Extraction of natural color component from the bark of Belleric myrobalan (Terminalia bellerica): Kinetic and adsorption studies

Abstract

KEYWORDSBaicalein, a trihydroxy flavone from the bark of Terminalia bellerica was identified as a natural colorant. The potential of the natural color component on silk yarn was tested. Its properties of color fastness with regard to light, washing and crocking were investigated and found to be satisfactory. Thermodynamic parameters were evaluated. The positive value of enthalpy of dyeing suggests the endothermic nature of dyeing and the negative entropy implies that the dye molecules are orderly arranged on silk. The positive value of free energy confirms the affinity between the dye molecules and the protein content of silk. Further, adsorption studies were carried out to determine the best fit isotherm model for the present dyeing system. The Langmuir isotherm model fitted the experimental data very well with a relatively high regression coefficient compared to the Freundlich and Tempkin-Pyzhev isotherm models. In conclusion, the Terminalia bellerica bark can be used as a potential source of natural dye for silk. BaicaleinTerminalia bellerica Identification Adsorption-kinetics Thermodynamics

Metal mordanting in dyeing with natural colourants

“…The changes in colour depth vs light fastness grades in dyeings mordanted with aluminium (), tin (), iron (), chromium (), and copper () salts . Quadrants are indicated by Roman numerals in part (a) of the figure.…”

“…The changes in colour (lightness, brightness, and hue) vs light fastness grades in dyeings mordanted with aluminium (), tin (), iron (), chromium (), and copper () salts …”

“…Mordants are agents applied onto substrates before, during, or after the coloration step (termed pre‐, meta‐, and post‐mordanting respectively). Plant polyphenols such as tannins and tannic acid function as mordants , but metal salts are by far most commonly used.…”