scholarly journals SINTESIS DAN KARAKTERISASI SIFAT OPTIK POLIMER FILM PVA-TCA-MB

2017 ◽  
Vol 3 (2) ◽  
pp. 257
Author(s):  
Jannatin `Ardhuha ◽  
Ni Nyoman Sri Putu Verawati ◽  
Muhammad Taufik ◽  
Syahrial Ayub
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Absorption Spectrum ◽  
Optical Property ◽  
Polyvinyl Alcohol ◽  
Trichloroacetic Acid ◽  
Storage Time ◽  
Purple Colour ◽  
And Storage

Polyvinyl alcohol (PVA) based film polymers that contain trichloroacetic acid (TCA) and methylene blue (MB) dye has been synthesized. The synthesis aimed to obtain material that can be applied as film dosimeter. Six PVA-TCA-MB thin film samples have been synthsized by varying PVA grades and TCA composition. Characterization of optical property of the resulted polymer was undertaken by measuring samples absorption within wavelength range of 200 nm to 700 nm.  Absorption spectrum of samples showed an optimum between 547-644 nm that corresponds to purple colour and characteristic to MB absoption. Further analysis showed the influence of TCA concentration and storage periode of the polymer. Optimization of syntesis by evaluating synthesis condition, heating and storage time is yet to be done in order to obtain polymer that can be used as dosimeter with reproducible optical property.

Preparation and characterization of natural rubber bio-based wood adhesive: effect of total solid content, viscosity, and storage time

2019 ◽  
Vol 77 (5) ◽  
pp. 2737-2747 ◽  
Author(s):  
Siriwat Radabutra ◽  
Pongtanawat Khemthong ◽  
Sayant Saengsuwan ◽  
Sasiwimon Sangya
Keyword(s):  
Natural Rubber ◽  
Storage Time ◽  
Total Solid ◽  
Wood Adhesive ◽  
Solid Content ◽  
Total Solid Content ◽  
Adhesive Effect ◽  
And Storage

scholarly journals PEMANFAATAN KITOSAN DARI CANGKANG BEKICOT (Achatina fulica) SEBAGAI PENGAWET IKAN KEMBUNG (Rastrelliger sp) DAN IKAN LELE (Clarias batrachus)

2015 ◽  
Vol 3 (4) ◽  
pp. 51-57
Author(s):  
Sari Wahyu Waryani ◽  
Rika Silvia ◽  
Farida Hanum
Keyword(s):  
Storage Time ◽  
Chitosan Solution ◽  
Clarias Batrachus ◽  
Antimicrobial Compounds ◽  
Optimal Conditions ◽  
Achatina Fulica ◽  
Total Volatile ◽  
And Storage

The efforts that should be made to maintain the quality of fish is by using antimicrobial compounds, one of which is chitosan. In this research, characterization of chitosan from shell snail (Achatina fulica) has a water content of 5.07%, ash content of 1.8% and the degree of deacetylation (DD) 75.13%. The use of chitosan in this study was to determine the optimal conditions on chitosan concentration and storage time of mackerel (Rastrelliger sp) and catfish (Clarias batrachus) from the microbiological and organoleptic aspects. This research used a variation of the concentration of chitosan was 1%, 1.5%, 2% and 2.5% dissolved in 1% acetic acid. Observations were do with variation the storage time 10 hours, 15 hours, 20 hours and 25 hours and the provision of chitosan solution by soaking and spraying with the observation parameters Total Volatile Base (TVB), organoleptic and pH of fish. Based on the analysis, the results showed that the maximum concentration of chitosan on mackerel (Rastrelliger sp) and catfish (Clarias batrachus) is 1,5% and treatment by means of immersion is the best treatment. The use of chitosan solution on mackerel (Rastrelliger sp) survived 20 hours while catfish (Clarias batrachus) survived 15 hours.

scholarly journals Extraction and Characterization of Urease from Durio zibethinus L

2021 ◽  
Vol 7 (2) ◽  
pp. 158-167
Author(s):  
Zusfahair Zusfahair ◽  
Amin Fatoni ◽  
Dian Riana Ningsih ◽  
Mardiyah Kurniasih
Keyword(s):  
Reaction Time ◽  
Metal Ion ◽  
Storage Time ◽  
Incubation Temperature ◽  
Enzymatic Reaction ◽  
Test Analysis ◽  
Germination Time ◽  
Durio Zibethinus ◽  
And Storage

Urease is a biocatalyst that serves to hydrolyze urea into ammonia and carbon dioxide. Since it is an imported product, the price of urea is still high. Urease can be found in grains. One of the grains that has not been explored for its urease content is durian (Durio zibethinus L.) seeds. This study aims to determine the effect of germination time on the activity of urease from durian seeds and its characteristics including the effect of pH, incubation temperature, enzymatic reaction time, addition of EDTA and metals, and storage time on the activity of urease from durian seeds. The first step of this study was seed germination which was carried out in the dark for 0, 3, 5, 7, and 9 days. Durian seed sprouts were extracted by mashing them using a mortar and pestle. They were then homogenized using a stirrer and centrifuged in a cold state. The crude urease extract obtained was then tested for its activity using the Nessler method. The acquired data was tested statistically using ANOVA. The results showed that the activity of urease from durian seeds was optimum at 3-day germination time, pH 7, incubation temperature at 30 °C, and 15-minute enzymatic reaction time with an activity of 163.6 U/mL. Urease is a metalloenzyme with its inhibitor being the Cu2+ and Na+ metal ions and its activator being Ba2+ metal ion. Tukey's test analysis showed that the effect of urease storage time at 4 °C resulted in a stable urease activity for 8 days while at room temperature it decreased its activity significantly to 72.8%.

scholarly journals Characterization of Tifton 85 bermudagrass haylage with different layers of polyethylene film and storage time

2018 ◽  
Vol 31 (8) ◽  
pp. 1197-1204
Author(s):  
Caroline Daiane Nath ◽  
Marcela Abbado Neres ◽  
Kácia Carine Scheidt ◽  
Luciano dos Santos Bersot ◽  
Samantha Mariana Monteiro Sunahara ◽  
...  
Keyword(s):  
Storage Time ◽  
Polyethylene Film ◽  
And Storage

scholarly journals Degradation of Methylene Blue Using Cadmium Sulfide Photoanode in Photofuel Cell System with Variation of Electrolytes

2020 ◽  
Vol 21 (1) ◽  
pp. 97
Author(s):  
Gunawan Gunawan ◽  
Abdul Haris ◽  
Didik Setiyo Widodo ◽  
Linda Suyati ◽  
Wilman Septina
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Cadmium Sulfide ◽  
Cell System ◽  
Electrode System ◽  
Sem Image ◽  
Cds Thin Film ◽  
Type Semiconductor ◽  
Blue Solution

Methylene blue degradation carried out using cadmium sulfide (CdS) photoanode in photofuel cell (PFC) had been done. CdS synthesized by chemical bath deposition (CBD) on the FTO substrate was used as anode and platinum as a cathode in photoelectrochemical studies. Characterization of CdS thin film was done using EDX, XRD, SEM, Raman, UV-Vis absorption spectrophotometer as well as photocurrent test of the CdS thin film under illumination using potentiostat with the three-electrode system. The EDX result indicated the presence of CdS with an elemental composition of Cd rich. XRD showed the appearance of CdS crystals in cubic and hexagonal formations. SEM image of CdS gave results in the form of crystals of less than 1 mm. Raman spectrum showed the appearance of CdS peaks. The bandgap of CdS was estimated to be 2.38 eV, and the photocurrent test confirmed that the film had a property of n-type semiconductor. Application of CdS thin film as a photoanode in the PFC system using 100 mg/L methylene blue solution showed degradation up to 48% for 2.5 h using a 4 cm2 photoanode, and the maximum potential of 0.8 V was obtained with a photoanode area of 1 cm2. 

scholarly journals Physicochemical and Nutritional Characterization of Jamun (Syzygium Cuminii)

2017 ◽  
Vol 5 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Payel Ghosh ◽  
Rama Pradhan ◽  
Sabyasachi Mishra ◽  
Avinash Singh ◽  
Abhijit Kar
Keyword(s):  
Mechanical Property ◽  
Seed Weight ◽  
Market Value ◽  
Good Source ◽  
Purple Colour ◽  
Good Market ◽  
Market Sample ◽  
And Storage ◽  
Syzygium Cuminii

Jamun (Syzygium cuminii) is an important minor fruits in India. Minor fruits are good source of nutrition and pharmaceuticals properties. Among all minor fruits Jamun is highly perishable but nutritious. It is mainly used for diabetes patients and in the pharmaceuticals industries. It is a good source of anthocyanin, effective against the analgesic properties. There is no proper data available for the Indian Jamun. The fruit is having a very good market value, but due to its unavailability and perishability it is still unexploited. Physicochemical, mechanical and sensory properties had been investigated for Jamun fruit as well as seed in this paper for further use and storage. Weight of the whole fruit was 8.99±1.89gm whereas the seed weight was 1.64±0.21gm. In case of mechanical property whole fruit can be penetrated up-to 4.1mm whereas, at the same load for seed it can penetrate up-to 2.53mm. Purple colour for pulp, juice and whole fruit was -9.7, -0.9, and -0.76 respectively. High amount of polyphenol (203.76±9.84, 386.51±10.25) tannin (94.52±9.19, 388.99±7.34) and anthocyanin (195.58±6.15, 18.47±1.99) present in both fruit and seed. In case of minerals, presence of K, Ca and Na are significant. In case of sensory analysis mouthfeel and colour was good compared to market sample. This study is helpful for the postharvest processing, machine designing and for further analysis of Jamun.

Fabrication and Characterization of Methylene-Blue-Doped Polyvinyl Alcohol-Polyacrylic Acid Blend for Holographic Recording

2004 ◽  
Vol 43 (18) ◽  
pp. 3697 ◽  
Author(s):  
Mythili Ushamani ◽  
Krishnapillai Sreekumar ◽  
Cheranellore S. Kartha ◽  
Rani Joseph
Keyword(s):  
Methylene Blue ◽  
Polyvinyl Alcohol ◽  
Polyacrylic Acid ◽  
Holographic Recording ◽  
Fabrication And Characterization

Characterization of Y-Ba-Cu-O films grown on silicon substrates by sequential evaporation

1988 ◽  
Vol 46 ◽  
pp. 866-867
Author(s):  
E. L. Hall ◽  
A. Mogro-Campero ◽  
L. G. Turner ◽  
N. Lewis
Keyword(s):  
Thin Film ◽  
Thin Film Deposition ◽  
Superconducting Films ◽  
Electron Beam Evaporation ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Superconducting Properties ◽  
Sequential Electron ◽  
Thin Superconducting Films

There is great interest in the growth of thin superconducting films of YBa2Cu3Ox on silicon, since this is a necessary first step in the use of this superconductor in a variety of possible electronic applications including interconnects and hybrid semiconductor/superconductor devices. However, initial experiments in this area showed that drastic interdiffusion of Si into the superconductor occurred during annealing if the Y-Ba-Cu-O was deposited direcdy on Si or SiO2, and this interdiffusion destroyed the superconducting properties. This paper describes the results of the use of a zirconia buffer layer as a diffusion barrier in the growth of thin YBa2Cu3Ox films on Si. A more complete description of the growth and characterization of these films will be published elsewhere.Thin film deposition was carried out by sequential electron beam evaporation in vacuum onto clean or oxidized single crystal Si wafers. The first layer evaporated was 0.4 μm of zirconia.

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