Abstract
Plant extracts from natural and renewable resources have the potential to replace conventional antioxidants in many applications and to increase the stability of lubricants. By specific selection of raw materials and adaptation of extraction parameters, the properties of the additives can be specifically optimized for the respective application. Easy-to-perform photometric assays enable targeted and rapid process adjustment and pre-selection of extracts. Later, they can be evaluated in application-oriented analytical methods, such as the rancimat test, with regard to their effect in the oil. In our analyses, secondary plant compounds increased the oxidation stability by 300 %, whereas the conventional antioxidants only achieved an increase of 200 %.
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