Physicochemical properties, surface morphology and particle size distribution of precipitated silicas

2003 ◽  
Vol 35 (11) ◽  
pp. 914-921 ◽  
Author(s):  
Jolanta ?urawska ◽  
Andrzej Krysztafkiewicz ◽  
Teofil Jesionowski
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Surface Morphology ◽  
Physicochemical Properties ◽  
Size Distribution

scholarly journals Physicochemical Properties and Resistant Starch Content of Corn Tortilla Flours Refrigerated at Different Storage Times

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 469
Author(s):  
Isela Rojas-Molina ◽  
Monsserrat Mendoza-Avila ◽  
María de los Ángeles Cornejo-Villegas ◽  
Alicia Del Real-López ◽  
Eric Rivera-Muñoz ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physicochemical Properties ◽  
Size Distribution ◽  
Resistant Starch ◽  
Water Solubility ◽  
Corn Starch ◽  
Starch Content ◽  
Type I ◽  
Corn Tortilla

The tortilla is a foodstuff that has a short shelf-life, causing great losses to the industry. The objective of this work was to evaluate, for the first time, the physicochemical properties and resistant starch (RS) content of flours. These were obtained from nixtamalized corn tortillas made with traditional and industrial (commercial) methods, stored at 4 °C for 7, 15, and 30 days. The flours were characterized by measuring particle size distribution, color, water absorption index (WAI), water solubility index (WSI), viscosity, calcium, and RS content. Additionally, chemical proximate analysis, scanning electron microscopy (SEM), and thermal analysis were conducted. Storage at 4 °C increased the friability of tortillas and shifted the particle size distribution toward a greater content of coarse particles in corn tortilla flours. The commercial corn tortilla flours showed higher WAI and WSI values than the traditional corn tortilla flours. On the other hand, the traditional corn tortilla flours exhibited higher RS content values than commercial corn tortilla flours as well as peak viscosity. X-ray diffractograms revealed the presence of amylose-lipid complexes (RS5) in experimental samples. The thermograms evidenced three endotherms corresponding to corn starch gelatinization and melting of type I and type II amylose–lipid complexes.

scholarly journals Producing High-Dose Liqui-Tablet (Ketoprofen 100 mg) for Enhanced Drug Release Using Novel Liqui-Mass Technology

2021 ◽  
Author(s):  
Matthew Lam ◽  
Ali Nokhodchi
Keyword(s):  
Particle Size ◽  
Quality Control ◽  
Drug Release ◽  
Particle Size Distribution ◽  
Physicochemical Properties ◽  
Size Distribution ◽  
Dosage Form ◽  
High Dose ◽  
Solubility Test ◽  
Tablet Hardness

Abstract Purpose Liqui-Tablet is a dosage form derived from Liqui-Mass technology. It has proven to be a promising approach to improve drug dissolution rate of poorly water-soluble drugs. So far, Liqui-Tablet is feasible for low-dose drugs. In this study, an attempt was made to produce high-dose Liqui-Tablet, whilst maintaining ideal physicochemical properties for ease of manufacturing. Methods Liqui-Tablets containing 100 mg of ketoprofen were produced using various liquid vehicles including PEG 200, Span 80, Kolliphor EL, PG, and Tween 85. Investigations that were carried out included saturation solubility test, dissolution test, tomographic study, and typical quality control tests for assessing flowability, particle size distribution, friability, and tablet hardness. Results The weight of these Liqui-Tablets was acceptable for swallowing (483.8 mg), and the saturation solubility test showed PEG 200 to be the most suitable liquid vehicle (493 mg/mL). Tests investigating physicochemical properties such as flowability, particle size distribution, friability, and tablet hardness have shown no issue concerning quality control and manufacturability. The drug release test of the best formulation has shown extremely rapid drug release at pH 7.4 (100% after 5 min). At pH 1.2 the drug release was reasonable considering the formulation was yet to be optimized. Conclusion Despite the high amount of API and liquid vehicle, it is possible to produce a high-dose dosage form with acceptable size and weight for swallowing using the novel Liqui-Mass technology. This has the potential to diversify the technology by removing the restriction of high dose drug that has been seen in liquisolid technology.

scholarly journals Particle Size Distribution and Physicochemical Properties of Pellets Made of Straw, Hay, and Their Blends

2018 ◽  
Vol 11 (1) ◽  
pp. 63-75 ◽  
Author(s):  
Aleksander Lisowski ◽  
Patryk Matkowski ◽  
Magdalena Dąbrowska ◽  
Michał Piątek ◽  
Adam Świętochowski ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physicochemical Properties ◽  
Size Distribution

A lithiation/delithiation mechanism of monodispersed MSn5 (M = Fe, Co and FeCo) nanospheres

2015 ◽  
Vol 3 (13) ◽  
pp. 7170-7178 ◽  
Author(s):  
Fengxia Xin ◽  
Xiaoliang Wang ◽  
Jianming Bai ◽  
Wen Wen ◽  
Huajun Tian ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Reaction Mechanism ◽  
Particle Size Distribution ◽  
Surface Morphology ◽  
Electrochemical Performance ◽  
Size Distribution ◽  
Identical Particle ◽  
Particle Surface ◽  
Thermodynamics And Kinetics

The same crystal structure, identical particle surface morphology and the similar particle size distribution of MSn5 (M = Fe, Co and FeCo) phases are ideal for comparison of the electrochemical performance, reaction mechanism, thermodynamics and kinetics.

Comparative Study of Physicochemical Properties of Dragon’s Blood Powders

2011 ◽  
Vol 311-313 ◽  
pp. 560-565 ◽  
Author(s):  
Guo Wei Zhao ◽  
Chun Liu Wang ◽  
Zheng Gen Liao ◽  
Xin Li Liang ◽  
Yun Chao Cao ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physicochemical Properties ◽  
Size Distribution ◽  
Moisture Absorption ◽  
Fine Powder ◽  
Ultrafine Powder ◽  
Ultrafine Powders ◽  
Dragon’S Blood ◽  
Significant Difference

Compare investigate physicochemical properties of fine powder and two ultrafine powders of Dragon’s Blood, and then to determinate particle size distribution for ultrafine powders of Dragon’s Blood. Specific surface area and porosity, surface morphology and moisture absorption of Dragon’s Blood powders were investigated. The content and the in vitro dissolution of dracorhodin in Dragon’s Blood powders were determined by HPLC. The results showed that the content of dracorhodin had no significant difference among three Dragon’s Blood powders. With the decreasing of particle size the degree of moisture decreased. The dissolution of dracorhodin in the order of: ultrafine powder I > ultrafine powder II > fine powder. An appropriate degree of superfine grinding can improve moisture absorption of Dragon’s Blood powders and dissolution of dracorhodin. Particle size distribution of Dragon’s Blood ultrafine powder should be controlled about 40 μm.

Sign in / Sign up

Export Citation Format

Share Document