Yes... there are many categories of phytochemicals possessing antioxidant activity other than polyphenols. Coumarins, furanocoumarins, flavonoids, flavonols are some of the examples.
While flavonoids (a sub-categories of which are flavonols) are actually polyphenols, carotenoids, with a totally different structure, also exhibit significant antioxidant activities.
Steroids and triterpenes have also been reported to possess antioxidant activity. They have proved to be potent antioxidants in many cases.
Also simple phenols like carvacrol and thymol possess good antioxidant properties. Their contribution is relevant in some essential oils. Fibers, like those of baobab, are also quite good and some alkaloids like β-carbolinic alkaloids are efficient scavengers, but the toxicity the latters makes them not relevant. And let's not forget that Vitamin C and E are also phytochemicals!
put nordihydroguaretic acid (NDGA) in your assay and be amazed -- also known as 4,4'-(2,3-dimethyl-1,4-butanediyl)bis-1,2-benzenediol
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