For WoS a total of 101 keywords were extracted from 23 studies (Figure ). The words were organized into three clusters as in the case of the Scopus network. The first cluster contains thirteen words, the second eleven, and the third seven words, each with the highest frequency. The most prominent words in these clusters are: "plant", "product" and "use" for the first group; "metabolite", "identification", "research" and "sample" for the second group; and "extract", "seed" and "fruit" in the third group.