Selectivity of supercritical CO2 extraction and atmospheric pressure techniques for the major volatile compounds of Eugenia involucrata leaves from Southern Brazil

2017 ◽  
Vol 106 ◽  
pp. 29-34 ◽  
Author(s):  
J.J.S. Ciarlini ◽  
A. Marangoni ◽  
A. Bolzan
2018 ◽  
Vol 11 (4) ◽  
pp. 1527-1537 ◽  
Author(s):  
J. Saúl García-Pérez ◽  
Sara Paulina Cuéllar-Bermúdez ◽  
Alejandra Arévalo-Gallegos ◽  
Carmen Salinas-Salazar ◽  
José Rodríguez-Rodríguez ◽  
...  

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Ricardo Gobato ◽  
Alireza Heidari

An “explosive extratropical cyclone” is an atmospheric phenomenon that occurs when there is a very rapid drop in central atmospheric pressure. This phenomenon, with its characteristic of rapidly lowering the pressure in its interior, generates very intense winds and for this reason it is called explosive cyclone, bomb cyclone. With gusts recorded of 116 km/h, atmospheric phenomenon – “cyclone bomb” (CB) hit southern Brazil on June 30, the beginning of winter 2020, causing destruction in its influence over. One of the cities most affected was Chapecó, west of the state of Santa Catarina. The satellite images show that the CB generated a low pressure (976 mbar) inside it, generating two atmospheric currents that moved at high speed. In a northwest-southeast direction, Bolivia and Paraguay, crossing the states of Parana and Santa Catarina, and this draft that hit the south of Brazil, which caused the destruction of the affected states.  Another moving to Argentina, southwest-northeast direction, due to high area of high pressure (1022 mbar). Both enhanced the phenomenon.


2010 ◽  
Vol 39 (6) ◽  
pp. 880-886 ◽  
Author(s):  
Hae-Chang Yi ◽  
Sae-Hee Moon ◽  
Jun-Sung Park ◽  
Jee-Won Jung ◽  
Keum-Taek Hwang

Antioxidants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 918
Author(s):  
Nóra Emilia Nagybákay ◽  
Michail Syrpas ◽  
Vaiva Vilimaitė ◽  
Laura Tamkutė ◽  
Audrius Pukalskas ◽  
...  

The article presents the optimization of supercritical CO2 extraction (SFE-CO2) parameters using response surface methodology (RSM) with central composite design (CCD) in order to produce single variety hop (cv. Ella) extracts with high yield and strong in vitro antioxidant properties. Optimized SFE-CO2 (37 MPa, 43 °C, 80 min) yielded 26.3 g/100 g pellets of lipophilic fraction. This extract was rich in biologically active α- and β-bitter acids (522.8 and 345.0 mg/g extract, respectively), and exerted 1481 mg TE/g extract in vitro oxygen radical absorbance capacity (ORAC). Up to ~3-fold higher extraction yield, antioxidant recovery (389.8 mg TE/g pellets) and exhaustive bitter acid extraction (228.4 mg/g pellets) were achieved under the significantly shorter time compared to the commercially used one-stage SFE-CO2 at 10–15 MPa and 40 °C. Total carotenoid and chlorophyll content was negligible, amounting to <0.04% of the total extract mass. Fruity, herbal, spicy and woody odor of extracts could be attributed to the major identified volatiles, namely β-pinene, β-myrcene, β-humulene, α-humulene, α-selinene and methyl-4-decenoate. Rich in valuable bioactive constituents and flavor compounds, cv. Ella hop SFE-CO2 extracts could find multipurpose applications in food, pharmaceutical, nutraceutical and cosmetics industries.


2021 ◽  
Vol 46 ◽  
pp. 101458
Author(s):  
Adil Mouahid ◽  
Isabelle Bombarda ◽  
Magalie Claeys-Bruno ◽  
Sandrine Amat ◽  
Emmanuelle Myotte ◽  
...  

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 684
Author(s):  
Andrea Ruiu ◽  
Bernhard Bauer-Siebenlist ◽  
Marin Senila ◽  
W. S. Jennifer Li ◽  
Karine Seaudeau-Pirouley ◽  
...  

Precious metals, in particular Pd, have a wide range of applications in industry. Due to their scarcity, precious metals have to be recycled, preferably with green and energy-saving recycling processes. In this article, palladium extraction from an aluminosilicate-supported catalyst, containing about 2 wt% (weight%) of Pd (100% PdO), with supercritical CO2 (scCO2) assisted by complexing polymers is described. Two polymers, p(FDA)SH homopolymer and p(FDA-co-DPPS) copolymer (FDA: 1,1,2,2-tetrahydroperfluorodecyl acrylate; DPPS: 4-(diphenylphosphino)styrene), were tested with regards to their ability to extract palladium. Both polymers showed relatively low extraction conversions of approximately 18% and 30%, respectively. However, the addition of piperidine as activator for p(FDA-co-DPPS) allowed for an increase in the extraction conversion of up to 60%.


2019 ◽  
Vol 147 ◽  
pp. 162-171 ◽  
Author(s):  
Caroline Sielfeld ◽  
José M. del Valle ◽  
Federico Sastre

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