Preparation and Physicochemical Analysis of Citri medica ‘Fingered’ Ultra-fine Powder
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Abstract:
Citrus medica ‘Fingered’ powder (FC) was prepared using conventional grinding and ultrafine grinding methods. The physicochemical properties of FC were investigated, with a focus on different particle sizes and the effect of particle size on the extraction rate of polysaccharides. The results indicated that ultrafine grinding could significantly reduce the particle size of FC. Extending the ultrafine grinding time reduced the particle size, producing finer and more uniform particles; however, it did not affect the chemical composition of the powder. Ultrafine grinding significantly improved the water solubility of the powder and reduced its water-holding capacity. The particle size produced by grinding had a significant impact on the above properties. A reduction in particle size significantly increased water solubility and decreased water-holding capacity. The water solubility of the powder with a particle size (D50) of 20.01 μm was as high as 64.49%, and the water-holding capacity was only 8.64%. In terms of color, as the particle size decreased, the brightness value gradually increased, the redness value gradually decreased, and the yellowness first increased and then decreased. Ultrafine grinding improved the extraction rate of polysaccharides from FC samples within a certain range, with the highest extraction efficiency occurring with a particle size of (D50) of 21.55 μm, reaching 7.68%. This study provided a theoretical basis for the application and product development of Citrus medica ‘Fingered’.
