Rapid screening of phenolic compounds in extracts of photosynthetic organisms separated using a C18 monolithic column based HPLC-UV method

•A HPLC-UV method was developed to resolve and quantify 23 phenolic compounds from biological extracts.•Chlorogenic acid was the most abundant phenolic compound in blueberry fruit extracts (26.0 mg. kg−1)•Kaempferol was the most abundant phenolic compound in basil leaf extracts (61.4 mg. kg−1)•The same amount of starting biological material used to generate the plant extracts only allowed to putatively detect phenolic compounds in two microalgae species.