ENTHALPY - ENTROPY AND FREQUENCY FACTOR - ACTIVATION-ENERGY COMPENSATION RELATIONS FOR DIFFUSION IN STARCH AND POTATO TISSUE

Date

1993-02-01

Author

OZILGEN, M

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

272
views

0
downloads

Diffusion of water in hydrated starch, hydrated starch plus sucrose, and diffusion of glucose, potassium, magnesium and ascorbic acid in potato tissue, i.e. a major natural source of starch, were analyzed with Eyring's diffusion theory and the compensation relations. The results implied that there may be an isokinetic temperature for the diffusion of water in amioca (amylopectin, one of the major macromolecular components of starch) and hylon 7 (native corn starch). Having an isokinetic temperature may imply that diffusional jump occurs via formation of similar activated complexes. Although the compensation relations were satisfied, there was no isokinetic temperature with diffusion of water in hylon 7 plus sucrose and diffusion of glucose, potassium, magnesium and ascorbic acid in potato tissue, therefore the compensation relations with these two systems were considered only as empirical correlations for estimating the diffusivities.

Subject Keywords

Food Science, Organic Chemistry

URI

https://hdl.handle.net/11511/64191

Journal

STARCH-STARKE

DOI

https://doi.org/10.1002/star.19930450204

Collections

Department of Food Engineering, Article

Suggestions

OpenMETU
Core

Mechanical and biochemical characterisation of wheat gluten films as a function of pH and co-solvent Kayserilioglu, BS; Stevels, WM; Mulder, WJ; Akkas, N (Wiley, 2001-08-01) Dispersions of wheat gluten were prepared at different pHs (4, 6 and 11) in the presence or absence of ethanol. Films were obtained after casting suspensions followed by evaporation of the solvent. Films prepared at pH 11 were significantly stronger than the films prepared at pH 4 and 6 with tensile strengths of approximately 7 vs. 2 MPa. With increasing strength, the elongation at break was moderately reduced from approximately 300% to 190%. No significant variations of water vapour transfer rate propertie...
ANNULATION REACTIONS OF 4-METHOXY-2-PYRONE WITH VARIOUS ACTIVE METHYL COMPOUNDS Tanyeli, Cihangir (Informa UK Limited, 1989-01-01) Some phenolic biphenyl compounds have been synthesised via the annulation reactions of 4-methoxy-2- pyrone with various active methyl compounds.
ENANTIOSELECTIVE OXIDATION OF THIOANISOLE TO METYL PHENYL SULFOXIDE BY CHIRAL COMPOUNDS BEARING N-Cl BOND İPEK, HALİL; Akdağ, Akın (Informa UK Limited, 2015-08-03) Chiral sulfoxides are used in asymmetric synthesis and are present in various biologically active compounds. Asymmetric synthesis of the sulfoxides has been performed by chiral metal complexes and non-metals containing peroxide and oxide moieties. In this study, a new metal free method has been developed to oxidize thioanisole into methyl phenyl sulfoxide with easily accessible chiral compounds carrying N-Cl bond. For this purpose, chiral amine and amide bearing reagents were synthesized and chlorinated by ...
KINETIC COMPENSATION DURING HOMOGENEOUS AND HETEROGENEOUS NUCLEATION OF ICE IN AQUEOUS SYSTEMS OZILGEN, S; OZILGEN, M; REID, DS (Elsevier BV, 1994-01-01) Homogeneous and heterogeneous nucleation rates of ice in aqueous systems are described in the literature with the equation J = A exp (B tau). There are a very large number of published data available for variation of the constants A and B with experimental conditions. Results of this study show that the parameters obtained in the experiments with differential scanning calorimeter and the microscopic technique may be described separately with an empirical compensation equation of the form In A = aB + b. The ...
Asymmetric synthesis of N-aryl substituted chiral 1,4-aminoalcohol derivatives and applications in various asymmetric transformation reactions Odabaş, Serhat; Tanyeli, Cihangir; Department of Chemistry (2007) The asymmetric synthesis of N-aryl substituted chiral 1,4-aminoalcohols and their applications in asymmetric borane reduction and enantioselective diethylzinc addition to benzaldehyde reactions were performed starting from meso-anhydride 51 that is the cycloadduct of cyclopentadiene and maleic anhydride. The desymmetrization of meso-anhydride 51 was achieved by using quinine or quinidine with very high enantiomeric excess value (up to 98% ee) and with high chemical yield. The quinine-mediated desymmetrizati...

Citation Formats

M. OZILGEN, “ENTHALPY - ENTROPY AND FREQUENCY FACTOR - ACTIVATION-ENERGY COMPENSATION RELATIONS FOR DIFFUSION IN STARCH AND POTATO TISSUE,” STARCH-STARKE, pp. 48–51, 1993, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64191.