cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Eko Didik Widianto
Contact Email
rumah.jurnal@live.undip.ac.id
Phone
-
Journal Mail Official
jvsarvokasiundip@gmail.com
Editorial Address
Vocational School of Diponegoro University Jl. Prof. H. Soedarto, S.H. Tembalang, Semarang 50275
Location
Kota semarang,
Jawa tengah
INDONESIA
Journal of Vocational Studies on Applied Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 26848090     DOI : -
Core Subject : Engineering,
Engineering
Journal of Vocational Studies on Applied Research [e-ISSN 2684-8090] is an open access peer reviewed journal published by Vocational School Diponegoro University Semarang Central Java Indonesia. Journal of Vocational Studies on Applied Research is an Journal publishing academic and industrial topics which covers area of interest on applied research as well as vocational studies. Research papers on Engineering, Science and Vocational Studies are welcomed. The Journal is double-blind reviewed which accepts Original Research Paper, Short Communication and Review Articles.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 75 Documents
 4   5   6   7   8 
Optimization of Soxhlet Extraction of Candlenut Oil (Aleurites moluccana (L.) willd) Using Factorial Experimental Design Level 23 Fachrina, Salsabila; Broto, R. T. D. Wisnu
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17143

Abstract

Candlenut (Aleurites moluccana (L.) wild) is a plant of the Euphorbiceae family. Candlenut oil is obtained by extracting the oil content in candlenut seeds. Soxhlation is an effective method for solvent extraction, ensuring continuous contact between the solvent and the material to extract the oil efficiently while maintaining the purity of the solvent. In this study, optimization of candlenut oil extraction was carried out using the factorial experimental design level 23. Using this method, it can be determined that the extraction time is the most influential variable in the candlenut oil extraction process. The results showed that the optimum operating conditions were an extraction time of 185 min, a candlenut seed powder size of 20 mesh, and a ratio of material-solvent ratio of 1:6 g/g, resulting in an oil yield of 43.2%. The analysis of candlenut oil conducted at an extraction time of 185 min revealed the following results: a refractive index value of 1.4736, a moisture content of 0.08% bb/b, which complies with the standard SNI 01-4462-1998 for candlenut oil, a viscosity of 15.47 Cp, and a density of 0.869 g/mL. The analysis of the free fatty acid number of 2.4%bb/b and saponification number of 181.55 mg KOH/g is not consistent with SNI 01-4462-1998 candlenut oil.
Optimization of Papaya Seed Oil Production Process (Carica papaya L.) with Soxhlation Extraction Method using Factorial Design Salsabila, Salsabila; Broto, R. T. D. Wisnu
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17308

Abstract

This study aims to optimize the extraction of papaya seed oil (Carica papaya L.) using a factorial design level 2. Papaya seeds are a significant component of the fruit, comprising approximately 14.3% of the total fruit weight. These seeds contain about 25% vegetable oil, predominantly composed of unsaturated fatty acids, which have the potential to be processed into consumable oil. The extraction method employed is Soxhlet extraction using a non-polar solvent, n-hexane. A factorial design level 23 was utilized to determine the most influential process variables. The variables were considered to the ratio of papaya seed mass to solvent volume (1:7 and 1:11), particle size (10 and 30 mesh), and extraction time (170 and 190 min). Optimization was conducted using the quicker method calculation, where the determination of the largest effect and the largest main effect played a crucial role. The analysis revealed that the ratio of papaya seed mass to solvent volume had the most significant main effect, with an effect value of 0.1217. From the analysis, it was found that the 1:7 ratio produced the lowest level of Free Fatty Acids (FFA) in the oil, at 0.5076%, which aligns with the Indonesian National Standard (SNI) requirement of 0.36-0.82% FFA content. Furthermore, an analysis of density, viscosity, and moisture content was conducted on the 1:7 ratio. The test results showed that the 1:7 ratio resulted in an oil density of 0.924 g/mL, moisture content of 0.07127%, and FFA content of 0.5076%. However, based on theoretical knowledge, an increase in FFA content leads to a decrease in oil quality. Additionally, higher ratios corresponded to increased moisture content and density. In conclusion, the papaya seed oil produced in this study complies with the Indonesian National Standard (SNI, 01-3555-1998) regarding FFA content (0.36-0.82%), moisture content (maximum 0.15%), and density (0.924-0.929 g/mL).
Optimization of Soxhlet Extraction Papaya Seed Oil (Carica papaya L.) with Petroleum Ether Andriana, Riski; Broto, R. T. D. Wisnu
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17338

Abstract

Papaya seed oil is a high source of fatty acids, especially oleic acid, and palmitic acid. It has 71.60% oleic acid, 15.13% palmitic acid, and has a low cholesterol content so it can be useful as a food oil. This study aims to determine the effect of the ratio of ingredients, time, and particle size on the maximum extraction of papaya seed oil. Extraction of papaya seed oil was carried out by the soxhletation extraction method using petroleum ether solvent. The factorial experimental design of 23 was used to determine the significant parameters for the resulting papaya seed oil: yield, density, fatty acid content, viscosity, and water content. The most influential process variable is particle size. The most optimal papaya seed oil extraction results were obtained at a particle size of 20 mesh, an extraction time of 180 minutes, and a ratio of ingredients to the dissolution of 1:9 (35 gram500 mL). That value obtains a yield of 57.029%.
Production of Analog Rice From Composite Flour : Mocaf, Corn, and Porang Flour Florie, Ghiffara Amanda; Kusumayanti, Heny
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.22662

Abstract

Rice is a primary food that commonly consumed by people in Indonesia and even in Asia. Apart from rice, Indonesia actually has various kinds of plants that can be used as a primary foods such as corn, cassava, sweet potatoes, sago, etc., but are still rarely consumed by the public. Analog rice can be an alternative so that Indonesian people can consume non-rice primary foods with a similar texture to rice. In this research, analog rice was made from raw material such as cassava, corn and porang tubers. The aim of this research is to produce analog rice from a mixture of mocaf, corn flour and porang flour and determine public acceptance of analog rice products based on organoleptic tests. The production of analog rice consists of several processes such as preparing raw materials, mixing, steaming, extrusion process and drying the analog rice. Based on research, it was found that F1 and F5 formulation were the best analog rice based on organoleptic tests, and F5 formulation was the closest to IR64 rice based on proximate tests.
Production of Edible Film from Isolate Soy Protein with Addition of Palmitic/Lauric Acids Muhammad, Firnanda Rayyan; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.21382

Abstract

On the structure, physical and functional properties of soy protein isolate/sodium alginate films, the influence of chain length and concentration of various fatty acids (palmitic acid and lauric acid) was evaluated. The fatty acid content of the films was validated by Fourier transform infrared spectroscopy. The opacity of films treated with fatty acids increases with increasing fatty acid chain length or concentration. The ability of a film to act as a moisture barrier is strongly influenced by the type and concentration of fatty acids. Films impregnated with stearic acid outperform other films in terms of effectiveness. Compared with films integrating stearic acid, those containing lauric acid showed greater elongation at break. Insoluble particles and greater roughness were seen in scanning electron micrographs of films containing fatty acids. These findings suggest that appropriate fatty acids can be used to create biopolymer-based films with the required characteristics. From this research it was found that the most optimal conditions for making edible film made from protein isolate with the addition of lauric acid and palmitic acid are a fatty acid ratio of 2:3, drying at a temperature of 75°C and drying for 3 hours to obtain a tensile strength value of 0.97 MPa and elongation of 24%.
Effectiveness of Triethanolamine as Emulsifier in Chamomile Lotion Stability Asari, Yunita Dwi; Nur’ Aini, Laela; Ikmalanas, Salma; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.23712

Abstract

Lotion is a cosmetic product with a lighter consistency than cream, consisting of a mixture of oil phase and water phase, with emulsifying ingredients, moisturizers, active substances, and fragrances. Its function is to hydrate the skin, reduce irritation, and protect from environmental influences. Chamomile extract and niacinamide provide additional benefits, such as anti-inflammatory characteristics and increased skin moisture. This study aims to evaluate the effectiveness of triethanolamine (TEA) as an emulsifier in lotion stability during storage, as well as the effect of stirring temperature on lotion quality. The research method used a 2 x 3 factorial design quantitatively. Of the 8 lotion formulas tested, only formula 3 met the standard requirements of organoleptically, pH, specific gravity and homogeneity tests. This formula has a TEA volume of 2 ml, mixing time for 25 minutes at 70℃, pH 8, foam texture, slightly yellow-green color, specific gravity 0.972, and homogeneity. This formula provides a moisturizing effect on the skin without side effects
Production of Margarine from Rice Bran Oil and Palm Kernel Oil and Analysis of Physicochemical Properties Oktaviani, Rosiana; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.19797

Abstract

Rice bran oil is a healthy food that contains vitamins, antioxidants, and nutrients needed in the human body and is widely used in food and cosmetics. Rice bran oil in Indonesia has also not been widely utilized as a raw material for food products. Therefore, to change the economic value of rice bran oil can be used as a food product, one of which is margarine. This study aims to determine the optimum conditions for making margarine from rice bran oil and palm kernel oil. The tests carried out in this study were water content, fat content, and emulsion stability tests. In this study, margarine was made with three variables, namely the ratio of rice bran oil and palm kernel oil (80:20; 70:30), stirring time (30 minutes, 40 minutes), and margarine storage time (5 days, 10 days) which will be designed using Factorial Design method. Based on the results, the optimal margarine formula from rice bran oil and palm kernel oil is in the variable stirring time of 37 minutes and 30 seconds, oil ratio of 80:20, and storage time of 5 days. In the optimum sample, the value of fat content was 82.94 ± 0.08%, moisture content was 14.08 ± 0.14%, and emulsion stability was 91.15 ± 0.21%.
Efficiency of Betacyanin and Betaxanthin Extraction from Red Beets (Beta vulgaris L.) using Microwave-Assisted Extraction (MAE) Pramudika, Satya; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.22011

Abstract

Red beet pigments, betacyanin and betaxanthin, possess both health benefits and potential as natural colorants. This study investigated the efficacy of Microwave-Assisted Extraction (MAE) for their extraction from red beets. Pretreated beets were subjected to MAE employing varying microwave power levels (200, 400, and 600 W) and solvents (water, ethanol, and ethanol + citric acid). Betacyanin content varied from 23.77 to 59.28 mg/100g. Higher microwave power significantly increased betacyanin yield (p < 0.05), while the type of solvent did not exert a significant influence. Betaxanthin content was also affected by both microwave power and solvent polarity. Higher power settings and the more polar solvent mixture (ethanol + citric acid) resulted in greater extraction. These findings demonstrate the effectiveness of MAE for extracting both pigments from red beets, with optimal conditions dependent on the target compound of interest.
Effectiveness of Avocado Seed Extract on the Detergent Production Process Nolalita, Aureliya Helmaleni; Karyadi, Nabila Putri; Santoso, Shafira Ardaneswari; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.23713

Abstract

This study aims to determine the effectiveness of avocado seed oil as a substitute for SLS which can be used to make environmentally friendly detergents. The method used in this research is mixing. The results obtained in this study are in the density test samples that meet the requirements are sample 1, sample 2, sample 5, and sample 6. In the viscosity test, high viscosity results were shown in sample 6. In the overall results of the pH test, the sample obtained a pH of 11 which did not meet SNI standards. If the pH of a detergent is more than 8-10 it will risk causing irritation to the skin and environmental pollution. In the saponin test, avocado seed extract contains saponin compounds because saponin compounds are known to form foam due to the combination of constituent compound structures. In the foam stability test, the foam produced must last around 60-70% of the initial volume and in the observation there are 4 samples that meet these requirements, namely sample 1, sample 3, sample 6, and sample 7 respectively 72%, 81%, 72%, and 81%. It can be concluded that sample 6 is better than the other samples
Assessing the Impact and Utilization of Three-Wheeled Cargo Motorcycles by MSMEs in Central Java Mege, Stacia Reviany; Windriya, Anafil; Werdania, Riandhita Eri; Budiyono, Budiyono
Journal of Vocational Studies on Applied Research Volume 5, Issue 2, Year 2023 (October 2023)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i2.23547

Abstract

The increasing number of Micro, Small, and Medium Enterprises (MSMEs) has led to a high demand for transportation to support business operations. This is particularly true for the use of three-wheeled cargo motorcycles, which are widely used by MSME actors, especially in the Central Java region. This study focuses on eight regions where MSMEs operate: Semarang, Kendal, Ungaran, Demak, Boyolali, Klaten, Sukoharjo, and Solo. The research aims to identify the differences between three-wheeled motorbikes and pick-up trucks and to determine the level of need among MSME operators for three-wheeled motorbikes as transportation to support their business activities. The author employs a descriptive approach using qualitative methods. The research findings indicate several differences between three-wheeled motorcycles and pick-up trucks in terms of functionality. Three-wheeled motor vehicles are more stable, flexible, economically priced, fuel-efficient, and suitable for transporting small goods over short distances. There is a high level of community demand for the use of three-wheeled motor vehicles to support business operations, particularly for the sale of food and beverages such as fresh milk, tobacco, LPG gas cylinders, gallon mineral water, animal feed, and various agricultural commodities to traditional markets. Additionally, three-wheeled vehicles greatly assist MSME operators in their business operations by offering small-scale cargo transport capacity and facilitating access to regions with limited land availability for roads.

Page 6 of 8 | Total Record : 75

 4   5   6   7   8 

Filter by Year

2019 2025


Reset
Filter By Issues
All Issue 2025: Just Accepted Manuscript and Article In Press 2025 Volume 6, Issue 2, Year 2024 (October 2024) Volume 6, Issue 1, Year 2024 (April 2024) Volume 5, Issue 2, Year 2023 (October 2023) Volume 5, Issue 1, Year 2023 (April 2023) Volume 4, Issue 2, Year 2022 (October 2022) Volume 4, Issue 1, Year 2022 (April 2022) Volume 3, Issue 2, Year 2021 (October 2021) Volume 3, Issue 1, Year 2021 (April 2021) Volume 2, Issue 2, Year 2020 (October 2020) Volume 2, Issue 1, Year 2020 (April 2020) Volume 1, Issue 2, Year 2019 (October 2019) Volume 1, Issue 1, Year 2019 (April 2019) More Issue