Although phenols are widely present in compounds of natural origin (lignin, carotenoids, flavonoids, etc.), most antioxidants are fossil-based. However, some antioxidants of sustainable origin are more effective than many of the fossil-based bulky phenols used in industry. But most bio-based antioxidants, such as lignins, cause undesirable coloration of polymeric materials . Moreover, their solubility is limited, especially in apolar matrices such as TPO, due to their intrinsic polarity .