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All Journal Biology, Medicine, & Natural Product Chemistry
Endaruji Sedyadi
Sunan Kalijaga State Islamic University Yogyakarta
Biochemistry, Genetics & Molecular Biology Medicine & Pharmacology Public Health

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Effect of Addition of Soursop Leaf Extract to Ganyong (Canna edulis Ker.) Starch Edible Film and its application in Red Grape Storage Time Erni Widyastuti; Endaruji Sedyadi; Susy Yunita Prabawati
Biology, Medicine, & Natural Product Chemistry Vol 5, No 2 (2016)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.009 KB) | DOI: 10.14421/biomedich.2016.52.55-59

Abstract

This study aimed to determine the effect of addition of Soursop leaf extract to  edible film and its effect on the storage time of red grapes. This research had three main steps, soursop leaf extraction, edible film making, and application on red grapes storage time. Soursop leaves extract variation used in this research are 0.5; 1; and 1.5% (w/w total) and the best result was used to coat the red grapes. The results showed that the optimum composition was obtained on the edible film with the addition of 0.5% (w/w total) soursop leaf extract. The composition increased film thickness from 0.03 to 0.08 mm, decreased film’s tensile strength from 11.89 to 8.42 MPa, decreased elongation from 12.71 to 11.03%, decreased the Young Modulus from 0.935 to 0.764 MPa, and decreased the vapor transmission rate from 7.45 to 6.55 g/m2.hour. The 50% shrinkage of weight and 50% texture damage are used as parameters to measure the Red grapes storage time. Based on weight shrinkage, red grapes storage time change from 24 days to 29 days by using an edible film coating without addition of extract, an extend to 32 days while using an edible film coating with addition of soursop leaf extract. Based on texture damage, red grapes storage time increased from 13 to 41 days if using an edible film coating without addition of extract, and increased to 40 days using an edible film coating with the addition of soursop leaf extract.
The Effect of Cassava Peel Starch Addition to Bioplastic Biodegradation Based On Chitosan On Soil and River Water Media Mahfud Syuhada; Sintia Ainus Sofa; Endaruji Sedyadi
Biology, Medicine, & Natural Product Chemistry Vol 9, No 1 (2020)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/biomedich.2020.91.7-13

Abstract

The study of the relationship between starch addition to biodegradation of bioplastics has been carried out. This study aims to understand the biodegradability of chitosan-based bioplastics with additional cassava peel starch on soil and river water media. This research was conducted through four stages, namely making starch from cassava peel waste, making bioplastics using the blending and castingwet processes method with variations of starch 5, 10, 15 and 20 ml. Testing physical mechanical properties including water resistance, thickness, tensile strength, elongation, and modulus young. Testing the characteristics of bioplastics functional groups was carried out using FTIR (Fourier Transform Infrared) and biodegradation testing of bioplastics carried out on soil and river water media. The results of bioplastics research with variation 5 ml produce good mechanical physical properties. Bioplastics produced water resistance value of 45.03%, thickness of 0.0190 mm, tensile strength of 49.93 MPa, elongation of 3.068% and Young modulus of 1627.63 MPa. Bioplastics biodegradation test was observed by measuring the decrease in sample mass. The biodegradation test results in soil and river water media respectively showed a decrease in bioplastic mass up to 63% and 54%. The biodegradation rate of the calculation results on soil media is −0,1502 and in river water media is −0,0948.
Krokot (Portulaca oleracea L) As a Natural Sensitizer for TiO2 Dye-sensitized Solar Cells: The Effect of Temperature Extract Reyza Anni Mufidah; Khamidinal Khamidinal; Endaruji Sedyadi; Didik Krisdiyanto
Biology, Medicine, & Natural Product Chemistry Vol 4, No 2 (2015)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (901.766 KB) | DOI: 10.14421/biomedich.2015.42.25-29

Abstract

The solar cell is formed by a sandwich structure, in which two electrodes flank the primary electrolyte that is containing redox I-/based on PEG (Polyethylene Glycol). The working-electrode which is TiO2 layer on an ITO glass substrate is sensitized with krokot dye as the electron donor. The counter electrode is a layer of carbon. The fabrication cell is immersed with the krokot dye with 40°C, 50°C, 60°C extract temperature. The result of the UV-Vis shows that the absorption of wave-length from dye extract of krokot is located in the visible region with the absorbance peak in 420,5 nm and 665,5 nm which are the peak of chlorophyll. For the UV-Vis solid system, there are the highest band gap  in  50°C extract temperature that make the capability of absorption toward UV spectrum is large. Furthermore, in the functional group analysed by FT-IR, there are shiften-carbonil and hydroxyl group after they are sensitized. From the current and voltage test with I-V meter keithley 2400 is resulted that on the 50°C extract temperature produces the highest efficiency of reaches which is 2.63 x 10-3 %.
Co-Authors Didik Krisdiyanto Erni Widyastuti Khamidinal Khamidinal Mahfud Syuhada Reyza Anni Mufidah Sintia Ainus Sofa Susy Yunita Prabawati