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Yellow color extraction from goldenrod shoots (Solidago species) involves isolating natural pigments such as flavonoids, xanthophylls, and carotenoids that give the shoots their bright yellow color. The process begins with harvesting young shoots, followed by cleaning and drying to preserve pigment quality. The dried shoots are ground into fine powder to increase the surface area for effective extraction. Extraction is typically performed using food-grade solvents like ethanol, methanol, or water, often enhanced by techniques such as ultrasound-assisted or microwave-assisted extraction to boost yield and maintain pigment stability. After extraction, the solution is filtered and concentrated to produce a vibrant yellow extract widely used in natural dyes, cosmetics, and food colorants. Maintaining optimal temperature, solvent concentration, and pH during extraction is crucial to preserve color intensity and bioactive properties.
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