Photometric determination povidone

Fig. 25. Calibration curves for the photometric determination of povidone K 17, povidone K 30 and povidone K 90 with iodine...

The most versatile method for quantitatively determining povidone is probably the photometric measurement of the povidone-iodine complex described in Section 2.3.i.2. It has been successfully tested on samples that also contained a series of auxiliaries and drugs [18]. 

Table 54. Photometric determination of povidone K 25 in the presence of different compounds [ 18]... 

The photometric determination of the iodine complex used to determine povidone can also be used for copovidone, though the colour intensity of the iodine complex only reaches its maximum after about 30 min, after which it slowly fades. Thus, it must be measured after 30 min, instead of 10 min, as in the determination of povidone [18]. 

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See also in sourсe #XX -- [ , ]

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