PGPR stands for Polyglycerol Polyricinoleate, or E476, which is another type of emulsifier used in the food industry. Polyglycerol Polyricinoleate emulsifier is derived from polyglycerol and ricinoleic acid, typically obtained from castor oil. It consists of polyglycerol esters of polycondensed fatty acids, primarily ricinoleic acid. https://www.cnchemsino.com/products/pgpr/