Method for preparing natural structural color pigment from lignocellulose biomass material

Abstract

The invention discloses a method for preparing a natural structural color pigment from a lignocellulose biomass material, and belongs to the technical field of pigment preparation. The method specifically comprises the following steps: (1) crushing a biomass material, and mixing the crushed biomass material with an organic solvent-water binary mixed solvent for reaction; (2) after the reaction is finished, collecting a reaction solution, and supplementing water into the reaction solution to aggregate the lignin so as to obtain a solution containing colloidal particles; and (3) precipitating and aggregating the colloidal particles in the solution obtained in the step (2), then separating the precipitate, and mixing the precipitate with a solvent to obtain the biomass-based pigment with the natural structural color. According to the method, various lignocellulose primary biomasses can be directly utilized as raw materials, the primary biomasses can be directly utilized as the raw materials to prepare products under the condition that three components of lignocellulose are not separated in advance, and the method is simple to operate and suitable for various lignocellulose biomass raw materials.

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