scholarly journals Acemannan Gels and Aerogels

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 330
Author(s):  
Daniel Miramon-Ortíz ◽  
Waldo Argüelles-Monal ◽  
Elizabeth Carvajal-Millan ◽  
Yolanda López-Franco ◽  
Francisco Goycoolea ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Chemical Structure ◽  
Spectroscopic Analysis ◽  
Drying Process ◽  
Solvent Treatment ◽  
Surface Areas ◽  
Infrared Spectroscopic Analysis ◽  
Bioactive Properties ◽  
Supercritical Co2 Drying ◽  
Drying Technology

The procedures to obtain two types of acemannan (AC) physical gels and their respective aerogels are reported. The gelation was induced by the diffusion of an alkali or a non-solvent, then supercritical CO2 drying technology was used to remove the solvent out and generate the AC aerogels. Fourier-transform infrared spectroscopic analysis indicated that alkali diffusion produced extensive AC deacetylation. Conversely, the non-solvent treatment did not affect the chemical structure of AC. Both types of gels showed syneresis and the drying process induced further volume reduction. Both aerogels were mesoporous nanostructured materials with pore sizes up to 6.4 nm and specific surface areas over 370 m2/g. The AC physical gels and aerogels enable numerous possibilities of applications, joining the unique features of these materials with the functional and bioactive properties of the AC.

scholarly journals Comparison of Supercritical CO2-Drying, Freeze-Drying and Frying on Sensory Properties of Beetroot

Foods ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1201
Author(s):  
Nikola Tomic ◽  
Ilija Djekic ◽  
Gerard Hofland ◽  
Nada Smigic ◽  
Bozidar Udovicki ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Freeze Drying ◽  
Sensory Quality ◽  
Quality Parameters ◽  
Acceptance Testing ◽  
Drying Methods ◽  
Promising Alternative ◽  
Supercritical Co2 Drying ◽  
Negative Effect ◽  
Drying Technology

The aim of this study was to compare the sensory quality and acceptance of dried ready-to-eat beetroot snacks as a result of different drying methods applied: supercritical CO2-drying (scCO2-drying), frying, and freeze-drying. Descriptive sensory analysis, quality rating (10 assessors), and consumer acceptance testing (n = 102) were performed. Mean overall quality scores within the range of “very good” quality were found only in non-precooked scCO2-dried samples which were characterized by typical magenta color, low level of shape and surface deformations, pronounced brittleness and crispiness, and good rehydration during mastication. The other samples were in the range of “good” quality. The pre-cooking step before scCO2-drying negatively influenced the sensory quality parameters, particularly appearance. Around 60% of tested consumers showed a preference for the fried and non-precooked scCO2-dried samples. The drivers of liking were mostly related to the characteristics of the product, which was salted, fried, and crispy, with an oily and overburnt flavor, i.e., the product most similar to commercial potato chips products. Freeze-drying had a negative effect primarily on appearance and flavor. According to the sensory evaluation conducted, direct scCO2-drying without a pre-cooking step showed itself as a promising alternative drying technology in the production of dried beetroot snacks.

scholarly journals Supercritical CO2 drying of food matrices

2018 ◽  
Author(s):  
S. Spilimbergo ◽  
A. Zambon ◽  
T. M. Vizzotto ◽  
G. Morbiato ◽  
M. Toffoletto ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Supercritical Drying ◽  
Microbial Inactivation ◽  
Process Conditions ◽  
Drying Methods ◽  
Drying Process ◽  
Promising Alternative ◽  
Supercritical Co2 Drying ◽  
Conventional Drying ◽  
Drying Efficiency

This work explore the use of supercritical CO2 drying as alternative technique for the obtainment of pasteurized and high quality dried product. Several tests were conducted on animal, vegetable and fruit matrixes in order to investigate the effectiveness of SC-CO2 drying process at different process conditions. Design of experiment was performed to find the optimal process conditions for vegetable and fruit matrices, using the final water activity of the products as key indicator for the drying efficiency. The inactivation of naturally present microorganisms and inoculated pathogens demonstrated the capability of SC-CO2 drying process to assure a safe product. Moreover, retention of nutrients was compared with conventional drying methods. Results suggest that supercritical drying is a promising alternative technology for food drying. Keywords: supercritical drying; carbon dioxide; food drying; microbial inactivation

Fabrication and characterization of nano-cellulose aerogels via supercritical CO2 drying technology

2016 ◽  
Vol 183 ◽  
pp. 179-182 ◽  
Author(s):  
Xiaoyu Wang ◽  
Yang Zhang ◽  
Hua Jiang ◽  
Yuxuan Song ◽  
Zhaobing Zhou ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Supercritical Co2 Drying ◽  
Nano Cellulose ◽  
Fabrication And Characterization ◽  
Drying Technology

scholarly journals Influence of combined hydrolyzed collagen and maltodextrin as carrier agents in spray drying of cocona pulp

2020 ◽  
Vol 23 ◽  
Author(s):  
Diana Patricia Vargas-Muñoz ◽  
Louise Emy Kurozawa
Keyword(s):  
Particle Size ◽  
Spray Drying ◽  
Chemical Structure ◽  
Particle Diameter ◽  
Spray Dryer ◽  
Drying Process ◽  
Hydrolyzed Collagen ◽  
Bioactive Properties ◽  
Encapsulation Process ◽  
Mean Particle Diameter

Abstract This work aimed to evaluate the effect of carrier agents containing maltodextrin and protein, represented by hydrolyzed collagen on the spray drying process of cocona (Solanum sessiliflorum Dunal), and on the properties of the resulting powders. We used pre-established proportions between the solids of cocona pulp and the carrier agents (P:CA), and among carrier agents themselves, maltodextrin and hydrolyzed collagen, (MD:HC). The process was carried out in a spray dryer at an inlet air temperature of 120 ºC. We prepared twelve feed solutions containing 20% of total solids, with P:CA ratios of 1:3, 1:4, 1:5 and 1:6, and MD:HC ratios of 0:100, 50:50, and 100:0. Solids recovery was obtained for the evaluation of the spray drying process. The cocona pulp powders were analyzed for moisture content, water activity, particle size distribution, mean particle diameter, chemical structure (FTIR) and color. For a P:CA of 1:6, for the sample formulated with hydrolyzed collagen only, solids recovery (96.2%) was much higher than that of the sample with maltodextrin only (39.2%). The chemical structure of cocona powders can be considered a sign of a good encapsulation process. The color of the cocona pulp powder was similar to that of the carrier agents. The formulation with highest content of hydrolyzed collagen improved the recovery of solids, guaranteed the cocona pulp encapsulation, and obtained fruit powders with bioactive properties.

Contamination Control in Supercritical CO2 Drying Process for Nano-Scale Memory Manufacturing

2013 ◽  
Vol 58 (6) ◽  
pp. 197-204
Author(s):  
H. Hayashi ◽  
H. Okuchi ◽  
H. Tomita ◽  
Y. Ono ◽  
T. Nakamori ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Drying Process ◽  
Contamination Control ◽  
Nano Scale ◽  
Supercritical Co2 Drying

scholarly journals Microbial inactivation efficiency of supercritical CO2 drying process

2018 ◽  
Vol 36 (16) ◽  
pp. 2016-2021 ◽  
Author(s):  
Alessandro Zambon ◽  
Filippo Michelino ◽  
Siméon Bourdoux ◽  
Frank Devlieghere ◽  
Stefania Sut ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Microbial Inactivation ◽  
Drying Process ◽  
Supercritical Co2 Drying ◽  
Inactivation Efficiency

scholarly journals Editorial on Special Issues “Aerogels” and “Aerogels 2018”

Gels ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 19
Author(s):  
Françoise Quignard ◽  
Nathalie Tanchoux
Keyword(s):  
Porous Structure ◽  
Supercritical Co2 ◽  
Freeze Drying ◽  
Drying Process ◽  
Gel Structure ◽  
Supercritical Co2 Drying

Aerogels can be defined as ultralight materials with a 3D porous structure, similar to their parent wet gels, where the solvent has been replaced by a gas without a collapse of the gel structure, thanks to the drying process used (supercritical CO2 drying, freeze drying, etc [...]

Sign in / Sign up

Export Citation Format

Share Document