脱咖啡碱速溶茶的研究

Study on Decaffeine Instant Tea

在活性炭表面制备一层厚度适当的疏水性脱咖啡碱专用膜,吸附脱除茶液中的生物碱,经浓缩、喷雾干燥后,即可生产出脱咖啡碱速溶茶。该速溶茶中的咖啡碱含量比未脱咖啡碱的速溶茶低80%以上,且茶多酚、氨基酸、水浸出物等风味物质的保留量高。研究结果表明,以活性炭为吸附剂,以植物油为膜剂,加0.1%月桂酸制成膜,膜厚度以膜剂浓度10%—25%内,其脱咖啡碱效果较佳。

A special hydrophobic decaffeine film was prepared on the surface ofactivated carbon to adsorb the alkaloids in the tea liquid.Decaffeine instanttea was obtained by concentrating and spray drying the decaffeine tea liquid.The caffeine content of the decaffeine instant tea is 80% lower than that ofthe nondecaffeine instant tea,and the polyphenols,amino acids,water,soluble materials are highly preserved.A better effect of decaffeine isobtained by using activated carbon as adsorbent,using vegetable oil as filmsolvent(10%—25%)and by adding 0.1% lauric acid to the film.