Oxidized polyolefins, hydroperoxide detection

Oxidized LDL antibodies, immunoassay, 633 Oxidized polyolefins, hydroperoxide detection, 673... 

Reviews appeared on the following subjects Analysis of lipid hydroperoxides , the difficulties encountered for hydroperoxide analysis in a plasma matrix , post-column derivatization after GLC of lipid hydroperoxides and methods for detection and characterization of hydroperoxy groups in oxidized polyolefins . 

A Review of Methods for Detecting and Characterizing Hydroperoxide Groups m Oxidized Polyolefins, Polymer Plastics Technology and Engineering, 34 (1945), p. 97... 

The formation and role of hydroperoxide groups, particularly in the early stages of polymer oxidation is well discussed in the introduction to the next chapter and also features in many of the references cited in this chapter. Their detection and quantification is therefore important. Although this can be done directly or implicitly through many of the instrumentation techniques discussed in this chapter, there are several tests that have been developed, some of which are still widely used, that are based more on chemical methods, titration or staining. The majority have been applied to polyolefins, especially polyethylene. 

Staining techniques for detecting localised oxidation in HDPE powders and films were reviewed [237]. Optical absorbance following staining with 2,4-dinitrophenylhydrazine (DNPH) can be used as a measure of the aldehyde/ketone content in oxidised polyolefins. SO2 treatment enables regions with high concentrations of hydroperoxides to be clearly distinguished. 

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