Interaction of β-cyclodextrin with unsaturated and saturated straight chain fatty acid anions studied by phenolphthalein displacement

dc.contributor.author	Skoulika, SG	en
dc.contributor.author	Georgiou, CA	en
dc.contributor.author	Polissiou, MG	en
dc.date.accessioned	2014-06-06T06:43:57Z
dc.date.available	2014-06-06T06:43:57Z
dc.date.issued	1999	en
dc.identifier.issn	09230750	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1583
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0033130099&partnerID=40&md5=ef43c5339eb265f626a01d4d7f6166e7	en
dc.subject	β-cyclodextrin	en
dc.subject	Capric acid	en
dc.subject	Caprylic acid	en
dc.subject	Complex formation constants	en
dc.subject	Free fatty acids	en
dc.subject	Linoleic acid	en
dc.subject	Linolenic acid	en
dc.subject	Oleic acid	en
dc.subject	Olive oil	en
dc.subject	Palmitoleic acid	en
dc.subject	Phenolphthalein	en
dc.subject	Spectrophotometric probe	en
dc.title	Interaction of β-cyclodextrin with unsaturated and saturated straight chain fatty acid anions studied by phenolphthalein displacement	en
heal.type	journalArticle	en
heal.publicationDate	1999	en
heal.abstract	The interaction of β-cyclodextrin (β-CD) with palmitoleate, linolenate, caprinate and caprylate was studied by the displacement of phenolphthalein (PHP) from the β-CD cavity. Absorbance values of β-CD-PHP solutions at 550 nm in 0.020 mol L-1 Na2CO3 buffer, pH 10.5, at 21.0 ± 0.5 °C, increased as the fatty acid anion was added. The concentration range of fatty acid anion used was 0.390-32.1 × 10-4 mol L-1 in the study of palmitoleate and linolenate, 1.92-80.0 × 10-4 mol L-1 in the study of caprinate and 0.770-32.0 × 10-3 mol L-1 in the study of caprylate. Concentrations of β-CD and PHP were 1.00 × 10-3 mol L-1 and 1.00-3.00 x 10-4 mol L-1 respectively. Data were fitted by nonlinear regression to a two step complexation model. Complex formation constants thus determined for the 1 : 1 and 1 : 2, fatty acid anion : β-CD complex were: (1.2 ± 0.2) × 104 and (2.9 ± 0.2) × 102 mol-1 L for palmitoleate, (9.3 ± 0.9) × 103 and (1.1 ± 0.1) × 102 mol-1 L for linolenate, (4.1 ± 0.2) × 103 and 81 ± 8 mol-1 L for caprinate, and (5.2 ± 0.7) × 102 and 27 ± 5 mol-1 L for caprylate respectively. The PHP-β-CD complex was also evaluated as a spectrophotometric sensor for the determination of olive oil acidity.	en
heal.journalName	Journal of Inclusion Phenomena	en
dc.identifier.issue	1	en
dc.identifier.volume	34	en
dc.identifier.spage	85	en
dc.identifier.epage	96	en