双醛马铃薯淀粉的理化性质及抗氧化性

Physicochemical Properties and Antioxidating Activities of Dialdehyde Potato Starch

以马铃薯淀粉为原料,采用高碘酸钠为氧化剂,通过控制高碘酸钠的浓度,分别制备了醛基含量为56.87%和90.66%的双醛马铃薯淀粉DAS-56.87和DAS-90.66.通过碱消耗法测定制备的化合物的醛基含量,考察了其溶解度、溶胀度及透光率.运用扫描电镜,对其外貌形态进行观察,通过红外吸收光谱证实了醛基的存在,进而考察了热失重,对其热稳定性进行研究.通过1,1–二苯基–2–三硝基苯肼(DPPH)实验,表明双醛马铃薯淀粉具有较好的抗氧化性,当样品的质量浓度为3.0,mg/mL时,DAS-56.87和DAS-90.66对DPPH自由基的清除率分别为42.64%和62.71%.

Using potato starch as a raw material and sodium periodate as an oxidant, dialdehyde potato starches （DAS） 56.87% and 90.66% were prepared by controlling the concentration of sodium periodate. The aldehyde content of the samples was determined by alkali consumption, and their solubility, swelling degree, and transmittance were also investigated. The shape was observed with electronic scanning microscopy （SEM）, the aldehyde groups were confirmed by FT-IR, and its thermal stability was examined through thermogravimetric （TG） analysis. The results of DPPH test indicated that dialdehyde potato starch has high antioxidating effect, and when the concentration was 3.0 mg/mL, the aldehyde content 56.87% or 90.66% in the sample, the clearance rates of DPPH radical were 42.64% and 62.71% respectively.