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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 6 Documents
 1 
Search results for , issue "Volume 3, Issue 2, Year 2021 (October 2021)" : 6 Documents clear
Optimization of clove flower oil extraction (Syzgium aromaticum L.) With Factorial Design Method Muhammad Asror Muwaffaq; Edy Supriyo
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (273.19 KB) | DOI: 10.14710/jvsar.v3i2.12182

Abstract

Solid-liquid extraction or commonly called leaching is the removal of the solute fraction (solute) from a solid to a liquid solvent. This extraction has become a widespread oil extraction process due to the high percentage of oil produced. Soxhletation method is an extraction method that contacts a solid and a liquid by dissolving it in the liquid phase at reflux. Clove oil is an essential oil that can be produced from distillation method on parts of the clove plant, especially the leaves and flowers of cloves. All parts of the clove plant contain oil, but the flowers contain the most oil. Because the leaves and twigs of cloves also produce oil, they also become a side income for clove farmers who harvest clove flowers for cigarettes. One of the most important ingredients in clove oil is eugenol, eugenol has many benefits from antiseptic to stimulant. Isopropyl alcohol is a unwell-known solvent specially to essential oil solvent, isopropyl alcohol is a solvent that can be recovered back into a solvent form usually using distillation method. The selection of isopropyl alcohol as a solvent is based on its high boiling point compared to other solvents and has elements of carbon, hydrogen, and oxygen that can dissolve polar molecules and their alkyl groups. 
The Effectiveness of Biosorbent from Chicken’s Egg Shell and Durian Peel towards the Quality of Biodiesel Product from Waste Cooking Oil Dwi Kristanto; Isti Pudjihastuti; Rizka Amalia
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (297.407 KB) | DOI: 10.14710/jvsar.v3i2.12620

Abstract

Indonesia is the largest exporter of palm oil  with 85 - 90% of the world's total palm oil production. The consumption of palm oil in Indonesia  is increasing every year, thus the waste are also  increase. Waste cooking oil contains carcinogenic substances which causes various diseases. Biodiesel is an environmentally friendly substitute fuel for diesel made from vegetable oil as raw material. Used cooking oil can be used as raw material for biodiesel production, but it needs to be purified before further processing. Chicken egg shell contains 90% of CaCO3 can be used as a biosorbent of used cooking oil. Durian skin contains 50% - 60% of cellulose also has the potential as a biosorbent. This research was conducted to investigated the effectiveness of the combination of chicken egg shell biosorbent with durian skin for the purification process of used cooking oil as a raw material of biodiesel. Biosorbent was produced by carbonization process in a furnace at a temperature of 550oC for durian skin and 9000C for chicken egg shells. The results show that the acid number of used cooking oil has met the parameters of the SNI 3741: 2013, namely 0.43 mgKOH / gr and FFA levels of 0.0024% with a yield of 62.76%. The purified cooking oil was then continued with the transesterification process to produced biodiesel. The biodiesel obtained had the cetane numbers B100 of 33.8 and B30 of 45.2.
Quality Analysis of Liquid Soap Formulation Made from Virgin Coconut Oil with Addition of White Tea Extract Anna Amelia Meizalin; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.275 KB) | DOI: 10.14710/jvsar.v3i2.12651

Abstract

The production of bath soap based on natural ingredients is still rarely found in the market. Many in circulation still use synthetic materials as active ingredients. In this soap-making formulation using natural antioxidants in the form of white tea extract, anti-oxidants from plant extracts are usually added as additives (1-8% of the final soap composition). The research method used is a response surface methodology with a Central Composite Design (CCD) design. The resulting liquid soap product will be analyzed including physicochemical tests and organoleptic tests. Soap with the most appropriate quality according to SNI fell on the 4th variable, with the addition of KOH of 67 grams and a reaction time of 35 minutes. Variable soap 4 has a pH of 10, a free alkali content of 0.0541%, and an unsaponifiable fat content of 0.37%.
Temperature Optimization and Addition of Aloe Vera Gel as Antibacteria In Coconut Oil-Based Liquid Soap Azizah Rahman; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.56 KB) | DOI: 10.14710/jvsar.v3i2.12655

Abstract

This study aims to determine the optimization of the ratio of coconut oil to KOH and temperature in the manufacture of liquid soap. In this study, the saponification reaction was used by reacting coconut oil with a strong base of KOH. The mole ratio between coconut oil and KOH used is 1:3, 1:4 and 1:5. The temperature used 3 points, there are 30oC, 40oC, and 50oC. Parameters observed were free fatty acid, pH, free alkali content, unsaponication fat content, density, and viscosity. The best results in the physiochemical test were running 4 (KOH ratio 5 and temperature 50oC) with pH 8, free alkali content of 0%, unsaponication fat content of 0.00175%, density 1.02 g/ml, viscosity 715.87 cP, and 1% free fatty acids. The critical value for the optimization of the liquid bath soap formula on the level of unsaponification fat based on RSM data is achieved at a KOH ratio of 4.28758 with a temperature of 62.40793oC.
The Effect of Bacillus subtilis on Bioethanol Production from Ambon Banana (Musa paradisiaca var. sapientum Linn) Peels by Using Fermentation Process Gaudentius Bilyartinus; Anggun Puspitarini Siswanto
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.352 KB) | DOI: 10.14710/jvsar.v3i2.11081

Abstract

Abstract -The breakthrough to optimize Indonesia's energy is by utilizing abundant renewable energy sources. Its geographic location has the potential to become a country with the largest renewable energy source in the world. The potential energy that comes from vegetables is called bioethanol. Bioethanol is an organic fuel produced by bioethanol fermentation. It can be an alternative material for making sanitary products amid the increasing spread ofCOVID-19 in Indonesia.So the authors try to innovate how to use Ambon Banana (Musa paradisiaca var. sapientum Linn) peels to become bioethanol. This research aimed to investigate the effect of Bacillus subtilis in the fermentation of bioethanol production from Ambon banana peels. The methods used were pretreatment, hydrolysis, fermentation, and distillation. Bacillus subtilis and Saccharomyces cerevisiae ratio (10: 5 and 5: 5) use for obtaining high ethanol yields, as well as variations in pH 2 and 6 in the fermentation starter. The variable were designed by using Factorial Design. The result shows the yeast ratio of B. subtilis and S. cerevisiae (10: 5) resulted the highest concentration of bioethanol (6%) in 6 days. In acidic conditions (pH 2), the bacteria don’t grow optimally. The higher concentration of bioethanol (6%) was reached  in pH 6.The research supports the Government Program Reducing the dependency of fossil fuels and innovation to produce sanitary product from bioethanol.Abstract -The breakthrough to optimize Indonesia's energy is by utilizing abundant renewable energy sources. Its geographic location has the potential to become a country with the largest renewable energy source in the world. The potential energy that comes from vegetables is called bioethanol. Bioethanol is an organic fuel produced by bioethanol fermentation. It can be an alternative material for making sanitary products amid the increasing spread ofCOVID-19 in Indonesia.So the authors try to innovate how to use Ambon Banana (Musa paradisiaca var. sapientum Linn) peels to become bioethanol. This research aimed to investigate the effect of Bacillus subtilis in the fermentation of bioethanol production from Ambon banana peels. The methods used were pretreatment, hydrolysis, fermentation, and distillation. Bacillus subtilis and Saccharomyces cerevisiae ratio (10: 5 and 5: 5) use for obtaining high ethanol yields, as well as variations in pH 2 and 6 in the fermentation starter. The variable were designed by using Factorial Design. The result shows the yeast ratio of B. subtilis and S. cerevisiae (10: 5) resulted the highest concentration of bioethanol (6%) in 6 days. In acidic conditions (pH 2), the bacteria don’t grow optimally. The higher concentration of bioethanol (6%) was reached  in pH 6.The research supports the Government Program Reducing the dependency of fossil fuels and innovation to produce sanitary product from bioethanol.
The Optimization of Addition of Bromelain Enzyme Catalyst on the Fermentation of Coconut Milk to VCO (Virgin Coconut Oil) Using Tempeh Yeast Itta Rahmalia; Heny Kusumayanti
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.562 KB) | DOI: 10.14710/jvsar.v3i2.11949

Abstract

Coconut (Cocos nucifera) is one of the most abundant tropical plants in Indonesia. It is proven that in 2020 the total area of coconut plantations in Indonesia reached 3,377,376 hectares. Virgin Coconut Oil (VCO) is one of the diversified coconut products with high commercial value. In this study, the production of Virgin Coconut Oil (VCO) was carried out by fermenting tempeh yeast and with the help of the bromelain enzyme as a catalyst. This is because the bromelain enzyme is a type of protease enzyme that acts as a protein breaker in the oil contained in the coconut milk emulsion. Research has shown that the concentration of the bromelain enzyme affects the yield of VCO. Virgin Coconut Oil (VCO) with the addition of 6 grams of bromelain enzyme, 30 hours of fermentation time, and the use of 2 grams of tempeh yeast resulted in the highest yield value of 9.2% and free fatty acids (FFA) of 0.21%. This is because the higher the bromelain enzyme concentration, the more it will bind to protein as a substrate. In addition, the longer the fermentation, the more hydrolysis that occurs in the oil, so that the fermentation time also affects the concentration of free fatty acids of VCO. Analysis of fatty acid content was carried out using the GCMS method and showed that the highest fatty acid content was lauric acid at 54.27%. While the physical characterization of the resulting VCO is in accordance with SNI 7381:2018, which has a distinctive smell of coconut aroma, a distinctive taste of coconut oil, and is colorless.

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