Regulation of Areca Nut Coating Properties by Mass Concentration and Bloom Strength of Gelatin
The coating of areca nut with gelatin helps to enhance its gloss and water retention.However,the influence of gelatin concentration and bloom strength on coating performance is not yet clear.This study analyzed the differences in optical,mechanical,and water-barrier properties of gelatin-based films,and explored the causes of the variations in coating performance by infrared spectroscopy and X-ray diffraction.The results showed that the gelatin solution with the mass concentration of 100～150 g/L not only increased the gloss of areca nut by 8～15 times,but also endowed the film with good mechanical properties and water resistance.Although an increase in gelatin bloom strength enhanced the gloss of areca nut film,it had no significant effect on the mechanical properties and water resistance of the film.Differences in the content of intermolecular hydrogen bonding and triple helix structure in the film were crucial internal factors accounting for the different properties of gelatin coatings after film formation.Furthermore,the viscosity and coagulation temperature of the coating solution with a mass concentration of 100～150 g/L were more suitable for enhancing the uniformity of the coating film.This study can provide a scientific basis for the regulation of areca nut coating film performance and the rational selection of coating agents.
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