Polyamide powder characteristics

Chemical Characteristics of the Oxidative Fluorescence-Producing Reaction and Presumptive Implication of Malonaldehyde The reaction producing measurable fluorescence on polyamide powder can be carried out in the gas phase by exposure to the volatiles from oxidizing polyunsaturated lipids, whether acids, esters, triglycerides, or phosphatides. It can be also carried out within either the oil phase or a water emulsion, and, as noted above, it can be followed in the vapor above an emulsion, providing the pH is 5.5 or below. 

There are several stationary phases that can be used for separation of various compounds including lipids, natural products, biological compounds, drugs, etc. Examples are Celite (Supelco Inc., PA), cellulose powder, ion-exchange cellulose, starch, polyamides and Sephadex (Supelco Inc., PA), but the most popular ones for lipid separations include silica gel, alumina and kieselguhr. These adsorbents can also be modified by impregnation with other substances so as to achieve the desired separations. Based on their characteristics these phases can be classified as normal or reversed. 

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