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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 4, Issue 2, Year 2022 (October 2022)" : 6 Documents clear
Optimization of Liquid Soap Preparation Formula with the Addition of Black Rice (Oryza Sativa L. Indica) Extract as Anti-Radical Free based Virgin Coconut Oil (VCO) Ragil Agnes Safira Imamsyah; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.14697

Abstract

An imbalance in the body's number of antioxidants and free radicals can cause oxidative stress and trigger various degenerative diseases (WHO, 2016). One way to prevent free radicals from entering the body is to bathe with soap. Black rice extract can be an antioxidant in soap because it contains anthocyanin pigments and has high bioactive compounds (Chakuton et al., 2012). Selection of Virgin Coconut Oil (VCO) as a raw material for soap because it has a high lauric acid content and is helpful for moisturizing and smoothing the skin (Afrozi et al., 2021). This study aimed to analyze the quality of liquid soap from the hydrolyzed Virgin Coconut Oil (VCO) and the effect of using bases KOH, NH4OH, and black rice extract accompanied by varying base concentrations, time, and temperature treatments. The independent variables for process optimization were the concentration of KOH: NH4OH (30:70, 50:50, 70:30)%, stirring time (65, 85, 105) minutes, and operating temperature (60, 75, 90) °C. Based on the results obtained, the optimum level of FFA (resulting in a small FFA%) was obtained with the minimized variable conditions, namely using a concentration of 16,4% KOH, and an operating temperature of 49,7 °C, a stirring time of 51.4 minutes, and composite desirability of 0,895897.
Optimization of Biosorbent on Cd(II) Metal Biosorption Using Duck Eggshell Waste Ria Tasmalia; Nida Hamidah Prameswari; Vita Paramita
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.14749

Abstract

Every year the production of duck eggs in Indonesia has increased, this case leads to an increase in the waste of duck eggshells. Duck eggshell waste has components that can be utilized into a biosorbent. To improve the quality of the biosorbent, can be done with an activation method and immobilization method. The purpose of this study was to determine the effectiveness of biosorbents made from duck eggshell waste in absorbing Cd(II) metal. In this study, duck eggshells were activated with physical activation by heating in a furnace at a temperature of 900oC for 2 hours. Independent variables of this study are biosorbent mass, contact time and concentration of cadmium solution. Critical values for Cd levels optimization conditions are accomplished when the biosorbent mass 1.45 grams, contact time 100 minutes and Cd solution concentration 86 ppm with a percentage decrease in Cd levels in the amount of 89%.
Effect of Hydrophilic- Lipophilic Balance (HLB) Value on the Stability of Cosmetic Lotion Based on Walnut Oil (Canarium Indicium L.) Oil-in-Water Emulsion Alza Izmuliana Eka Putri; Hermawan Dwi Ariyanto
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.15376

Abstract

Walnut oil is high source of fatty acid especially oleic acid compare to coconut oil. It has about 40-70% of oleic acid and suitable as moisturizing agent, anti-inflammatory and which contains antioxidants that are good for skin health as a primary ingredient for lotion. This study aims to determine the effect hydrophilic-lipophilic balance (HLB) on the stability of emulsion as a lotion material. The oil-in-water emulsion was formed by emulsification process using Ultra Turrax homogenizer (8000 and 32000 rpm) with addition of tween 80 and span 80 as emulsifiers. Completed randomized design and analysis of variance were used to determine the significant parameters on the stability of emulsion: homogeneity, creaming index, viscosity, density and morphology. Emulsion with the highest stability is sample 8 which is formed at 14.5 HLB value and 32000 rpm homogenizer speed during 5 min. It has complied with SNI-16-4399-1996.
Utilization of Papain Enzymes on the Production of Virgin Coconut Oil Syifa Ranggita Sabbila; R.T.D. Wisnu Broto
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.16036

Abstract

VCO is an oil that has many benefits for the human body. In the health sector, VCO can function to increase the human body's resistance and accelerate the healing of diseases and obesity. Making VCO can be done in various ways, one of which is by enzymatic method with the help of papain enzymes. The purpose of this study was to determine the most influential variable on the making of virgin coconut oil. The method used is by fermentation using papain enzyme catalysts and the temperature and time of fermentation according to the specified variable and analysis of water content and free fatty acids using factorial design 2x3. The results obtained from the study of the most influential effect on water content and free fatty acids are time variable and enzyme concentration, while the most influential interaction variables are fermentation time and temperature. The optimum water content obtained is 0.18% and free fatty acids are 0.28%. The optimum combination of independent variables that can produce optimum water content and free fatty acids is papain enzyme concentration of 3gr, temperature 33oC, and fermentation time of 24 hours.
Implementation of Ambon Banana Peel (Musa Paradisiaca) as Foaming Agent of Banana Fruitghurt using Foam Mat Drying Method Cindyana Putry; Vita Paramita; Indah Hartati
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.15821

Abstract

Fruitghurt is a product of lactic acid fermentation, namely L. bulgaricus and S. Thermopillus in an acidic state enriched by nutrients from fruit such as Ambon banana but has a short shelf life. Bananas have a role as an additional nutrient in the form of glucose which then becomes a nutrient for lactic acid bacteria. Foam mat drying itself is a drying method that is better than other types of drying because it does not require large production costs and protects the structure of the material through the formation of foam. Application of foam mat drying on fruitghurt using Ambon banana peel extract as a foaming agent is expected to increase the shelf life of fruitghurt as well as an alternative foaming agent derived from vegetable protein Ambon banana peel contains a protein content of about 0.64% when bananas experience a good level of maturity. In the manufacture of fruitghurt powder, the research method used is Response Surface Methodology (RSM) with variables changing the concentration of banana peel extract as a foaming agent, the concentration of maltodextrin as a binder and mixing time. The resulting fruitghurt powder will be analyzed for water content, total acid analysis and pH analysis. The research data were processed using minitab 19 software. The best fruitghurt powder results were found in the 9th variable, namely the minimase variable, where the optimum conditions were banana peel extract concentration of 2.38 ml, maltodextrin concentration of 30 grams and stirring time of 20 minutes. Fruitghurt variable 9 has a pH of 5 after drying which is in accordance with SNI 01-2981-2009, water content is 0.64% and total acid is 1.08%
Formulation of Drying and Non Drying Oil Alkyd Resin from Palm Oil (Elaesis guineensis jacq.) and Tuna Fish Oil (Thunnus sp.) toward Acid Number Value and Non Volatile Content as Surface Coating Resin Desmilia Sefti Indrawaty
Journal of Vocational Studies on Applied Research Volume 4, Issue 2, Year 2022 (October 2022)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i2.16624

Abstract

Resin is a polymer chemical substance that is made up of monomers from carbon and nitrogen. Alkyd resin, a surface coating resin, produced by polycondensation reaction between polybasic and polyhydric alcohols, modified with monobasic acids or their anhydrides, and drying oil at controlled temperatures. Alkyd resin is widely used in the paint and surface coating industries. The advantages of this resin are its strong chemical and thermal resistance, quick drying power, and inexpensive cost. Alkyd resins can be produced from natural oil (palm and tuna fish oil). Oil derived from palm and tuna fish is known as natural oil. Tuna fish oil includes 40.04 % oleic acid. The oleic content is suitable for use in the alcoholysis process in the production of alkyd resins. The major ingredients in this study were tuna fish oil and palm oil. The aim of this research is to determine the influence of a combination of palm oil:tuna fish oil ratio, amount of pthalic anhydride, and temperature of alcoholysis process on the value of acid number and non-volatile content of alkyd resin was investigated using a Completely Randomized Design (CRD).

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