Matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry of canola, castor and olive oils

Ayorinde, Folahan O.; Elhilo, Eisa; Hlongwane, Caswell

doi:10.1002/(sici)1097-0231(19990430)13:8<737::aid-rcm552>3.3.co;2-c

Cited by 5 publications

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“…Spectra for castor oil show an m/z peak at 955.77 as the dominating signal. This corresponds to the molecular weight of triricinolein . A similar peak is seen in MCO spectra at a molecular weight of 956.98.…”

Section: Resultssupporting

confidence: 63%

A pre‐polyaddition mediation of castor oil for polyurethane formation

Chandan

Edatholath

Unni³

et al. 2016

J of Applied Polymer Sci

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We report a simple, serendipitous, two step mediation that overcomes the polyaddition threshold of castor oil during polyurethane formation. The mediation facilitates formation of polyurethane systems directly from castor oil without triricinolein chain extension or the use of supplementary hydroxyl compounds. The mediation involves refluxing castor oil with n-Butyl lithium in the presence of a solvent followed by water addition. We demonstrate the effectiveness of this mediation by successfully generating two important polyurethane systems (foam and coating) from castor oil. We identify that the mediation introduces two new compounds in castor oil namely, a lithiated diglyceride and a lithium salt of fatty acid. We characterize the new polyurethane synthesized for their hard-soft segmented morphology, glass transition temperature, and thermomechanical properties. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43964.

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Section: Resultssupporting

confidence: 63%

A pre‐polyaddition mediation of castor oil for polyurethane formation

Chandan

Edatholath

Unni³

et al. 2016

J of Applied Polymer Sci

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“…The MALDI‐TOF spectra in Figure (a) confirm the grafting of thiols with the occurrence of peaks at 957.10, 1192.61, and 1280.40 for CO, COM, and COT, respectively. The MALDI‐TOF spectrum of CO indicated that the CO used comprised three ricinoleins . The molecular weight differences of COM and COT to CO were 235.51 and 323.3, which are equivalent to the molar mass of three mercaptoethanol (78.13 g mol −1 ) and three thioglycerol (108.16 g mol −1 ), respectively.…”

Section: Resultsmentioning

confidence: 99%

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Park

Lee

Kim

et al. 2019

J of Applied Polymer Sci

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In this research, castor oil‐based polyols with gradual increasing functionalities were prepared using thiol‐ene photo click reaction. The polyols were prepared by facile and efficient photo‐click reaction using thiols with different number of hydroxyl groups. The polyols were successfully synthesized using a modified bio‐oxygen demand (BOD) reactor and their structures were characterized. The hydroxyl number of the prepared polyols gradually increased depending on the thiol used for preparation. The increased hydroxyl number resulted in increased crosslinking densities for the prepared polyurethanes. The effect of the increasing crosslinking density and structure of the polyols on the mechanical and thermal properties of polyurethane were investigated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48304.

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“…TAG analysis has been demonstrated with MALDI using either α-cyano-4hydroxycinnamic acid or 2,5-dihydrobenzoic acid (DHB). 8,9 Further research has shown that the addition of sodium salts such as sodium chloride (NaCl) increases sensitivity for the analysis of TAGs when using DHB as a matrix. 10,11 It was also observed that TAGs are prone to in-source fragmentation and that the addition of a strong alkaline such as sodium hydroxide (NaOH) reduces this phenomenon and thus increases signal.…”

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confidence: 99%

Sodium-Doped Gold-Assisted Laser Desorption Ionization for Enhanced Imaging Mass Spectrometry of Triacylglycerols from Thin Tissue Sections

2016

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The deposition of sodium salts followed by a sputtered layer of gold has been demonstrated to be a power combination for the analysis of triacylglycerols (TAGs) from tissue sections by laser desorption ionization (LDI) imaging mass spectrometry (IMS). Various sodium salts were tested for their capability to ionize TAGs and their ability to produce fast drying, small crystals (≤3 μm). The spray deposition of a sodium acetate and carbonate buffer mixture at pH 10.3 on which a 28 ± 3 nm sputtered layer of gold (Au-CBS) is subsequently deposited was found to provide the most effective combination for TAG analysis by high imaging resolution IMS. Under these conditions, a 30-fold increase in TAG signal intensity was observed when compared to matrix-assisted LDI (MALDI) methods using 2,5-dihydrobenzoic acid as matrix. Furthermore, Au-CBS led to an increase in the number of detected TAG species from ∼7 with DHB to more than 25 with the novel method, while few phospholipid signals were observed. These results were derived from the IMS investigation of fresh frozen mouse liver and rabbit adrenal gland tissue sections with a range of higher spatial resolutions between 35 and 10 μm. Au-CBS-LDI MS presents a highly sensitive and specific alternative to MALDI MS for imaging of TAGs from tissue sections. This novel approach has the potential to provide new biological insights on the role of TAGs in both health and disease.

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Matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry of canola, castor and olive oils

Abstract: A fast-drying sample preparation method, using a-cyano-4-hydroxycinnamic acid as a matrix in an acetonitrile/tetrahydrofuran solvent system, has been used to obtain the matrix-assisted laser desorption/ ionization (

Cited by 5 publications

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A pre‐polyaddition mediation of castor oil for polyurethane formation

A pre‐polyaddition mediation of castor oil for polyurethane formation

Castor oil‐based polyols with gradually increasing functionalities for biopolyurethane synthesis

Sodium-Doped Gold-Assisted Laser Desorption Ionization for Enhanced Imaging Mass Spectrometry of Triacylglycerols from Thin Tissue Sections

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