2013
DOI: 10.1016/j.ultsonch.2013.01.018
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Abstract: The influence of low-frequency ultrasound (40 kHz) in the esterification reaction between acetic acid and butanol for flavor ester synthesis catalyzed by the commercial immobilized lipase B from Candida antarctica (Novozym 435) was evaluated. A central composite design and the response surface methodology were used to analyze the effects of the reaction parameters (temperature, substrate molar ratio, enzyme content and added water) and their response (yields of conversion in 2.5 h of reaction). The reaction wa… Show more

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Cited by 106 publications
(75 citation statements)
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“…A conversion of more than 94% has been reported in a short time of 2.5 h under optimum conditions (temperature: 46 °C, butanol:acetic acid ratio: 3.6:1, enzyme content: 7%, and water content: 0.25%). This study showed that the application of ultrasonication to the synthesis of butyl acetate increased the productivity by 7.5-fold as compared with the conventional stirring method [125].…”
Section: Overview Of Synthesis Of Cosmetic Esters Using Ultrasound Irmentioning
confidence: 87%
See 1 more Smart Citation
“…A conversion of more than 94% has been reported in a short time of 2.5 h under optimum conditions (temperature: 46 °C, butanol:acetic acid ratio: 3.6:1, enzyme content: 7%, and water content: 0.25%). This study showed that the application of ultrasonication to the synthesis of butyl acetate increased the productivity by 7.5-fold as compared with the conventional stirring method [125].…”
Section: Overview Of Synthesis Of Cosmetic Esters Using Ultrasound Irmentioning
confidence: 87%
“…This can be especially useful in the synthesis of surfactant and antioxidant esters in which synthesis takes very long hours and sometimes days to reach equilibrium under conventional stirring technique. Ultrasonication also improves the yield of Page 18 of 74 A c c e p t e d M a n u s c r i p t 16 synthesis by several folds and can also increase the stability of enzymes over a number of cycles in some cases [125][126][127][128][129].…”
Section: Overview Of Synthesis Of Cosmetic Esters Using Ultrasound Irmentioning
confidence: 99%
“…Second, in non-aqueous systems, the level of water content can be critical to maintain the conformation of the catalytic site in the enzyme. Water's influence as an important factor contributing to the enzyme activity was considered [33][34][35]. The role of water in the solvent-free enzymatic esterification reaction was primarily studied by the adding water initially to the immobilized lipase, as well as by using a water adsorbent in reaction liquid [23].…”
Section: 22mentioning
confidence: 99%
“…In this study, we found that the lipase activity was restored when the membrane was dried to a water content of 4.39% (w/w). The water content of the biocatalyst is considered to be the main factor affecting reaction equilibrium, enzymatic activity, and the long-term stability of enzymes [33,34]; however, simple air-drying techniques and other measurements can help to restore the activity of immobilized enzymes.…”
Section: 22mentioning
confidence: 99%
“…[1][2][3][4] Among such esters, isopropyl octanoate, derived from the process of isopropanol esterification with octanoic acid in the presence of an acid catalyst (typically sulfuric or hydrochloric acid) in homogeneous medium, requires a complex process to remove the products and neutralize the acid catalyst. 5 Other solid acid catalysts have also been reported, but due to high acidity, parallel reactions are frequently observed.…”
Section: Introductionmentioning
confidence: 99%