Characteristic of the Pigments Extracted by Alkali from Chestnut Shell

摘要

Sampled with the pigments extracted by alkali solution from chestnut shell,the characteristic was compared with caramel pigment.The spectrophotometer was used to measure the absorbance at different wavelengths.The chromaticness,red index and the stability of the pigments from the chestnut shell related.Compared with caramel pigments,lower chromacticness and higher red index of shell pigments were shown.Furthermore,the chromaticness and red index of samples were increased with the pH value.In addition,the stability of the pigments from chestnut shell was better when the pH value was between 3.5-6.0.But its stability in salt solution was not as good as caramel pigments.