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Contact Name
Eko Didik Widianto
Contact Email
rumah.jurnal@live.undip.ac.id
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jvsarvokasiundip@gmail.com
Editorial Address
Vocational School of Diponegoro University Jl. Prof. H. Soedarto, S.H. Tembalang, Semarang 50275
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Kota semarang,
Jawa tengah
INDONESIA
Journal of Vocational Studies on Applied Research
Published by Universitas Diponegoro
ISSN : -     EISSN : 26848090     DOI : -
Core Subject : 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.
Articles 6 Documents
Search results for , issue "Volume 5, Issue 1, Year 2023 (April 2023)" : 6 Documents clear
The Effect of Composite Flour Ratio (Cassava, Gembili, Koro Pedang, and Corn) and Extrusion Temperature on Analog Rice Production
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17610

Abstract

The growing population affects an increasing number of Indonesian people, influencing their rice consumption and encouraging Indonesia to import rice. One of the alternatives is to use raw materials such as potential non-rice tubers. In this study, raw material composite flour was made from cassava (Manihot esculenta), gembili (Dioscorea esculenta), koro pedang (Canavalia ensiformis), and corn (Zea mays), which is the basic ingredient of rice maker analog. This research aimed to examine the influence of the raw material composition on the value of nutrients, the physical-chemical properties of analog rice compared to a rice paddy, and the best temperature of analog rice using organoleptic tests. The process of producing analog rice consists of several stages of research, including the manufacturing of composite flour, the cooking of dough with composite flour, the production of analog rice, and the drying of analog rice. Based on the results, samples of 5 (60% cassava flour, 5% gembili flour, 10% koro pedang, and 25% corn flour) as an analog of rice with the best formulations in various compositions. Based on a proximate analysis of the effect of temperature, a temperature of 75 °C is the optimum temperature for the extrusion process. The results of the physical analysis of the best analog rice in this study have a density of 0.46 g/mL, water absorption of 60.52%, and a cooking time is 46 minutes. The analog rice has the same texture, aroma, and appearance as rice in general, although the rice from the analog composite flour tends to have a savory flavor arising from koro pedang. According to the results of this study, the analog rice could be used as a substitute to lessen dependence on paddy rice.
The Effect of Moisture Content on Reducing the Free Fatty Acid Content of Nyamplung Seed Oil (Callophylum inophyllum) Using Factorial Design Method Faizal Pambayun; R. TD. Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17619

Abstract

Nyamplung seeds (Calophyllum inophyllum) have an oil content of 50–70%, in Indonesia nyamplung seeds have a high productivity of 20 t/ha. The process of extracting nyamplung seed oil chemical process produces a higher yield than mechanical. Extraction was collected using the soxhletation extraction method because the oil can be extracted perfectly and requires little solvent. The FFA content is very high, ranging from 15-30% which causes high oil quality to decrease. The high FFA content is due to the high % water content (23-25%) in nyamplung seeds, which causes a hydrolysis process where triglycerides dissociate in the presence of water, glycerol and FFA. The research variables are the moisture content of nyamplung seeds (8% and 12%), the size of the material (15 and 25 mesh), and the ratio of the material to the solvent (1:4 and 1:6) using the factorial design method for research optimization using variable moisture content Nyamplung seed is 8%, size is 20 mesh, and raw material to solvent ratio is 1:5. Novelty value research is effect of % water content on reduction of free fatty acid(FFA) levels contained nyamplung seed oil. Whereas in previous research Adenuga et al., (2021) % water content was not the main parameter for reducing free fatty acid levels. But the main parameters are only drying temperature and oven temperature. FFA content without reducing the % water content of 24 mg KOH/g Jahirul et al. (2015) and 29.2 mg KOH/g Hasibuan et al. (2013) whereas the results of the study showed an FFA level of 13.30%, which means that there was a decrease in FFA levels directly proportional to the decrease in the moisture content of nyamplung seeds.
Optimization Extraction of Sunflower Seed Oil (Helianthus Annus) Using Factorial Design Experiment with Soxhlation Method Shabrina Shabrina; R.TD. Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v5i1.17105

Abstract

Sunflower seed oil is one type of vegetable oil whose growth is still in its early stages in Indonesia. Due to a shortage of domestic availability, several edible oil enterprises in Indonesia still need to import a significant amount of sunflower seed oil. Rukmana (2004) states that the content of sunflower oil's content ranges from 23 to 45%. 11.7% oleic acid and 44-72% linoleic acid are both present in sunflower oil. The goal of this study was to identify the best process factors in light of the obtained oil yield. This study's used Fractional Design Experiment 23 with Quicker Method analysis. The results showed that the optimal operating conditions were an extraction time of 185 min, temperature of 60 ℃, and material-solvent ratio of (R) of 1:6, yielding an oil of 51.6%.
Optimization of Soxhlet Extraction of Candlenut Oil (Aleurites moluccana (L.) willd) Using Factorial Experimental Design Level 23 Salsabila Fachrina; R.TD Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

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; R. TD. Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

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 Riski Andriana; R. TD. Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 5, Issue 1, Year 2023 (April 2023)
Publisher : Vocational School of Diponegoro University

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%.

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