クロラムフェニコール長鎖状エステルのPolymorphism (第3報)

X線によるポリモルフィズムの定量

抄録

Polymorphism of chloramphenicol was examined by the X-ray diffraction method and quantitative relationship between the two crystal forms was examined. In general, proportionation of concentration to diffraction intensity can be quantitated in polymorphs but the method was inconvenient for use with organic compounds due to strict packing conditions. In the binary system (α- and β-forms) of chloramphenicol palmitate, specific intensity and specific concentration of the component were in proportion and quantitative straight line independent of packing codition was obtained. This was found to be effective in the range of over 3% of the β-form and precision is within 1%. As the quantitative linear equation: the following was obtained: x_β/x_α=(0.347±0.005)⋅I_β/I_α, where x is the concentration of the component and I is the intensity of reflection.