical properties. Green grass jelly leaf (Cyclea barbarta M.) and moringa leaf (Moringa oleifera L.) have antibacterial compounds that can be added to the chitosan-PVA composite membrane. The purpose of the research was to develop and characterize the chitosan-PVA composite membrane with the addition of green grass jelly leaf and moringa leaf extracts to enhance the antibacterial activity of the membranes that have potential as a wound dressing. Both extracts with various composition volumes (75:25, 50:50, and 25:75) were tested for antibacterial activities against S. aureus and E. coli. Chitosan-PVA composite membrane with the volume ratios of 5:5, 6:4, and 7:3 was added with extract with the highest antibacterial activity. The composites were characterized for density, water vapor permeability, tensile strength, elongation, Fourier Transform Infrared spectroscopy, and Scanning Electron Microscope. The most significant inhibition zone was shown by an extract ratio of 50:50 against S. aureus and E. coli, 13.00±1.17 mm and 7.00±0.17 mm, respectively. Composite membrane with the addition of extract had a larger inhibition zone against S. aureus (9.75±0.75 mm) and E. coli (7.50±0.65 mm) than without extract. Chitosan-PVA(5:5)+extract membrane showed excellent density and water vapor permeability compared to other membrane ratio compositions. Mechanically, the addition of extract decreased the tensile strength and elongation of the membranes; however, it still complied with the medical material standard criteria. The characterization for functional groups showed that chitosan-PVA+extract generated the N-H group peak with two wavenumbers expressed as overlapping amides with amines and protonated amines. The SEM analysis showed that the addition of extract was not distributed homogeneously on the membrane surface.

Kompatibilitas Nanokristal Selulosa Termodifikasi Setrimonium Klorida (CTAC) dalam Matriks Poliasam Laktat sebagai Material Pengemas Nina Hartati; Tetty Kemala; Komar Sutriah; Obie Farobie
Jurnal Kimia Sains dan Aplikasi Vol 22, No 4 (2019): Volume 22 Issue 4 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Pertumbuhan jumlah penduduk meningkatkan konsumsi plastik nonbiodegradable yang menyebabkan penumpukan sampah. Pengalihan bahan plastik dari yang tidak dapat terurai dengan plastik yang mudah terurai penting dilakukan. PLA merupakan polimer plastik yang mudah terurai namun bersifat rapuh. Limbah industri minyak kelapa sawit yang berupa tandan kosong kelapa sawit memiliki potensi sebagai reinforcement material karena kandungan selulosanya sebesar 30-40%. Perkecilan ukuran menjadi skala nano akan meningkatkan luas permukaan dan kemampuan dispersi selulosa ke dalam matriks PLA, sehingga meningkatkan kompatibilitas ditinjau dari sifat mekanik dan morfologi permukaan pada kompositnya. Hidrolisis asam kuat selulosa dan sentrifugasi pada kecepatan 5000 rpm berhasil mendapatkan nanokristal selulosa dengan persen kristalin sebesar %. Ultrasonikasi nanoselulosa kristalin menghasilkan partikel dengan diameter rerata 7,967 nm. CTAC sebagai agen solubilizer dan pemodifikasi permukaan berhasil membentuk interaksi dengan nanokristal selulosa yang terekam pada bilangan gelombang 2850 cm-1, 2960 cm-1 dan 720 cm-1. Nanokristal selulosa yang dimodifikasi CTAC membentuk komposit CNCs-PLA dengan sifat mekanik yang lebih baik dari PLA murni. Pada jumlah CTAC tetap 0,2 mol, sifat mekanik komposit CNC-PLA terbaik diperoleh pada komposisi rasio 90 : 10 dengan kekuatan tarik 26,295 MPa, perpanjangan putus 68,18%, dan keteguhan tarik 0,387 Gpa. Semakin besar konsentrasi CTAC yang memodifikasi nanokristal selulosa, semakin rendah nilai kekuatan tarik dan perpanjangan putusnya. Hasil karakterisasi morfologi permukaan, menunjukkan adanya degradasi pada permukaan PLA yang menyebabkan penurunan sifat mekanik komposit tersebut.

Synthesis and Characterization of Corn Husk (Zea Mays L.) Cellulose Using Microwave-Assisted Extraction (MAE) Nor Pana Yupa; Henny Purwaningsih; Tetty Kemala
Jurnal Kimia Sains dan Aplikasi Vol 26, No 7 (2023): Volume 26 Issue 7 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.7.268-275

This research focuses on synthesizing cellulose from corn husks using microwave-assisted extraction (MAE), which aims to produce cellulose from corn husks through liquefaction, delignification, and bleaching processes. The total time required is only 14 minutes, thus shortening the process time. This study used three power variations: 450 W, 600 W, and 800 W. The results showed that the optimum conditions occurred at 800 W power. Hence, the higher the power caused the high cellulose content obtained, which amounted to 75.23% and decreased the lignin value to 15.78%, along with the increase in microwave power. FTIR analysis also confirmed the cellulose results obtained and indicated that the lignin groups were weakened or lost. Furthermore, morphological analysis of cellulose fibers by SEM showed that the surface of cellulose fibers was rough, oval, and irregular due to cracks caused by erosion. Then, the result of cellulose crystallinity using XRD was 45.8%. Compared to conventional methods, microwave-assisted cellulose synthesis exhibits better and more promising potential. This is because microwave radiation can be used to improve process time efficiency and achieve higher yields. Moreover, the proposed method is easier, faster, and straightforward.

Impact of Modifying Filler into Porous on Hydrophobicity Behaviour of The Silica-HDPE Composite Defrizal, Muhammad; Kemala, Tetty; Khotib, Mohammad
Jurnal Kimia Sains dan Aplikasi Vol 28, No 4 (2025): Volume 28 Issue 4 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.4.168-175

Even though the approach is relatively simple and does not require additional treatment, the porous filler method has not been widely utilized to boost the composite’s hydrophobicity. Therefore, this study wants to show that silica’s porosity as a filler material affects the surface roughness and hydrophobicity of its composite (in this case, silica-HDPE). Pore formation in silica uses the soft-template method with Tween-80 as the mould. The amount of surfactant was varied by 0, 5, and 10 g. The particles are then physically composited into the HDPE matrix. Surface characterization of silica particles analyzed by Brunauer-Emmett-Teller (BET) shows enhancement in particle porosity as the amount of surfactant added is increased. When it is inserted into HDPE, the silica particles with the highest porosity have the greatest surface roughness. It is confirmed by the wavy surface texture of this composite when it is characterized using an Atomic Force Microscope (AFM). These results are accompanied by a significant enhancement in the contact angle value at each concentration. From the contact angle and AFM data, porous silica has the role of surface texture provider in raising its roughness. It affects the improvement of the hydrophobicity according to the Cassie-Baxter equation, which states that the more air fraction formed on a surface, the higher the contact angle obtained.

Development of Bioplastic Films from Cassava Peel Starch Reinforced with Banana Midrib Nanocellulose and the Effect of Sorbitol on Mechanical Strength Albarkah, Anita Maharani; Soebrata, Betty Marita; Kemala, Tetty
Jurnal Kimia Sains dan Aplikasi Vol 28, No 8 (2025): Volume 28 Issue 8 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.8.426-435

Cassava peel and banana midrib, two abundant agricultural wastes, were utilized as sources of starch and cellulose to develop environmentally friendly bioplastic films. Cellulose was isolated through delignification and bleaching, followed by ultrasonication to produce nanocellulose. The obtained nanocellulose was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and a Particle Size Analyzer (PSA), which confirmed distinct cellulose functional groups, a crystallinity index of 58.7%, and an average particle size of 326.44 nm. Bioplastic films were prepared by blending cassava peel starch with banana midrib nanocellulose and varying concentrations of sorbitol as a plasticizer. The incorporation of nanocellulose increased thickness, density, and tensile strength, while reducing water absorption and water vapor transmission rate (WVTR), likely due to the reinforcing effect of nanocellulose within the polymer matrix. The addition of sorbitol at different concentrations influenced the mechanical properties of the bioplastics, with the composition containing 0.89 g sorbitol exhibiting favorable tensile strength and elongation. The optimal formulation consisted of 2.85 g cassava peel starch, 0.15 g nanocellulose, and 0.89 g sorbitol, yielding a tensile strength of 2.76 MPa and an elongation of 11.19%. These findings demonstrate that incorporating sorbitol and nanocellulose significantly enhances the performance of starch-based bioplastics, highlighting their potential application in sustainable packaging materials.

Co-Authors Achmad Sjahriza Adi Cifriadi Adi Cifriadi, Adi Afra Najiyah Amatullah Agus Malik Ibrahim Ahmad Sjahriza Aisy, Laaili Azti Rohaadatul Albarkah, Anita Maharani Aloma Karo Karo Amatullah, Afra Najiyah Andi Nursanti Anjarsari Anjarsari Ardiati, Fenny Clara Armi Wulanawati Asron Ferdian Falaah, Asron Ferdian Bakar, N.H.H Abu Budi Arifin Charlena Dede Heri Yuli YANTO Deden Saprudin Defrizal, Muhammad Finaldin, Muhammad Alhas Gustan Pari Gustan Pari Harahap, Muslim Arfanshah Hendra Adijuwana Henny Purwaningsih Ibrahim, Agus Malik Iqbal, Anwar Irma Herawati Suparto Karim, Wouda Fiorendita Kiagus Dahlan Komar Sutriah M. Syaeful Fahmi Mardiana Hardianti Mohammad Khotib Nada, Nida Kotrun Naser, Inda Hastuti N Nina Hartati Nor Pana Yupa Noviyan Darmawan Nur Inayatullah Nurhayat, Oktan Dwi Obie Farobie Permana, Ifri Surya Pipih Suptijah Prakoso, Mochamad Galih Purwantiningsih Sugita Purwantiningsih Sugita Ravena Ravena Santi Puspitasari Siti Komariah Siti Nikmatin Sitompul, Dina Wardani Soebrata, Betty Marita Sudirman Sudirman Suminar S. Achmadi Suryanegara, Lisman Susi Nurdayat Tun Tedja Irawadi Tun Tedja Irawadi

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