Phlorotannins are unique phenolic compounds synthesized only by brown seaweeds via the polyketide pathway and located in the algal membrane. They accumulate mainly in surface tissues exposed to light, grazing and oxidative stress.
These molecules act as natural shields, absorbing UV radiation and deterring herbivores. In applied science, phlorotannins are studied for:
The global phlorotannins market was valued at approximately USD 296 million in 2024 and is projected to reach USD 538 million by 2032, growing at a CAGR of 7.8%.
Depending on the market definition, estimates for the global phlorotannin market range from less than USD 20 million to more than USD 300 million, highlighting how early-stage and rapidly evolving this marine bioactive sector still is.