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Pharmaceutical Manufacturing Handbook: Production and

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OH (3) OH (2)<br />

HOCH 2<br />

HOCH 2<br />

O<br />

O<br />

OH<br />

O<br />

OH<br />

O<br />

Primary face<br />

Apolar cavity<br />

Secondary face<br />

O O<br />

OH<br />

OH<br />

OH<br />

OH<br />

HO<br />

OH (6 )<br />

CH2OH O<br />

O<br />

HO<br />

CH2OH CH2OH O<br />

CH 2OH<br />

CH 2OH<br />

FIGURE 1 Schematic representation of natural CD structure <strong>and</strong> modifi cation sites.<br />

HO<br />

HO<br />

3<br />

O<br />

HO<br />

2<br />

HO<br />

OH<br />

O<br />

Modification<br />

sites<br />

TABLE 1 Some Physicochemical Characteristics of Natural Cyclodextrins<br />

Characteristics<br />

α - CD β - CD<br />

Number of glucose units<br />

6<br />

7<br />

Molecular weight, g/mol<br />

972<br />

1135<br />

Internal diameter, Å<br />

4.7 – 5.2 6.0 – 6.4<br />

External diameter, Å<br />

14.2 – 15.0 15.0 – 15.8<br />

Depth, Å<br />

7.9 – 8.0 7.9 – 8.0<br />

Solubility in water (25 ° C), g/L<br />

145<br />

18.5<br />

Crystal water, w %<br />

10.2 13.2 – 14.5<br />

Approximative cavity volume in 1 mol<br />

CD, Å 3<br />

174<br />

262<br />

Melting point, ° C<br />

250 – 260 255 – 265<br />

Half - life in 1 M HCl at 60 ° C, h<br />

6.2<br />

5.4<br />

Crystal forms (from water)<br />

Hexagonal Monoclinic<br />

plate parallelogram<br />

Partial molar volumes in solution, mL/mol 611.4<br />

703.8<br />

HO<br />

O<br />

O<br />

O<br />

INTRODUCTION 1227<br />

6<br />

γ - CD<br />

8<br />

1297<br />

7.5 – 8.3<br />

17.1 – 17.9<br />

7.9 – 8.0<br />

232<br />

8.13 – 17.7<br />

472<br />

240 – 245<br />

3.0<br />

Quadratic<br />

prism<br />

801.2

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