scholarly journals Catechin Extracted from Uncaria gambier Roxb for Nanocatechin Production: Physical and Chemical Properties

2021 ◽  
Vol 16 (4) ◽  
pp. 393-399
Author(s):  
Yefsi Malrianti ◽  
Anwar Kasim ◽  
Alfi Asben ◽  
Edi Syafri ◽  
Gustri Yeni ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
High Speed ◽  
Chemical Properties ◽  
Spray Dryer ◽  
Physical And Chemical Properties ◽  
Rotational Angle ◽  
Degradation Temperature ◽  
Successive Extraction ◽  
Physical And Chemical ◽  
And Chemical Properties

This research reports nanoparticles or nanocatechin produced from catechin extracted from gambier and the differences between the properties of the extracted catechin and nanocatechin. The study began with the preparation of >95% pure catechin through successive extraction. The catechin obtained was converted to nanocatechin with a high-speed homogenizer on a 1% suspension of catechin in water at 12,000 rpm for 30, 45, 60, 75 or 90 minutes. Results showed average diameters of the nanocatechin 90-minute homogenized colloids were then dried with a spray dryer so physical and chemical properties could be compared with those of the raw extracted catechin. Catechin content, water content, pH, refractive index, density, molecular weight and rotational angle were unaltered. Appearance, solubility, thermal properties, highest absorbance wavelength and antioxidant activity were measured. Initial degradation temperature and antioxidant activity of nanocatechin were higher than those in the originally extracted catechin.

Local Halide Distributions in High-Speed Tabular Ag(Br,I) Emulsion Microcrystals by Cryo-FEG-AEM

2001 ◽  
Vol 7 (S2) ◽  
pp. 520-521
Author(s):  
V. Oleshko ◽  
P. Crozier ◽  
L. Garone ◽  
J. Freedman
Keyword(s):  
Solid State ◽  
High Speed ◽  
Information Technologies ◽  
Chemical Properties ◽  
Imaging Systems ◽  
Physical And Chemical Properties ◽  
Electronic Imaging ◽  
Physical And Chemical ◽  
Made In ◽  
And Chemical Properties

The unique physical and chemical properties of AgX (X=C1, Br, I) emulsion microcrystals (optical, solid state, transport, chemical and spectral sensitizations and development) account for their use as basic light quanta detectors in practical photography for over 150 years. in spite of the advances made in other recording systems, especially in electronic imaging, contemporary AgX-based photographic materials are still superior in sensitivity and resolution. Although the replacement of AgX-based imaging systems by electronic imaging was already predicted 20 years ago, their current world manufacturing level is now larger than ever. However, in order to be successfully incorporated into digital and hybrid information technologies for the new Millennium, AgX-based photographic materials should further improve their quantum efficiency and image quality. in order to achieve these objectives, the key components should be intentionally modified with a focus primarily at the nanostructural level.

scholarly journals Physico-Chemical Properties And Antioxidant Activities of Rhodomytus tomentosa syrup

2021 ◽  
Vol 2 (01) ◽  
pp. 19-24
Author(s):  
Widia Dara ◽  
Nurhamidah Nurhamidah
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Chemical Properties ◽  
Total Dissolved Solids ◽  
Physical And Chemical Properties ◽  
Total Acid ◽  
Physico Chemical ◽  
Physical And Chemical ◽  
Rhodomyrtus Tomentosa ◽  
And Chemical Properties

 Antioxidants are natural compounds found in many fruits, as well as in Rhodomyrtus tomentosa. The research, Rhodomyrtus tomentosa will be processed in form of syrup. The results of the organoleptic test of syrup ranged from like to  very like by panelists. Determine the  physical and chemical properties on syrup Rhodomyrtus tomentosa were acidity value is 4,41, total acid is 0,003%, total dissolved solids 23,74oBrix and sugar level of syrup is 21%.  The results of Vitamin C content analysis of 1.25 mg / 100 g. The syrup contains Fe 0.525 mg / L and Cu 0.220 mg / L. In the Rhodomyrtus tomentosa  syrup there is no lead (Pb), cadmium (Cd),  Mercuri (Hg), Arsenic (As) and  Stanum (Sn) metal. The content of antioxidant activity sirup  is 10.31 %.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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