非晶颗粒态淀粉的理化性质及其吸附和包合茶多酚性能研究

发布时间：2018-05-12 00:05

  本文选题：非晶颗粒态淀粉 + 茶多酚　； 参考：《天津科技大学》2014年硕士论文

【摘要】：论文采用乙醇溶液处理法制备非晶颗粒态淀粉,研究了非晶化处理对玉米淀粉理化性质的影响；同时考察非晶颗粒态淀粉对茶多酚的吸附性能,并对其慢消化淀粉含量进行了测定。然后再以非晶颗粒态淀粉为介质,制备含有茶多酚的非晶颗粒态淀粉复合物,对复合物的理化性质进行表征,并分别对这两种样品的体外消化性能进行了测定。利用茶多酚具有明显抑制淀粉酶的活性和非晶颗粒态淀粉中慢消化淀粉和抗消化淀粉含量高的特点,从而提出一种新的抗性淀粉的制备方法。研究结果表明,非晶颗粒态玉米淀粉的颗粒仍保持完整,但颗粒表面有较大爆裂孔生成,并出现明显褶皱。与原玉米淀粉相比,其溶解度和膨胀力在相同的测定温度下均明显增加；非晶颗粒态玉米淀粉呈现V-型衍射结构,其结晶性基本消失, NCSG-92的结晶度仅为2.1%；随着非晶化温度逐渐增加,最大失重温度都在303.2～306.2℃之间,呈现细微增大的趋势；原玉米淀粉经乙醇溶液处理后,其快消化淀粉含量明显下降,而慢消化淀粉和抗性淀粉总含量明显上升, NCGS-88的RDS含量最少为81.64%,SDS和RS总含量为18.36%。非晶颗粒态玉米淀粉的体外消化性能实验表明,其酶解率较原淀粉有所提高,NCGS-85样品的酶解率最大到达99.2%。通过单因素实验确定非晶颗粒态玉米淀粉的最佳吸附条件为：茶多酚溶液浓度4 mg/mL,吸附温度25℃,吸附时间4h。在此条件下, NCGS-85对茶多酚的吸附量达到最大,为105.27 mg/g。茶多酚-非晶颗粒态玉米淀粉复合物的红外光谱结果表明,随着茶多酚的添加和非晶化温度的增加,茶多酚的红外特征峰逐渐明显。热分析实验表明,复合物的失重率分别为86.36%、85.79%和86.24%。体外消化实验表明,添加了茶多酚的非晶颗粒态玉米淀粉复合物的消化率分别为70.3%、73.0%和74.5%,较非晶颗粒态玉米淀粉有明显的降低。
[Abstract]:In this paper, amorphous granular starch was prepared by ethanol solution treatment, and the effects of amorphous treatment on physicochemical properties of corn starch were studied, and the adsorption of tea polyphenols by amorphous granular starch was also investigated. The content of slowly digested starch was determined. Then the amorphous granular starch complex containing tea polyphenols was prepared in the medium of amorphous granular starch. The physicochemical properties of the composite were characterized and the in vitro digestibility of the two samples were determined. A new preparation method of resistant starch was proposed by using tea polyphenols with obvious inhibition of amylase activity and high content of slow-digestible and anti-digestible starch in amorphous granular starch. The results showed that the grain of amorphous corn starch remained intact, but there were large burst pores and obvious folds on the surface of the grain. Compared with the original corn starch, the solubility and swelling power of the starch increased obviously at the same measuring temperature, and the amorphous granular corn starch showed a V-type diffraction structure. The crystallinity of NCSG-92 disappeared basically, the crystallinity of NCSG-92 was only 2.1. With the increase of amorphous temperature, the maximum weight loss temperature was between 303.2 鈩，

本文编号：1876219