Ultrasound-assisted process: Applications in reactions, extraction, and surface modifications

Sáenz‐Galindo, Aidé; Castañeda-Facio, Adali O.; Cedillo-Portillo, José J.; Vera-García, Paola F.; León-Martínez, P. A. De; Rodríguez‐Herrera, Raúl

doi:10.1016/b978-0-12-821938-6.00007-4

Cited by 3 publications

(3 citation statements)

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“…All compounds are reported to have a high percent of atom economy in the range of 67.28–90.38%, suggesting that most of the starting materials or reactants were effectively used with minimum waste produced (Table ). The concept of atom economy can be used to define new pollution prevention benchmarks and can be applied to any synthesis as it measures the greenness of the chemical reaction …”

Section: Resultsmentioning

confidence: 99%

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Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

et al. 2022

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A Schiff base bearing two methyl substituents, namely, 6,6′-((1E,1′E)-((2,2-dimethylpropane-1,3-diyl) bis(azanylylidene)) bis(methanylylidene)) bis(2-methylphenol) [H2AD1Me] was synthesized and characterized through physicochemical and spectroscopic analyses. Then, the Schiff base was complexed with Pd(II) and Ni(II) to form [Pd(AD1Me)] and [Ni(AD1Me)], respectively. Both metal complexes were successfully obtained and characterized through several analyses, viz., melting point, elemental analysis, molar conductivity, magnetic susceptibility, FTIR, 1H NMR, UV–vis, and single crystal X-ray diffraction. A quantitative analysis of the intermolecular interactions in the crystal structures has been performed using Hirshfeld surface analysis. Both metal complexes were crystallized in a monoclinic crystal system with the space group of P21/c. Additionally, the deprotonated phenolic oxygen atom (O1/O2) and azomethine nitrogen atom (N1/N2) of the ligand chelate the Pd(II) and Ni(II) ions, forming a slightly distorted square-planar complex containing three six-membered rings encircling the metal core with dsp2 hybridization. The shift of ν(CN) to a higher frequency in FTIR by 26–28 cm–1 indicated that the complexation to Pd(II) and Ni(II) through the azomethine N was established. It was further supported through the shifting of the azomethine proton signal to higher or lower chemical shifts with Δδ = 0.43–1.15 ppm in 1H NMR. In addition, the shifting of the n−π*(CN) band in UV–vis spectra with Δλ = 24–40 nm indicated the involvement of azomethine nitrogen in the complexation. All the compounds showed no significant antibacterial activity against three bacterial strains, namely, Staphylococcus aureus subsp. aureus Rosenbach (ATCC 6538), Streptococcus mutans Clarke (ATCC 700,610), and Proteus vulgaris (ATCC 6380), as the percent growth inhibition calculated was less than 90%.

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Section: Resultsmentioning

confidence: 99%

“…The concept of atom economy can be used to define new pollution prevention benchmarks and can be applied to any synthesis as it measures the greenness of the chemical reaction. 23 …”

Section: Resultsmentioning

confidence: 99%

Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

et al. 2022

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“…As an example of these methods, it can be cited the use of unconventional solvents ( Sanz, Flórez-Fernández, Domínguez, & Torres, 2020 ), negative pressure extraction ( Roohinejad et al, 2016 , Sanz et al, 2020 ), supercritical extraction with CO 2 ( Bermejo et al, 2016 , Sanz et al, 2020 ), pressurized liquid extraction ( Sanz et al, 2020 ), extraction with subcritical water ( Wu et al, 2018 ), ultrasound-assisted extraction ( Sáenz-Galindo et al, 2021 ), and extraction by filter membranes ( Sanz et al, 2020 ).…”

Section: Bioactive Composition Of Teasmentioning

confidence: 99%

Processing, chemical signature and food industry applications of Camellia sinensis teas: An overview

et al. 2021

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Processing Technologies for the Extraction of Value-Added Bioactive Compounds from Tea

et al. 2023

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Tea ( Camellia sinensis) is the most widely consumed beverage in the world, with an excellent source of bioactive compounds such as catechins, caffeine, and epigallocatechin. There is an increasing trend to extract these bioactive compounds to deliver them as value-added products. Generally, the extraction of polyphenols and other functional compounds from different parts of tea is carried out using different solvents (e.g., water, water–ethanol, ethanol, methanol, acetone, ethyl acetate, and acetonitrile). The extraction efficiency of functional compounds from tea depends on the type and polarity of the solvent as well as the applied process. Several conventional techniques, such as boiling, heating, Soxhlet, and cold extraction, are used to extract bioactive ingredients. However, these procedures are unsuitable for achieving high yields and biological activities due to the long extraction times of cold brewing and the high temperatures in other heating methods. Many efforts have been carried out in food and pharmaceutical industries to replace conventional extraction techniques with innovative technologies (e.g., microwave (MAE), ultrasonic (UAE), pressurized liquid (PLE), pulsed electric field (PEF), and supercritical fluid (SFE)), which are fast, safe, energy-saving, and can present eco-friendly characteristics. These innovative extraction techniques have proven to improve the recovery rate of phenolic-based antioxidant compounds from tea and increase their extraction efficiency. In this review, the application of novel processing technologies for the extraction of value-added compounds from tea leaves is reviewed. The advantages and drawbacks of using these technologies are also highlighted.

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Ultrasound-assisted process: Applications in reactions, extraction, and surface modifications

Cited by 3 publications

References 80 publications

Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

Processing, chemical signature and food industry applications of Camellia sinensis teas: An overview

Processing Technologies for the Extraction of Value-Added Bioactive Compounds from Tea

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