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Infrared spectra of the phenol–Ar and phenol–N2 cations: proton-bound versus π-bound structures
Chemical Physics Letters, 2000Abstract Infrared spectra of the phenol–Ar/N 2 cations (Ph + –Ar/N 2 ), produced in an electron impact ion source, are analyzed in the vicinity of the O–H stretch fundamental, ν 1 . For Ph + –Ar two isomers are identified by their ν 1 frequency shifts upon complexation: the proton-bound global minimum (Δ ν 1 =−65 cm −1 ) and the π -bound ...
Nicola Solcà, Otto Dopfer
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Effect of Storage on Wall-Bound Phenolics in Green Asparagus
Journal of Agricultural and Food Chemistry, 2002The cell walls of green asparagus spears have been analyzed for their phenolic and carbohydrate composition as modified by postharvest storage. Esterified phenolic components were released by sequential alkaline hydrolysis and identified and quantified by diode array HPLC.
Rocio C, Rodriguez-Arcos +2 more
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Importance of Insoluble-Bound Phenolics to Antioxidant Properties of Wheat
Journal of Agricultural and Food Chemistry, 2006Two commercial samples of soft (70% Canadian Eastern soft red spring and 30% Canadian Eastern soft white winter) and hard (90% Canadian western hard red spring and 10% Canadian Eastern hard red winter) wheats were used to obtain different milling fractions. Phenolics extracted belonged to free, soluble esters and insoluble-bound fractions.
Chandrika M, Liyana-Pathirana +1 more
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The revisited levels of free and bound phenolics in rice: Effects of the extraction procedure
Food Chemistry, 2016The effects of the type of solvolytic solution and number of extraction steps on the recovery of free phenolics, anthocyanins and proanthocyanidins from different rice samples were evaluated. Moreover, bound phenolic acids were determined as a function of enzymatic and/or alkaline hydrolysis treatment of the rice residue obtained after the extraction ...
Cristiano Dietrich Ferreira +2 more
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Synthesis and performance of phenolic polybutadiene‐bound stabilizers
Journal of Applied Polymer Science, 2002AbstractAn antioxidant derivative, 6‐sulfanylhexyl 3‐(3,5‐di‐tert‐butyl‐4‐hydroxyphenyl)propanoate, was synthesized and examined. With a radical initiator, the addition of this compound to pending vinyls of OH‐telechelic, low molecular weight liquid polybutadiene (LBH) was performed to various degrees of conversion to form polymeric antioxidants (PAOs)
Jiří Podešva, Jana Kovářová
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Infrared spectra of the H-bound and π-bound isomers of the phenol–argon cation
Journal of Molecular Structure, 2001Abstract Infrared photodissociation spectra of the phenol–argon cation (Ph + –Ar) are recorded in the vicinity of the O–H stretch vibration ( ν 1 ) of bare Ph + . Two isomers are identified by their characteristic complexation-induced frequency shifts, Δ ν 1 . In H-bound Ph + –Ar, the Ar atom forms an ionic hydrogen bond with the O–H group of Ph +
N Solcà, O Dopfer
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Content of Insoluble Bound Phenolics in Millets and Their Contribution to Antioxidant Capacity
Journal of Agricultural and Food Chemistry, 2010Soluble and insoluble-bound phenolic extracts of several varieties of millet (kodo, finger, foxtail, proso, pearl, and little millets) whole grains were evaluated for their phenolic contents and antioxidative efficacy using trolox equivalent antioxidant capacity (TEAC), reducing power (RP), and beta-carotene-linoleate model system as well as ferrous ...
Anoma, Chandrasekara, Fereidoon, Shahidi
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Ring Opening of a Resin-Bound Chiral Aziridine with Phenol Nucleophiles
The Journal of Organic Chemistry, 2010An efficient and versatile solid-phase route for the preparation of aryl-alkyl ethers is described. Regioselective ring opening of a resin-bound chiral aziridine with phenolic nucleophiles constitutes the key feature of the present protocol that allows incorporation of fluorescent moieties and subsequent on-resin protecting group interconversion ...
Ottesen, Lars Korsgaard +2 more
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Flavanol and Bound Phenolic Acid Contents in Different Barley Varieties
Journal of Agricultural and Food Chemistry, 2006Different barley varieties, consisting of hulled and hull-less types, of normal, waxy, and high amylose starch, as well as two-rowed and six-rowed types, were analyzed for their main proanthocyanidins and bound phenolic acids. Variations in proanthocyanidin and phenolic acid contents were studied in different barley types as well as inter-relationships
Ann Katrin, Holtekjølen +2 more
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Distribution of insoluble bound phenolic acids in barley grain
Journal of the Science of Food and Agriculture, 1984AbstractInsoluble bound phenolic acids were analysed by g.l.c. and by h.p.l.c. in eight abraded fractions of barley grain. Vanillic, p‐coumaric, ferulic and diferulic acids were identified in all the fractions. Ferulic and p‐coumaric acids were quantitatively the most important.
Erik Nordkvist +2 more
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