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 Influence of Particle Charge and Size Distribution on Triboelectric Separation—New Evidence Revealed by In Situ Particle Size Measurements

Processes ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 381 ◽  
Author(s):  
Johann Landauer ◽  
Petra Foerst
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Starch Content ◽  
Dynamics Simulation ◽  
Height Distribution ◽  
Particle Charge ◽  
Separation Chamber ◽  
Triboelectric Charging

Triboelectric charging is a potentially suitable tool for separating fine dry powders, but the charging process is not yet completely understood. Although physical descriptions of triboelectric charging have been proposed, these proposals generally assume the standard conditions of particles and surfaces without considering dispersity. To better understand the influence of particle charge on particle size distribution, we determined the in situ particle size in a protein–starch mixture injected into a separation chamber. The particle size distribution of the mixture was determined near the electrodes at different distances from the separation chamber inlet. The particle size decreased along both electrodes, indicating a higher protein than starch content near the electrodes. Moreover, the height distribution of the powder deposition and protein content along the electrodes were determined in further experiments, and the minimum charge of a particle that ensures its separation in a given region of the separation chamber was determined in a computational fluid dynamics simulation. According to the results, the charge on the particles is distributed and apparently independent of particle size.

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

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.

scholarly journals Effect of Adjusting for Particle-Size Distribution of Cement on Strength Development of Concrete

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Daegeon Kim
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Power Plants ◽  
Setting Time ◽  
Strength Development ◽  
Cement Particle ◽  
Type I ◽  
Compression Tests ◽  
Batch Plants

The massive construction projects such as nuclear power plants and gas storage plants operate their own batch plants for appropriate supply of a massive amount of ASTM Type I cement. The batch plants have difficulty responding to diversifying consumer requirements such as early strength development of concrete under the current limited production line of cement. In order to respond to the needs, this study collected several sizes of cement particles from different filters at a cement plant, and conducted the adjustment of cement particle-size distribution to enhance the properties of concrete based on ASTM Type I cement. This paper shows the chemical properties and physical tests such as setting time and compression tests considering the effects of the distribution of cement particles. Also, the classification based on cement particle-size distribution was defined as FMC (fineness modulus of cement). As FMC increased, compressive strength was relatively low at early age but the difference became smaller for later age. The test results show the effects of the adjusted mix proportion considering particle-size distribution of cement on strength development of concrete. Therefore, it is possible to see that customized cement or concrete can be manufactured in response to various consumer requirements by introducing such method that by-passes and collects fine or coarse cement in the cement-crushing process and then re-mixes them with OPC ASTM Type I cement depending on FMC.

Study on Physicochemical Properties and Application Prospect of Several Typical Bentonite

2013 ◽  
Vol 333-335 ◽  
pp. 2015-2018
Author(s):  
Tian Li Xue ◽  
Shao Jian Ma ◽  
Lin Ling Jiang ◽  
Xu Yuan Zhang ◽  
Wei Mo
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physicochemical Properties ◽  
Size Distribution ◽  
Mineral Composition ◽  
Standard Methods ◽  
Application Field ◽  
Development And Utilization ◽  
Application Prospects ◽  
Better Than

Four kinds of bentonite samples were studied in this paper. Mainly discussing the particle size distribution, mineral composition and physicochemical properties of bentonite, the aim was to provide a useful reference for the efficient development and utilization of bentonite resources. The results indicated that NM-bent., HB-bent. and EZ-bent. were Ca (Mg)-bentonite while XZJ-bent. was Na-bentonite. The physicochemical properties of bentonite mainly depended on interlayer cations. Many properties indexes of Na-bentonite were better than that of Ca (Mg)-bentonite. Some properties indexes showed a poor reproducibility when tested by standard methods. The natural Na-bentonite has excellent properties and extensive application prospects while Ca (Mg)-bentonite needed for further processing to meet the demand of the application field.

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