Vapor pressure data for fatty acids obtained using an adaptation of the DSC technique

Falleiro, Rafael M. Matricarde; Silva, Luciana Y. Akisawa; Meirelles, Antônio José de Almeida; Krähenbühl, Maria Alvina

doi:10.1016/j.tca.2012.07.034

Cited by 31 publications

(19 citation statements)

References 12 publications

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“…MeOH washing significantly reduced exogenous SA, however, furnace baking had no significance effect on SA removal ( P = 1.39 × 10 −1 for furnace baking and 4.53 × 10 −6 for MeOH washing, Kruskal Wallis test, Dunn’s post hoc test with Bonferroni correction). The poor removal efficiency of SA upon furnace baking is in agreement with the lower vapor pressure of SA compared to PA at equal temperature 28 . In contrast, a significant reduction of PA or SA was observed upon MeOH washing, resulting in an average of 73% and 64% removal for PA and SA, respectively.…”

Section: Resultssupporting

confidence: 59%

Development of an optimized sample preparation method for quantification of free fatty acids in food using liquid chromatography-mass spectrometry

Park

Song

Cha

et al. 2021

Sci Rep

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Accurate and precise determination of free fatty acid (FFA) contents is essential for quality control and assurance in food production. Herein, a mass spectrometric study was performed to develop a sample preparation protocol that can minimize exogenous FFA contamination during the quantification of FFA in food. The quantities of exogenous FFAs were measured using various combinations of seven pretreatment methods for a sample tube, three extraction methods, and four types of sample tubes. Methanol washing could effectively reduce exogenous palmitic acid (PA) and stearic acid (SA) by 73 and 64%, respectively, in contrast to furnace baking resulting in a decrease in the amount of PA and SA contaminants by 50 and 37%, respectively. A lower amount of FFA contaminants was extracted from glass tubes during comparative analysis of the four different sample tubes studied. A combination of a methanol-washed glass tube and chloroform extraction solvent was determined to be the optimal method for minimizing the error in FFA quantification. The optimized sample preparation protocol used for FFA quantification can lower the amount of foreign palmitic acid and stearic acid to the sub-nanomolar level in the analysis of FFAs in skimmed milk.

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Section: Resultssupporting

confidence: 59%

Development of an optimized sample preparation method for quantification of free fatty acids in food using liquid chromatography-mass spectrometry

Park

Song

Cha

et al. 2021

Sci Rep

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“…This can be explained by the yield of transferred fatty acid chlorides, which might be lower for C18, due to the grafting temperature. The grafting temperature was equal for both fatty acid chlorides, but the vapor pressure of C18 is higher than the vapor pressure of C16 fatty acid chlorides [53]. However, it should be mentioned that this property was not separately measured.…”

Section: Wvtr Before and After Graftingmentioning

confidence: 94%

Water Repellence and Oxygen and Water Vapor Barrier of PVOH-Coated Substrates before and after Surface Esterification

et al. 2014

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This study investigates chemical grafting with fatty acid chlorides as a method for the surface modification of hydrophilic web materials. The resulting changes in the water repellence and barrier properties were studied. For this purpose, different grades of polyvinyl alcohol (PVOH) were coated on regenerated cellulose films ("cellophane") and paper and then grafted with fatty acid chlorides. The PVOH grades varied in their degree of hydrolysis and average molecular weight. The surface was esterified with two fatty acid chlorides, palmitoyl (C16) and stearoyl chloride (C18), by chemical grafting. The chemical grafting resulted in water-repellent surfaces and reduced water vapor transmission rates by a factor OPEN ACCESSPolymers 2014, 6 2765 of almost 19. The impact of the surface modification was greater for a higher degree of hydrolysis of the polyvinyl alcohol and for shorter fatty acid chains. Although the water vapor barrier for palmitoyl-grafted PVOH was higher than for stearoyl-grafted PVOH, the contact angle with water was lower. Additionally, it was shown that a higher degree of hydrolysis led to higher water vapor barrier improvement factors after grafting. Furthermore, the oxygen permeability decreased after grafting significantly, due to the fact that the grafting protects the PVOH against humidity when the humidity is applied on the grafted side. It can be concluded that the carbon chain length of the fatty acid chlorides is the limiting factor for water vapor adsorption, but the grafting density is the bottleneck for water diffusing in the polymer.

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“…Differential scanning calorimetry (DSC) has been used to determine the vapour pressure of diverse compounds, for instance, alkyl phosphonates [ 19 ], ethyl esters [ 20 ], 2-dialkyl aminoethanethiols [ 21 ], fatty acids [ 22 ] and precursors of chemical warfare agents [ 23 ]. In DSC, the isothermal boiling temperature of a pure compound is measured as a function of pressure.…”

Section: Methodsmentioning

confidence: 99%

Raspberry Ketone Analogs: Vapour Pressure Measurements and Attractiveness to Queensland Fruit Fly, Bactrocera tryoni (Froggatt) (Diptera: Tephritidae)

et al. 2016

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The Queensland fruit fly, Bactrocera tryoni (Froggatt) (Q-fly), is a major horticultural pest in Eastern Australia. Effective monitoring, male annihilation technique (MAT) and mass trapping (MT) are all important for control and require strong lures to attract flies to traps or toxicants. Lure strength is thought to be related in part to volatility, but little vapour pressure data are available for most Q-fly lures. Raspberry ketone (4-(4-hydroxyphenyl)-2-butanone) and analogs that had esters (acetyl, difluoroacetyl, trifluoroacetyl, formyl, propionyl) and ethers (methyl ether, trimethylsilyl ether) in replacement of the phenolic group, and in one case also had modification of the 2-butanone side chain, were measured for their vapour pressures by differential scanning calorimetry (DSC), and their attractiveness to Q-fly was assessed in small cage environmentally controlled laboratory bioassays. Maximum response of one category of compounds, containing both 2-butanone side chain and ester group was found to be higher than that of the other group of compounds, of which either of 2-butanone or ester functionality was modified. However, linear relationship between vapour pressure and maximum response was not significant. The results of this study indicate that, while volatility may be a factor in lure effectiveness, molecular structure is the dominating factor for the series of molecules investigated.

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Vapor pressure data for fatty acids obtained using an adaptation of the DSC technique

Cited by 31 publications

References 12 publications

Development of an optimized sample preparation method for quantification of free fatty acids in food using liquid chromatography-mass spectrometry

Development of an optimized sample preparation method for quantification of free fatty acids in food using liquid chromatography-mass spectrometry

Water Repellence and Oxygen and Water Vapor Barrier of PVOH-Coated Substrates before and after Surface Esterification

Raspberry Ketone Analogs: Vapour Pressure Measurements and Attractiveness to Queensland Fruit Fly, Bactrocera tryoni (Froggatt) (Diptera: Tephritidae)

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