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
 2   3   4   5   6 
Physico-Chemical Properties of Calcium-Fortified Analog Rice from Composite Flour (Cassava, Corn, and Snakehead Fish) for Osteoporosis Prevention Sumardiono, Siswo; Pudjihastuti, Isti; Supriyo, Edy; Amalia, Rizka
Journal of Vocational Studies on Applied Research Volume 2, Issue 2, Year 2020 (October 2020)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.664 KB) | DOI: 10.14710/jvsar.v2i2.8062

Abstract

In this study, composite flour made from cassava and corn flour were processed for producing analog rice. To meet the calcium needs for the elderly andto optimize the potential of cassava, corn, and snakehead fish, the analog rice will be fortified with calcium from cork fish. The aim of this work are to study the effect of composite flour composition  and the extruxtion temperature on the physico-chemical properties of calcium-fortified analog rice. The parameter process studied were mocaf flour:snakehead fish flour (MF/SFF) mass ratio (100:0; 97:3; 94 6; 91:9; and 88:12) and extrusion temperature ranging from 50oC, 70oC, and  90oC. The physico-chemical properties including bulk density, cooking time, proximate, calcium levels and its organoleptic were analyzed. The results showed that at 91:9 MF/SFF mass ratio  and  the extrusion temperature at 70oC obtain the best effect on the nutrient content of analog rice which contain 14.34% of water, 0.85% of ash, 71.829% of carbohydrate, 11.236% of  protein, 1.12% of fat , 1,113 ppm of calcium, and 2.427% of dietary fibre.
Utilization of Alurities Trisperma Oil as Biodiesel Sari, Gustry Ratna; Satrio, M. Akbar; Mulyaningsih, Rizki; Irene, Imer Ayu; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 2, Issue 1, Year 2020 (April 2020)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (472.812 KB) | DOI: 10.14710/jvsar.v2i1.7677

Abstract

Biodiesel is one of the solutions to the many uses of fossil fuels. Biodiesel itself is a fuel derived from vegetable oil (plant or vegetable fat) called biofuel. In this study, biodiesel used is based on sunan candlenut. The purpose of this study was to determine the optimum time conditions (1.5; 2; 2.5 hours) and the comparison of solvents with candlenut (0.25; 0.2; 0.17) in the manufacture of candlenut oil, as well as knowing the process of making biodiesel. The method used is the manufacture of hazelnut oil by extraction using Soxhlet. The resulting oil was esterified using methanol with sulfuric acid catalyst at a reaction temperature of 60 0C for 60 minutes. The volume ratio between oil and methanol is 4: 1 followed by transesterification at 50 0C for 30 minutes. In the research, the results were optimum time and the number of solvents for good extraction at 2 hours and the ratio of solvents to hazelnut was 0.17. The resulting biodiesel density was 0.82 gr / ml, viscosity was 4.07Cp, FFA value was 1.4%, and the saponification rate was 274.4. From these data it can be said that the Biodiesel produced is approaching the Indonesian National Standard.
The Optimization of Addition of Bromelain Enzyme Catalyst on the Fermentation of Coconut Milk to VCO (Virgin Coconut Oil) Using Tempeh Yeast Rahmalia, Itta; Kusumayanti, Heny
Journal of Vocational Studies on Applied Research Volume 3, Issue 2, Year 2021 (October 2021)
Publisher : Vocational College of 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.
Effect of Pressure Differences on Sludge Filtration Process Efficiency by Using Plate Filter Press Saputri, Rizky Yunita; Nisa, Qurrotun A'yuni Khoirun; Yulianto, Mohamad Endy; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.742 KB) | DOI: 10.14710/jvsar.v1i2.6280

Abstract

Waste treatment in the industry produce sludge from the settling of solid material as a by product of the treatment process. The resulting sludge can’t be thrown away in large quantities because it can cause problems if there is still water content in it especially for industrial centers located around residential areas. So that filtration is carried out on the sludge from the Sedimentation Tub at the WWTP know in the area of Lamper, Semarang with the aim of reducing the volume of sludge by separating the water from the sludge before being discharged. The results of the analysis of the sludge filtration in the Settling Basin at WWTP obtained the value of cake resistance at a pressure of 75 kg / m2 of 4.42E + 11 m/kg, at a pressure of 90 kg/m2 of 5.62E + 11 m/kg and at a pressure of 104 kg/m2 of 6.74E + 11 m/kg. The results of the analysis on the resistance value of the filter medium obtained a value of 1.59E+12m-1 at a pressure of 75 kg/m2, 1.23E+12 m-1 at a pressure of 90 kg/m2 and 1.61E+12 m-1 at a pressure of 104 kg/m2. While in the analysis of water content, at a pressure of 75 kg/m2 obtained a value of 35.437%, at a pressure of 90 kg/m2 obtained a value of 35.024%, and at a pressure of 104 kg/m2 obtained a value of 34.024%. Efficiency The optimal pressure is 104 kg/m2.
The Effect of HLB Surfactant Value on The Characteristics of Emulsion Biodiesel Palm Oil Using Homogenizer Damayani, Intan Ardina; Paramita, Vita; Yulianto, Mohamad Endy
Journal of Vocational Studies on Applied Research Volume 3, Issue 1, Year 2021 (April 2021)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.447 KB) | DOI: 10.14710/jvsar.v3i1.10914

Abstract

The process of making water emulsion in palm oil biodiesel is assisted by using two types of surfactants with different HLB values, namely Tween 80 and Span 80. This study aims to determine the characteristics of palm oil biodiesel emulsion made using a homogenizer with different HLB values, surfactant composition and water content in each sample. Density, viscosity, stability and microscopy tests were carried out to determine the characteristics of palm oil biodiesel emulsion. The results were obtained in the form of the highest density and viscosity values found in samples with high HLB values, surfactant composition and water content, while for stability test results were found in samples with low HLB values, surfactant composition and low water content. This shows that the difference in the value of HLB used will affect the amount of surfactant composition and moisture content in the sample composition and will affect the density, viscosity and stability of the palm oil biodiesel emulsion formed.
The Optimization of Additional of Glycerol on the Biodegradable Foam from Corn Husk Gani, Syefrin Syahadatia; Kusumayanti, Heny
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14303

Abstract

Biodegradable foam is one of the packaging food friendly nature the environment. In process, biodegradable foam is still have low water absorpstion and low tensile strength. Biofoam made from raw starch and fiber have low tensile strength. Addition plasticizer material of glycerol can increase tensile strength on the biofoam. This research uses the baking process method. Based on research, biofoam with addition glycerol can affect the physical and mechanical characteristics of the biofoam produced. The optimum conditions for biofoam present in concentration 7% glycerol with value of the tensile strength 0.42 Mpa and value of power absorb water 35.07% and bidegradibility value in is 27.76% in 14 days. Glycerol can increase elasticity, because capable in reduce bond internal hydrogen so can decrease distance intermolecular, so that can increase value of the thensile strength. Variation condition operation influential on visuals and textures the resulting biofoam with optimum conditions 135℃ for 50 minutes. Temperature gelatinization starch sago 73 – 79℃. On this research, using variation temperature 115℃ and 135℃. And analysis result morphology show biofoam with high temperature have a high water absoprtion because if already pass temperature gelatinization starch so starch will form a paste and dissolve in water.
Optimization of Pb(II) Metal Adsorption on Pomelo Peel Biosorbent by Immobilization in Ca-Alginate Rasyid, Zulfa Wulandari; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14624

Abstract

Industrial wastewater is a source of water pollution that dominates today. Wastewater is known to cause damage to the environment, health and threatens the availability of clean water. Industrial wastewater is a problem because it contains a lot of dangerous heavy metals, one of which is Lead or Pb(II).' Adsorption technology has become one of the most exciting technologies because of its good performance. Adsorption media currently popular for the study is adsorption using agricultural waste. One of the agricultural wastes that can be used as biosorbent is grapefruit peel (Citrus maxima). The functional groups in grapefruit peel are ether, pedophilic, carboxyl, carbonyl, and hydroxyl. These functional groups are essential in binding heavy metals from the aquatic environment. In this study, grapefruit peel was modified into a Ca-alginate immobilized biosorbent. The analyzes that will be carried out include the characteristics of the biosorbent, namely the water content and ash content test, the FTIR test to determine the functional groups contained in the biosorbent, the SEM-EDX test to assess the appearance of the biosorbent, as well as analysis of the initial and final levels of Pb(II). Based on the results obtained, the best percentage decrease in Pb(II) levels was obtained with operating conditions of pH 4.7, contact time of 90 minutes, and Pb(II) concentration of 100 mg/L with a percentage decrease in Pb(II) levels of 89%.
Reducing COD Levels of Batik Waste Using Chicken Egg Shells and Tea Dregs Puspita, Anggrek Sinar; Fatmawati, Zulaikhah; Paramita, Vita
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14622

Abstract

In the last ten years, the batik industry has experienced very rapid growth. This provides benefits but also has adverse effects on humans and the environment because the sector generates waste. Batik liquid waste contains chemical compounds that can increase the COD value. Alternative treatment of liquid waste from batik factories is the biosorption process using biosorbent from chicken egg shells and tea dregs. This study aimed to investigate the effect of variations in the biosorbent ratio, contact time, and initial pH of the sample on changes in COD. In this study, the acid activation method was used to increase the ability of the biosorbent to absorb the COD content in the batik industry wastewater. This research method uses the Response Surface Methodology (RSM) method, where the biosorbent made is then contacted with batik wastewater to determine the decrease in COD levels contained in it. The critical value was achieved when the material ratio was 12.3270 grams of eggshell, with a contact time of 47.1281 at a pH of 1.71281. The best results were obtained in sample 5 with a biosorbent ratio of 11.25:3.75, contact time of 50 minutes, and initial pH 2 with a decrease in COD levels of 77%.
Optimization and Characterization of Physical–Mechanical Properties of Biodegradable Edible Films Based on Pectin from Breadfruit Peel for Food Packaging Mappamadeng, Andi Hidayatullah; Amalia, Rizka
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14175

Abstract

This study aims to determine the characteristics and optimization of biodegradable films based on pectin from breadfruit peel. The study was employed using a factorial design with multiple variables: pectin (2 and 4 grams), sorbitol concentration (10% and 20%) and drying temperature (1200C and 1400C) were studied. The results obtained from eight samples showed that the water vapor transmission rate was in the range of 3.525 - 6.952 g/m2.day. The best-achieved water vapor transmission rate (3,525 g/m2.day) was obtained at specific operating conditions, namely 4 grams of pectin, 20% of sorbitol concentration and drying temperature of 1400C. In this study, the most influential factor for water vapor transmission rate is pectin weight with the value effect of -1.238. The highest tensile strength test and percentage elongation were 116.55 kgf/cm2 and 10%, respectively. The FTIR analysis showed that the pectin from breadfruit peel was according to commercial pectin standard, by the presence of OH and ester (COOH) groups. The SEM Analysis showed  that the molecular structure of edible films did not look porous, dense, but not flat on its surface, thus less permeable to air.
Formulation of Antibacterial Liquid Soap Based on Virgin Coconut Oil with Various Concentrations of Carica Concentrate and Potassium Hydroxide Volume Dianti, Siti; Kusumayanti, Heny
Journal of Vocational Studies on Applied Research Volume 4, Issue 1, Year 2022 (April 2022)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v4i1.14140

Abstract

Carica is one of the main commodities in Dieng, Central Java. It contains vitamin A, vitamin C, and antibacterial substances such as flavonoid, polifenol, and tannin. Due to its content, carica can be used as an additive for soap products.  Soap is one of the cosmetic products, produced from the saponification reaction between alkali and fatty acids. Carica liquid soap was carried out by  reacting KOH with virgin coconut oil that contains fatty acids, then adding carica fruit juice and other ingredients. The product of liquid soap will be analyzed including pH, density, free fatty acids content, organoleptic test, and antibacterial activity. The research method used is a factorial design. Research has shown that the carica liquid soap were in accordance with SNI 06-4075-1996 and SNI 06-3532-1994. The best quality of  carica liquid soap obtained at pH 11, density 1,0266, and free fatty acid content of 0,082%. Antibacterial activity was carried out using the paper disk method, showing that the antibacterial activity of the soap has a weak performances with an inhibition zone of 1,25 mm. The organoleptic test showed that panelist’s preference for carica liquid soap was low.

Page 4 of 8 | Total Record : 75

 2   3   4   5   6 

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