Effect of high power ultrasound on physical–chemical properties of polypropylene films aimed for food packaging: structure and surface features

2018 ◽  
Vol 76 (2) ◽  
pp. 1007-1021 ◽  
Author(s):  
Mario Ščetar ◽  
Mia Kurek ◽  
Anet Režek Jambrak ◽  
Frédéric Debeaufort ◽  
Kata Galić
Keyword(s):  
High Power ◽  
Food Packaging ◽  
Chemical Properties ◽  
Power Ultrasound ◽  
Surface Features ◽  
Physical Chemical ◽  
High Power Ultrasound ◽  
Polypropylene Films ◽  
Packaging Structure

Influence of high power ultrasound on physical-chemical properties of polypropylene films aimed for food packaging: barrier and contact angle features

2017 ◽  
Vol 66 (11) ◽  
pp. 1572-1578 ◽  
Author(s):  
Mario Ščetar ◽  
Mia Kurek ◽  
Anet Režek Jambrak ◽  
Frédéric Debeaufort ◽  
Kata Galić
Keyword(s):  
Contact Angle ◽  
High Power ◽  
Food Packaging ◽  
Chemical Properties ◽  
Power Ultrasound ◽  
Physical Chemical ◽  
High Power Ultrasound ◽  
Polypropylene Films

scholarly journals The Influence of High-Power Ultrasound and Bactofugation on Microbiological Quality of Milk

2021 ◽  
Vol 59 (4) ◽  
Author(s):  
Edita Juraga ◽  
Višnja Stulić ◽  
Tomislava Vukušić Pavičić ◽  
Jasenka Gajdoš Kljusurić ◽  
Mladen Brnčić ◽  
...  
Keyword(s):  
High Power ◽  
Treatment Time ◽  
Microbiological Quality ◽  
Chemical Properties ◽  
Cow Milk ◽  
Power Ultrasound ◽  
Increased Temperature ◽  
High Power Ultrasound ◽  
Temperature Levels ◽  
Quality Of Milk

Research background. The application of high power ultrasound, combined with a slightly increased temperature on raw whole cow milk, skimmed cow milk, and skimmed cow milk that passed the bactofugation process were analyzed. A combination of those techniques, ultrasound and the bactofugation of milk was conducted to achieve the microbiological accuracy that is usually achieved by the pasteurization process. Experimental approach. The milk samples (200 mL) were treated for 2.5, 5, 7.5 and 10 minutes with high-power ultrasound (200 W and 400 W) with a frequency of 24 kHz. The treatments were conducted with a constant duty cycle of 100 %. Temperature levels during the treatments were 20 °C, and 55 °C. The count of somatic cells was analyzed for the aerobic mesophilic bacteria, as well the number of Enterobacteriaceae, Escherichia coli, and Staphylococcus aureus cells. Results and conclusions. The best result from the perspective of the reduction of the total count of bacteria was achieved by high-power ultrasound with a power of 400 W treated for 10 minutes. High reduction of Enterobacteriaceae, E. coli, and S. aureus cells was achieved in ultrasound treatment of raw whole, skimmed, and skimmed cow milk with a power of 200 and 400 W regardless of a treatment time. Novelty and scientific contribution: High-power ultrasound with a combination of bactofugation as a pretreatment for milk and with a slightly increased temperature (up to 55 °C) is much more economical than the pasteurization process, while it preserves the sensory and physical-chemical properties of milk.

scholarly journals Synthesis and Characterization of Nano-Sized 4-Aminosalicylic Acid–Sulfamethazine Cocrystals

Pharmaceutics ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 277 ◽  
Author(s):  
Ala’ Salem ◽  
Anna Takácsi-Nagy ◽  
Sándor Nagy ◽  
Alexandra Hagymási ◽  
Fruzsina Gősi ◽  
...  
Keyword(s):  
High Power ◽  
Active Pharmaceutical Ingredient ◽  
Polymorphic Form ◽  
Degree Of Crystallinity ◽  
Dissolution Enhancement ◽  
Aminosalicylic Acid ◽  
Nano Technology ◽  
Power Ultrasound ◽  
High Power Ultrasound ◽  
High Degree

Drug–drug cocrystals are formulated to produce combined medication, not just to modulate active pharmaceutical ingredient (API) properties. Nano-crystals adjust the pharmacokinetic properties and enhance the dissolution of APIs. Nano-cocrystals seem to enhance API properties by combining the benefits of both technologies. Despite the promising opportunities of nano-sized cocrystals, the research at the interface of nano-technology and cocrystals has, however, been described to be in its infancy. In this study, high-pressure homogenization (HPH) and high-power ultrasound were used to prepare nano-sized cocrystals of 4-aminosalysilic acid and sulfamethazine in order to establish differences between the two methods in terms of cocrystal size, morphology, polymorphic form, and dissolution rate enhancement. It was found that both methods resulted in the formation of form I cocrystals with a high degree of crystallinity. HPH yielded nano-sized cocrystals, while those prepared by high-power ultrasound were in the micro-size range. Furthermore, HPH produced smaller-size cocrystals with a narrow size distribution when a higher pressure was used. Cocrystals appeared to be needle-like when prepared by HPH compared to those prepared by high-power ultrasound, which had a different morphology. The highest dissolution enhancement was observed in cocrystals prepared by HPH; however, both micro- and nano-sized cocrystals enhanced the dissolution of sulfamethazine.

scholarly journals High‐power ultrasound measurement

1995 ◽  
Vol 98 (5) ◽  
pp. 2917-2917
Author(s):  
G. S. K. Wong ◽  
L. Wu
Keyword(s):  
High Power ◽  
Ultrasound Measurement ◽  
Power Ultrasound ◽  
High Power Ultrasound

Particle Size Distribution of ZrO2:Pr3+ – Influences of pH, High Power Ultrasound, Surfactant and Dopant Quantity

2007 ◽  
Vol 128 ◽  
pp. 97-100 ◽  
Author(s):  
Stephanie Möller ◽  
Janusz D. Fidelus ◽  
Witold Łojkowski
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Power ◽  
Average Particle Size ◽  
Sodium Dodecyl ◽  
Average Particle ◽  
Power Ultrasound ◽  
High Power Ultrasound ◽  
Influence Of Ph

The aim of the work was to examine the influence of pH, high power ultrasound, surfactant and dopant quantity on the particle size distribution of ZrO2:Pr3+, with praseodymium content varying between 0.05 and 10 %. The nanopowders were obtained via a hydrothermal microwave driven process. To establish if the dopant was located on the surface of the zirconia nanoparticles, the particle size distribution, as a function of pH, was measured to obtain an estimate of the isoelectric point of the samples. All results indicated that the dopant was concentrated on the surface: the measurements of the particle size distribution show that the pH corresponding to maximum average particle size changes towards higher values when the Pr content increases. Measurements of the particle size distribution dependency on the application of high power ultrasound and the addition of the sodium dodecyl sulphate surfactant show that, under certain conditions, there is a better stabilisation of the nanopowders in a dispersion and undesirable agglomeration is hindered.

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