DEGRADATION KINETICS OF ANTHOCYANINS IN ACIDIC AQUEOUS EXTRACTS OF BERRIES
Journal Title: Вісник Одеського національного університету. Хімія - Year 2017, Vol 22, Issue 1
Abstract
The effect of pH, light and temperature on degradation of anthocyanins in acidic aqueous extracts of chokeberries, elderberries and blackberries was studied. The degradation of anthocyanins in berry extracts under influence of pH, light and temperature followed the first-order reaction kinetics. Anthocyanins of chokeberry extracts had the highest values of rate constants of degradation. Anthocyanins of blackberry extracts had the highest values of half-life time. The temperature dependences of the rate of anthocyanin degradation were described by the Arrhenius equation. Activation energies of anthocyanin degradation were 5.7, 10.1 and 15.0 kJ/mol at pH=2, respectively, for chokeberry, elderberry, and blackberry аnthocyanins.
Authors and Affiliations
L. M. Soldatkina, V. O. Novotna
Keywords
Related Articles
- EP ID EP334450
- DOI 10.18524/2304-0947.2017.1(61).94711
- Views 99
- Downloads 0
PHASE EQUILIBRIA IN THE ZrO2–Yb2O3 SYSTEM AT 1100 °С
Phase equilibria in the binary ZrO2 – Yb2O3 system at 1100°C were studied by X-ray diffraction and petrography in the overall concentration range. The samples of different compositions have been prepared from nitrate aci...
THE INFLUENCE OF HEAT TREATMENT IN THE DIFFERENT GASEOUS MEDIA ON THE OPTICAL PROPERTIES OF FROZEN MELTS EuS AND EuIn2S4IN NaCl-KCl
Influence of medium (inert gas, air) is studied at heat treatment of molten solutions of EuS and EuIn2S4 in NaCl-KCl of equimolar composition on optical properties. Unlike initial Europium (II) sulphides, stiffened melts...
THE SYNTHESIS OF BIOCONJUGATE BASED ON RHENIUM(I) CARBONYL COMPLEX FOR VISUALIZATION OF PATHOLOGICAL PROCESS
Tricarbonyl rhenium(I) complexes have a great potential like biomarkers. It is caused their biological stability, low toxicity, large Stokes shifts, and long luminescence lifetimes. Rhenium tricarbonyl complexes fac-[Re(...
IDENTIFICATION AND DETERMINATION OF GERMANIUM CHEMICAL FORMS IN THE OBJECTS OF DIFFERENT NATURE
On the basis of literary sources data the questions of identification and determination of Germanium chemical forms in various objects are considered. It is marked that this area of analytical chemistry of Germanium (in...
THIN EMULSIFIED SOLUTIONS OF TRIALKYLAMINE IN KEROSENE AS COLLECTORS FOR FLOTATION–EXTRACTION OF THORIUM (VI) COMPOUNDS
The principle possibility of using the thin emulsified solutions of trialkylamine in kerosene as collector of thorium compounds for their flotation extraction has been established. The colloid- chemical properties of the...