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Konversi
Published by Universitas Lambung Mangkurat
ISSN : 23023686     EISSN : 25413481     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 14, No 1 (2025): APRIL 2025" : 8 Documents clear
Development of antioxidant-rich edible film using eggshell and tapioca flours with kelakai (Stenochlaena palustris) extract Ma'rifah, Yulia Nurul; Adawiyah, Mariatul; Ariwibowo, Sigit; Nata, Iryanti Fatyasari; Juwita, Rinna; Vo, Duc-Thang
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.22280

Abstract

One of the major challenges in the food industry in the limited shelflife products. A promising approach to address this issue is the use of edible films-thin, consumable layers that protect food from environmental factors such as moisture, oxygen, and humidity. This study aimed to evaluate edible films based on varying ratios of chicken eggshell flour and tapioca flour, determine the optimum concentration of Kelakai (Stenochlaena palustris) extract as an antioxidant source, and assess the films’ physical, chemical, and application properties. Edible films were prepared using eggshell flour (0-30% w/w), tapioca flour (5 g), distilled water (93.5 mL), Kelakai extract (0-10% v/v), and glycerol (1.5 g). The mixture was heated to ±96°C at 1000 rpm for 40 minutes, cast into 20 × 10 cm molds, and dried at 50°C for 24 hours. The best formulation—10% eggshell flour with 5% Kelakai extract—produced a film with 0.174 mm thickness, 1.5 MPa tensile strength, 27.4% elongation, and water vapor transmission rate of 10.0278 g/m²·h. FT-IR analysis revealed C-H, O-H, and C=O functional groups. Antioxidant activity showed 5.19% scavenging activity after 10 minutes. The film successfully preserved sausage for 7 days, demonstrating its potential to extend shelf life and serve as an eco-friendly packaging alternative.
Analysis of protein content of deffated black soldier fly (BSF) maggot flour with variations in drying temperature Sanjaya, Ari Susandy; Nurjanah, Tera; Johnson, Christiano; Nugroho, Rudy Agung; Firmansyah, Dudi Adi; Wibowo, Arief C.
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.20735

Abstract

This study aims to determine the protein content in maggot flour based on differences in drying temperatures. Maggots or black soldier fly larvae are currently known for their high protein content and have the potential as a substitute for animal feed. The flouring process is carried out by drying the maggots and then extracting the drying results to obtain flour. This study was conducted by drying maggots with temperature variations of 60 ℃, 90 ℃, and 120 ℃ for 3 hours. Dried maggots were also used with a different process, namely the roasting method as a comparison. The results of the study showed that the higher the drying temperature, the more flour would be produced during the extraction process. Protein content testing was carried out using the Kjeldhal method. The results of this study showed that with a drying temperature of 120 ℃, flour had the highest average protein content of 22.63% while with a temperature of 60 ℃ it had the lowest protein content of 16.25%. Other results also showed that drying with the roasting method could provide a difference in protein content of 18.45%. The decrease in protein levels during the roasting process itself can occur as a result of the protein denaturation process that occurs during the drying process.
Trans-esterification of pangansius hypolatamus tallow waste with ethanol by electrolysis process and KO0H as catalyst Afrah, Bazlina Dawami; Rendana, Muhammad; Pratama, Muhammad Yori; Putri, Tiara Maharani Ramona; Rahmadianti, Nurulia; Sabrina, Dina
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.20859

Abstract

Consumption of fuel energy continues to increase every year. Still, the fuel used today is almost entirely derived from fossil materials that are toxic to the environment and not renewable, so they need renewability to be guaranteed. One solution to this problem is ethyl ester based on catfish (Pangasius Hypothalamus) tallow waste. The catfish fish tallow is extracted first and then in a liquid phase and then reacted with the help of a KOH catalyst (1%; 1.5%; 2%) by electrolysis method using copper electrodes with a transesterification reaction. The research was conducted on the ratio of raw materials to ethanol of 1:5, 1:6, and 1:7 with a power supply voltage of 20V. It can be seen from the research results that the mole ratio of raw material and ethanol at 1:6 produces ethyl esters with a tendency to be of better quality. The best ethyl ester yield was obtained at a ratio of 1:6 raw material and 1.5% catalyst amount, and the resulting yield was 92.4058%.
Sonochemical-assisted biosynthesis of silver nanoparticles using cymbopogon nardus L. essential oil: advanced process optimization through response surface methodology Wira, Guardiola Rosa; Maharani, Hijria Putri; Erliyanti, Nove Kartika; Panjaitan, Renova; Pujiastuti, Caecilia
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.21906

Abstract

This research investigates the fabrication and characterization regarding silver nanoparticles (AgNPs) utilizing essential oil derived from citronella leaves (Cymbopogon nardus L.) as a bioreductant. The synthesis method employed is sonochemistry, with variations in pH levels to determine optimal conditions for AgNPs yield. The use of essential oil as a bioreductant offers eco-friendly advantages and high efficiency in reducing metal ions. The results indicate that the highest yield of 8.67% was achieved at pH 9.0280 and 59.7190 minutes of sonochemical processing. Statistical optimization of processing parameters was conducted to maximize the yield of AgNPs, with the optimization process analyzed using Response Surface Methodology (RSM). The sequence of experimental runs, condition variations, and obtained results were determined using the Central Composite Design (CCD). The model demonstrates a strong correlation with the experimental data, exhibiting an adjusted R² value of 0.9684. A high F-value of 30.61 and a low p-value of 0.0009 suggest that the regression model is statistically significant and effectively accounts for variations in AgNPs yield. The lack-of-fit value for the model is 0.0359, indicating no significant discrepancy between the experimental data and the model's predicted values. The successful formation of AgNPs was confirmed, with absorption peaks observed within the 400–450 nm range.
Isolation and characterization of docosahexaenoic acid producing Thraustochytrids from mangrove ecosystem Humaidah, Nurlaili; Muslichatin, Wirdhatul; Setyawati, Dyah; Puspita, Niniek Fajar; Nakai, Satoshi; Purwasih, Sasanti Bhekti; Putri, Nurhalida Listiani
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.22114

Abstract

Polyunsaturated Fatty Acids (PUFAs) are unsaturated fatty acids that include DHA fatty acids. The conventional source of DHA is derived from various species of fish in the form of fish oil. DHA content in fish oil is relatively low, ranging from 7-14%, which necessitates the use of large quantities of fish, potentially leading to overfishing. Alternative source of DHA can be obtained through the isolation of thraustochytrids. Thraustochytrids can produce relatively higher levels of DHA and does not require extensive land areas for cultivation. This study aims to identify applicable techniques for isolating and identifying Thraustochytrid strains local to mangrove areas in East Java, `to examine the growth and general fatty acid profile, and to identify the most effective methods for controlling contamination during Thraustochytrid growth. The isolation involved several steps, including sample preparation, isolation, pure culture development, and media control by adjusting pH and temperature. Visual observations were made using an inverted microscope to confirm the presence of Thraustochytrids followed by genetic analysis to identify the strain. The optimal growth was observed in L3P sample collected from brown mangrove leaves. The highest specific growth rate was 0.146 h-1 (L3P). DHA content was 172 mg/g from the dried cell weight biomass. The most effective method for isolation involved a pre-treatment step consisting of soaking the samples in pine pollen for 8-10 days. Thraustochytrid isolates were able to grow in media with a pH of 7 and at a temperature of 25°C.
Pectin extraction from nephelium lappaceum (binjai variety) peel using pulsed electric field Santoso, Ganes Aurora; Wicaksono, Luqman Agung; Kurnianto, Muhammad Alfid; Munarko, Hadi; Putra, Andre Yusuf Tisna; Priyanto, Anugerah Dany
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.22031

Abstract

This study aims to evaluate the effects of electric field intensity, extraction time, and solvent ratio on pectin yield from binjai rambutan skin using Pulsed Electric Field (PEF). The One Factor at a Time (OFAT) method was applied in three stages: (1) determining the optimal electric field intensity (5, 10, 15, and 20 kV/cm) with a fixed extraction time of 15 minutes and a solvent ratio of 1:30 w/v; (2) assessing the effect of extraction time (5, 10, 15, and 20 minutes) while maintaining the selected electric field intensity and a solvent ratio of 1:30 w/v; and (3) evaluating the influence of different solvent ratios (1:20, 1:30, 1:40, and 1:50 w/v) using the selected electric field intensity and solvent ratio from the previous stages. Each stage was conducted in duplicate to ensure data reliability. The collected data were analyzed using Analysis of Variance (ANOVA), followed by the Duncan Multiple Range Test (DMRT) at a 95% confidence level with SPSS v.27.0.1 software. The results demonstrate that each of electric field intensity, extraction time, and solvent ratio influence pectin yield. The optimal conditions obtained were an electric field intensity of 20 kV/cm, yielding 3.41%; an extraction time of 10 minutes, yielding 3.48%; and a solvent ratio of 1:30 w/v, yielding 3.48%.
Utilization of pineapple stems as biocatalysts in the production of coconut oil using the enzymatic method Fanani, Nurull; Nisa, Nur Ihda Farikhatin; Siswoyo, Deddy Kurniawan Putra; Tuhuloula, Abubakar; Putri, Novy Pralisa
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.22233

Abstract

The utilization of pineapple fruit stems as a by-product of the agricultural process has not been optimally utilized. Meanwhile, pineapple fruit stems have promising economic potential in the field of biotechnology and food processing. This is because pineapple fruit stems contain bromelain enzyme which is quite high compared to ripe fruit flesh, which is around 0.1-0.6%. This bromelain enzyme functions as a biocatalyst in breaking down protein and fat through the hydrolysis reaction of coconut oil. So to find out the catalytic activity of bromelain enzyme in pineapple fruit stems, the process of making coconut oil is carried out enzymatic method through variable addition of doses of 20, 30, 40, and 50% of the weight of coconut milk and enzymatic time duration of 6, 12, 18, and 24 hours. Based on the research results, the best variable is the addition of 30% biocatalyst dose and 24 hours of enzymatic process with the highest yield percentage of 67.9% and product characteristics that have met SNI 7381: 2008. This shows that pineapple fruit stems have the potential as a good biocatalyst in making coconut oil as well as providing added value to pineapple fruit stems in an effort to verify agricultural waste.
The effect of microwave power, extraction time and solvent ratio of microwave assisted extraction (MAE) method on the yield of pectin from Nephelium lappaceum Daffa Athallah, Talitha Ayu; Kurnianto, Muhammad Alfid; Priyanto, Anugerah Dany; Munarko, Hadi; Putra, Andre Yusuf Tisna; Wicaksono, Luqman Agung
Konversi Vol 14, No 1 (2025): APRIL 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i1.22033

Abstract

Pectin is a complex polysaccharide that is widely used in the food, pharmaceutical, and cosmetic industries as a thickening agent, stabilizer, and emulsifier. Extraction methods such as hot acid extraction have limitations in terms of time efficiency and yield. Therefore, the Microwave-Assisted Extraction (MAE) method is a faster and more efficient alternative. Microwave-assisted extraction is a potential method for pectin extraction from rambutan binjai peel. Conventional extraction methods (direct heating) are widely used, but have drawbacks such as long process time, low yield, and the risk of pectin degradation. Environmentally friendly or green extraction processes are now being applied, one of which is microwave-assisted extraction.Based on research results, it is known that microwave pectin extraction has a higher yield and shorter extraction time compared to conventional methods. The best extraction results were obtained at a power of 540 Watts, with an optimal extraction time of 11 minutes and a solvent ratio of 1:20, with the highest yields being 7.53%, 7.11%, and 6.48%, respectively. The objectives of this study were (i) to determine the best microwave power in the extraction process, (ii) to determine the optimal extraction time, and (iii) to determine the best solvent ratio in the extraction process.

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