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Rondang Tambun
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Jurnal Teknik Kimia USU
Published by TALENTA PUBLISHER
ISSN : -     EISSN : 23374888     DOI : https://doi.org/10.32734/jtk.v11i1
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Jurnal Teknik Kimia USU merupakan jurnal elektronik yang mempublikasikan karya ilmiah di bidang teknik kimia yang diterbitkan oleh Departemen Teknik Kimia, Fakultas Teknik, Universitas Sumatera Utara. Jurnal ini tidak terbatas pada mahasiswa dan dosen Universitas Sumatera Utara, tetapi terbuka untuk mahasiswa, dosen dan peneliti dari instansi lain.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 355 Documents
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Pengaruh Metode Ko-Inokulasi Bakteri Asam Laktat dan Yeast terhadap Karakterisasi dan Atribut Aroma Tuak Berlian Simanjuntak; Theodora M Putri; Rachel Sinaga; Michael Sipayung
Jurnal Teknik Kimia USU Vol. 15 No. 2 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i2.25740

Abstract

In previous research, the Friedman test on the aroma of tuak with the addition of suspected as Lactic Acid Bacteria (LAB), yeast, and a consortium showed no significant difference among the samples. However, tuak with suspected as LAB was preferred by the panelists. Due to the panelists inability to determine specific aromas, this study was conducted to identify the specific aroma attributes from the fermentation of palm sap. Following this, a multiple comparison test and a hedonic test were performed to determine if the coinoculation technique improves the aroma quality of tuak. The results of the descriptive test were consistent with the ANOVA test results, showing that the aroma of tuak with co-inoculation differed from tuak without co-inoculation. Tuak with co-inoculation detected the aroma like ethyl lactate, while tuak without co-inoculation had an aroma like lactic acid. In the multiple comparison test, the aroma of co-inoculated tuak was better with a moderate level of difference. The hedonic test showed that panelists preferred the aroma of co-inoculated tuak, specifically with a yeast to suspected as LAB ratio of 1:2. The alcohol levels of the tuak under these conditions were 0.94% ± 0.06 with pH 3.95 ± 0.03.
Produksi Bio-oil dari Co-pyrolysis Pelepah Kelapa Sawit dan Plastik Polyethylene Terephthalate Menggunakan Katalis Fly Ash Batu Bara Nadya Cahaya Putri; Suci Rahmadini; Nurfatihayati Nurfatihayati; Sunarno Sunarno; Panca Setia Utama; Anisa Mutamima
Jurnal Teknik Kimia USU Vol. 15 No. 2 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i2.26026

Abstract

This study investigates bio-oil production via the co-pyrolysis of oil palm fronds (OPF) and polyethylene terephthalate (PET) plastics using a coal fly ash catalyst. The process was conducted in a fixed-bed reactor at 350°C for 60 minutes. Results showed that an optimum OPF to PET ratio of 75:25 yielded 20.48% bio-oil. The addition of 10% fly ash maximized the yield to 27.04%, whereas a 15% catalyst concentration triggered over-cracking reactions, thereby decreasing the yield. Conversely, the highest heating value of 31.46 MJ/kg (meeting the ASTM D7544-12 standard) was achieved at the 15% catalyst concentration. This highlights a trade-off between the optimum conditions for bio-oil quantity (10% catalyst) and quality (15% catalyst). GC-MS analysis confirmed the dominance of phenolic compounds, furans, and carboxylic acids, affirming the potential of this mixture as a renewable energy alternative.
Pengaruh Variasi Konsentrasi Minyak Atsiri Kamomil dan Lavender terhadap Karakteristik Fisik dan Stabilitas Produk Multipurpose Balm Annisa Yumna N. Firdaus; Firna Yuliani; Venitalitya A. S. Augustia
Jurnal Teknik Kimia USU Vol. 15 No. 2 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i2.26224

Abstract

Growing interest in natural cosmetics has encouraged the development of multipurpose balms containing Lavender Essential Oil (LEO) and Chamomile Essential Oil (CEO). This study investigated the effects of varying LEO and CEO concentrations on the physicochemical characteristics and stability of multipurpose balm formulations. Researchers prepared nine samples with different essential oil concentrations and evaluated organoleptic properties, spread ability, pH, Fourier Transform Infrared (FTIR) spectroscopy, and total plate count (TPC). The results showed stable semisolid textures, with colour and aroma varying with essential oil concentration. Sample 5 received the highest consumer preference. The pH values ranged from 4.96 to 5.21, within the physiological skin pH range of 4.5–6.5. Spread ability increased with applied load, reaching 2.175 cm in sample 9. FTIR analysis indicated no chemical structural changes, while TPC values of ≤ 10 CFU/g met cosmetic microbiological safety standards. Overall, the balm formulations remained stable and safe across the tested LEO and CEO variations.  
Optimasi Ekstraksi Alginat dari Sargassum polycystum Menggunakan Sistem Cairan Dua Fase Berbantukan Gelombang Ultrasonik Berdasarkan Response Surface Methodology dan Pemodelan Kinetika Difusi Erica Wijaya; Effendi Utomo; Meta F Rizkiana; Yukti Nurani; Boy Fachri
Jurnal Teknik Kimia USU Vol. 15 No. 2 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i2.26295

Abstract

Sargassum polycystum has the potential to be a source of alginate for the food and pharmaceutical industries. This study aimed to optimise alginate extraction using an ultrasound-assisted aqueous two-phase system and model the extraction kinetics based on Fick's diffusion law. Extraction was conducted using 2-propanol and K₂HPO₄, with variations in extraction time, ultrasonic power, and solid-to-solvent ratio. Optimisation was performed using response surface methodology with Box-Behnken design. FT-IR and HPLC analyses confirmed the isolation of alginate. The actual alginate yield of 81.37% was achieved at a solid-to-solvent ratio of 0.04 g/mL, an extraction time of 20 min, and an ultrasonic power of 60% (390 Watts). The optimisation results predicted an alginate yield of 82.244%, with an R² value of 0.9960 for the RSM–Box–Behnken model. The experimental yield obtained from model validation was 81.93%, with a relative prediction error of 0.38%.   The kinetic model based on Fick's diffusion law yielded a De of 1.619×10-11 and an SSE of 0.006673, indicating excellent agreement between the model predictions and the experimental data.
Pengaruh Penambahan Selulosa Pelepah Sawit dan Konsentrasi Gliserol dalam Pembuatan Bioplastik dari Pati Singkong Mochamad Mizan Yusridarmawan; Maria Ulfah; Reza Widyasaputra
Jurnal Teknik Kimia USU Vol. 15 No. 2 (2026): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v15i2.26803

Abstract

Bioplastics are one of the alternatives to conventional plastic that is more environmentally friendly because they can be degraded naturally with the help of microorganisms. This study aims to determine the effect of the addition of cellulose in palm fronds and glycerol concentration on the characteristics of bioplastics made from cassava starch. This study used a factorial Completely Randomized Design (CRD) with two factors: cellulose addition (2, 3, and 4 g) and glycerol (2, 3, and 4 mL), with two replications. The characteristics of bioplastics observed include tensile strength, elongation, water absorption, biodegradability, and preference tests. The results showed that the addition of cellulose, glycerol, and the interaction of the two had no significant effect (P>0.05) on all observed parameters.

Page 36 of 36 | Total Record : 355

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