Hofmeister effect on enzymatic catalysis and colloidal structures

Bauduin, Pierre; Renoncourt, Audrey; Touraud, Didier; Kunz, Werner; Ninham, Barry W.

doi:10.1016/j.cocis.2004.05.031

Cited by 90 publications

(61 citation statements)

References 18 publications

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“…Published results suggest that the use of several salts have been shown positive effects in the lipase activity and consequently, increase the formation of free fatty acids (Bauduin et al 2004;Mendes and Castro 2005). For PPL the addition of several salts at a fixed concentration of 20 mM in the substrate medium resulted in either activation or inhibition of the hydrolytic activity as displayed in Fig.…”

Section: Resultsmentioning

confidence: 84%

Enzymatic hydrolysis of soybean oil using lipase from different sources to yield concentrated of polyunsaturated fatty acids

Freitas

Bueno

Pérez

et al. 2007

World J Microbiol Biotechnol

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The ability of three commercially available lipases to mediate the hydrolysis of the soybean oil to yield concentrated of essential fatty acids was evaluated. The tested lipases were from microbial (Candida rugosa and Thermomyces lanuginosa) and animal cells (Porcine pancreatic lipase). In terms of free fatty acids, microbial lipases were more effective to promote the enzymatic hydrolysis of the soybean oil (over 70%) than the porcine pancreatic lipase (24%). In spite of this, porcine pancreatic lipase (PPL) showed the most satisfactory specificity towards both essential fatty acids and was, therefore, chosen to carry out additional studies. An experimental design was performed taking into consideration the enzyme and NaCl amounts as independent variables. The main effects were fitted by multiple regression analysis to a linear model and maximum fatty acids concentration could be obtained using 3.0 wt% of lipase and 0.08 wt% of NaCl. The mathematical model representing the hydrolysis degree was found to describe adequately the experimental results. Under these conditions, concentrations of 29.5 g/L and 4.6 g/L for linoleic and linolenic acids, respectively, were obtained.

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Section: Resultsmentioning

confidence: 84%

Enzymatic hydrolysis of soybean oil using lipase from different sources to yield concentrated of polyunsaturated fatty acids

Freitas

Bueno

Pérez

et al. 2007

World J Microbiol Biotechnol

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“…These results may open interesting perspectives in biology, notably via the role of the ionic double layer 41,42 . outgassed reference (ROG) and outgassed treated (TOG) water samples.…”

Section: Discussionmentioning

confidence: 84%

Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: Role of bubble/water interface

Vallée

Lafait

Mentré

et al. 2005

The Journal of Chemical Physics

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The effects of a pulsed low frequency electromagnetic field were investigated on photoluminescence of well characterized water and prepared under controlled conditions (container, atmospheric, electromagnetic, and acoustic environments). When reference water samples were excited at 260 nm, two wide emission bands centered at 345 nm (3.6 eV) and 425 nm (2.9 eV) were observed. By contrast under 310 nm excitation, only one band appeared at 425 nm. Interestingly, electromagnetic treatment (EMT) induced, at both excitation wavelengths, a decrease (around 70%) in the 425 nm band relative photoluminescence intensity. However, no difference between reference and treated sample was observed in the 345 nm band. Other experiments, performed on outgassed samples (reference and treated), show that the emission bands (position, shape, intensity) under excitation at 260 nm and 310 nm were similar and close to the corresponding bands of the treated nonoutgassed samples. Similar effects were observed on photoluminescence excitation of water samples. Two excitation bands monitored at 425 nm were observed at 272 nm and 330 nm. After EMT and/or outgassing, a decrease (> 60%) was observed in the intensity of these two bands. Altogether, these results indicate that electromagnetic treatment and/or outgassing decrease in a similar fashion the photoluminescence intensity in water samples. They also suggest that this effect is most likely indirectly attributed to the presence of gas bubbles in water. The possible role of hydrated ionic shell around the bubbles in the observed extraluminescence is discussed.

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“…The yields of FAME formation obtained in the IL within a 24-h period did not show an obvious relationship with the water activities provided by the salt hydrates, but instead, they increased gradually with an increase in the (B À -B + ) values of the salts added (data not shown). Here B À and B + are the Jones-Dole viscosity B coefficients for both the anion and cation of the salt, respectively (Jenkins and Marcus, 1995), which can be used to characterize the kosmotropic/chaotropic properties of the ions involved (for recent reviews, see (Bauduin et al, 2004;Zhao, 2005;Yang, 2009)). This correlation between the FAME yield and the (B À -B + ) value of the salt added corresponds well with our previous findings and supports our viewpoint regarding the dual function exhibited by salt hydrates in nonaqueous media (Yang et al, 2010): in addition to the water buffering effect, a salt hydrate may also affect the enzyme activity via its specific ion effect.…”

Section: Effect Of Salt Hydrates On Pel-catalyzed Biodiesel Productionmentioning

confidence: 99%

Penicillium expansum lipase-catalyzed production of biodiesel in ionic liquids

Zhang

Lai

Huang

et al. 2011

Bioresource Technology

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Hofmeister effect on enzymatic catalysis and colloidal structures

Cited by 90 publications

References 18 publications

Enzymatic hydrolysis of soybean oil using lipase from different sources to yield concentrated of polyunsaturated fatty acids

Enzymatic hydrolysis of soybean oil using lipase from different sources to yield concentrated of polyunsaturated fatty acids

Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: Role of bubble/water interface

Penicillium expansum lipase-catalyzed production of biodiesel in ionic liquids

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