高生物活性柠檬膳食纤维的功能特性研究

Study on the physiological characteristics of lemon dietary fiber rich in bioactive composition

以柠檬皮渣为原料采用冷冻干燥、热风干燥两种工艺制备膳食纤维,测定所得膳食纤维的维生素C(VC)含量、黄酮含量、葡萄糖透析延迟能力、阳离子交换能力,比较两种工艺对制品生理功能指标的影响。结果表明经冷冻干燥后所得膳食纤维的VC含量为144.078mg/100g,黄酮含量为1267.574mg/100g,经热风干燥后所得膳食纤维的VC含量为66.674mg/100g,黄酮含量为1000.037mg/100g;冷冻干燥80目产品、16目产品的葡萄糖透析延迟指数分别为62.21和57.07,热风干燥80目产品、16目产品的葡萄糖透析延迟指数分别为56.01和49.46;在NaOH滴入量为0～8mL时,两种工艺所得产品的阳离子交换能力基本一致,在NaOH滴入量为8～11mL时,阳离子交换能力由高到低分别为:冷冻干燥80目产品,热风干燥80目产品,冷冻干燥16目产品,热风干燥16目产品,并且这种差异性在各处理样品间表现为显著。总体来说是冷冻干燥工艺所得膳食纤维更具有优势。

Fresh lemon peels were used as raw material to produce dietary fiber by two processing methods,i.e.freeze drying and hot air drying.Vitamine C（VC） content,flavonoid content,glucose dialysis retardation index（GDRI） and cation exchange capacity of dietary fiber produced above were tested in order to compare the effects of the two techniques on the physiological characteristics.The contents of VC and flavonoid in freeze-dried dietary fiber were 144.078mg/100g and 1267.574mg/100g,respectively,which were higher than those in hot-air dried ones,the contents of VC and flavonoid in hot-air dried dietary fiber were 66.674mg/100g and 1000.037mg/100g,respectively.GDRI in freeze-dried products of 80 mesh,16 mesh were 62.21 and 57.07,respectively.GDRI in air-dried products of 80 mesh,16 mesh products were 56.01 and 49.46,respectively.With regard to cation exchange capacity（CEC）,there was no difference for the two kinds of producing method when the titrated amount of NaOH was between 0~8mL.However,the processing method and particle size of the products had significant effects on CEC（P0.05） when the titrated amount of NaOH was between 8~11mL,CEC order from high to low were as follows：80 mesh freeze-dried product,80 mesh hot-air dried product,16 mesh freeze-dried product and 16 mesh hot-air dried product.Generally,freeze-dried processing products had more advantages in their physiological characteristics.