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不同直链淀粉含量玉米淀粉颗粒特性

不同直链淀粉含量玉米淀粉颗粒特性

来源网址:https://www.swjjkl.com/ 2021-06-28 15:37:49    

无定型区和结晶区通过环状交替形成淀粉颗粒。其主要构成是由直链淀粉和支链淀粉组成,结晶区主要有支链淀粉组成,也含有少量直链淀粉(直链淀粉含量仪);大部分直链淀粉形成无定形区。结晶区和无定形区折射率和密度不同,从而在偏光显微镜下观察淀粉颗粒时会产生偏光十字。不同种类玉米淀粉偏光十字位置、性状及明显程度都有差异,偏光十字明显程度受淀粉颗粒大小和结晶程度影响。直链淀粉含量影响淀粉结晶程度,直链淀粉含量越高,结晶度越低。

Starch granules were formed in the amorphous region and the crystalline region alternately. Its main composition is composed of amylose and amylopectin. The crystal region is mainly composed of amylopectin and a small amount of amylose (amylose content meter); Most amylose forms amorphous region. The refractive index and density of crystalline region and amorphous region are different, so polarized cross will appear when starch granules are observed under polarized light microscope. The results showed that the position, character and obvious degree of polarization cross of different kinds of corn starch were different. The obvious degree of polarization cross was affected by starch granule size and crystal degree. The higher the amylose content, the lower the crystallinity.
相关研究发现:随直链淀粉增加,玉米淀粉颗粒平均粒径和结晶度逐渐减小,偏光十字明显程度也会随之减弱。按偏光十字明显程度和结晶度都满足,依次为:蜡质玉米淀粉>普通玉米淀粉>高直链玉米淀粉。李佳佳等使用扫描电子显微镜观察结果显示,蜡质玉米淀粉多呈不规则多角形;而普通玉米淀粉和蜡质玉米淀粉相似,大多数呈不规则多角形,少部分为球形。且高直链玉米淀粉颗粒直径比蜡质玉米淀粉和普通玉米淀粉都小。
It was found that with the increase of amylose, the average grain size and crystallinity of corn starch decreased gradually, and the degree of polarization cross also decreased. According to the obvious degree and crystallinity of polarization cross, the order is waxy corn starch > common corn starch > high amylose corn starch. The results of SEM showed that waxy corn starch was irregular polygon; However, common corn starch is similar to waxy corn starch, most of them are irregular polygonal, and a few of them are spherical. The diameter of high amylose corn starch was smaller than that of waxy corn starch and common corn starch.
利用光学显微镜观察三种不同直链淀粉含量玉米淀粉结构发现,以颗粒大小和均匀程度而言,26%普通玉米淀粉>50%高直链玉米淀粉>70%高直链玉米淀粉。且26%普通玉米淀粉颗粒形貌近似圆形,而50%和70%高直链玉米淀粉颗粒形貌都近似椭圆形。通过扫描电子显微镜(SEM)观察,也证实高直链玉米淀粉大多数为椭圆形,少数为不规则形状。
The results showed that 26% normal corn starch > 50% high amylose corn starch > 70% high amylose corn starch in terms of particle size and uniformity. The morphology of 26% normal corn starch granules was round, while that of 50% and 70% high amylose corn starch granules was oval. Scanning electron microscopy (SEM) also confirmed that most of the high amylose corn starch was oval, and a few were irregular.
对高直链玉米淀粉、蜡质玉米淀粉和普通玉米淀粉进行粒度分布实验。通过分析粒度分布图表明,普通玉米淀粉和蜡质玉米淀粉粒度分布情况(包括:径距、比表面积、表面积平均粒径、体积平均粒度等)基本相同,粒径大值与小值差距较小;而高直链玉米淀粉上述参数比另外两种玉米淀粉大,且粒径大值与小值差距也较大,粒径分布相对较均匀。
The particle size distribution of high amylose corn starch, waxy corn starch and common corn starch was studied. The results showed that the grain size distribution of common corn starch and waxy corn starch (including diameter distance, specific surface area, surface area average particle size, volume average particle size, etc.) were basically the same, and the difference between the large and small value of grain size was small; However, the above parameters of high amylose corn starch are larger than those of the other two kinds of corn starch, and the difference between the large and small values of grain size is also large, and the distribution of grain size is relatively uniform.
通过对十种普通玉米淀粉研究发现,淀粉直链淀粉含量与平均粒径成正相关;在此研究中,直链淀粉含量范围为26.5%~30.26%,平均粒径为14.76~16.64%。直链淀粉含量不同玉米淀粉,其晶体结构不同,会呈现不同晶型。
Through the study of ten kinds of common corn starch, it was found that amylose content was positively correlated with average grain size; In this study, the amylose content ranged from 26.5% to 30.26%, and the average particle size ranged from 14.76% to 16.64%. Corn starch with different amylose content has different crystal structure and different crystal forms.