淀粉晶体结构测定方法

conclusion
XRD, IR, AMF and SSNMR technology can be used to determine the starch granule crystal structure type, degree of crystallinity, threedimensional distribution, relative content of double helix structure respectively. However, in order to solve the problem of starch crystal now, these methods should be combined.
X-ray diffraction patterns
Atomic force microscopy (AFM)
Principle of AFM
Two decades have passed since the invention of AFM and AFM has been used to study starch structure for more than 10 years.
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AFM images of sectioned potato starch
infrared spectroscopy (IR)
Near Infrared, NIR) ► 傅立叶变换红外光谱( Fourier Transform Infrared Spectrocopy, FTIR) ► 衰减全反射傅里叶变换红外光谱(Attenuated Total Internal Reflectance Fourier Transform Infrared Spectroscopy, ATR-FTIR)
Advantage and Characteristic
Since AFM can only be used to scan the surface of granules, it can not detect or reflect the inner or ultra-structure and organizations of the starch granules. Thus it can only offer limited information and is mainly used in initial studies, such as the arrangement of starch granule crystal, the micro crystalline and the form of amorphous constitute nanometer structure.
Solid State Nuclear Magnetic Resonance
SSNMR can reflect crystalline structure of starch granule on the double helix structure level with quantitative analysis method.
The Determination Methods of Crystal Structures of Starch
X-ray diffraction (XRD)
Principle of XRD
Starch crystaΒιβλιοθήκη Baidu can produce to X-ray diffraction effects, with this technology we can determine crystalline substance in the atomic level.
► 现代近红外光谱(
Advantage and Characteristic
IR can reveal the structure of starch granula crystal by qualitative and quantitative analysis, and it also can reveal modified starch and replace group with qualitative and quantitative research. As a result , IR can detect molecular conformation and spiral structure and their change.
Advantage and Characteristic
XRD can provide relative quantity information of starch crystal area and amorphous area, and it can also provide starch grains microcrystalline structure information. Native starch granules show three forms of crystalline structures, referred to as the A, B, C type according to XRD, and vary in their crystallinity from 15 % to 45%.