**3.6. Qualitative screening of anthraquinones and anthocyanosides**

The method used for the qualitative screening of anthraquinone compounds involves the reaction of 1 ml aqueous extract with a few drops of 10% ammonia solution with the formation of a pink precipitate.

Anthocyanosides are present when a pink color appears after the reaction between 1 ml aqueous extract with 5 ml dilute hydrochloric acid (1%). The results are detailed in **Table 9**.


**Table 8.** Qualitative screening of alkaloids.


**Table 9.** Qualitative screening of anthraquinones and anthocyanosides.

According to the results presented in **Table 9**, anthraquinones and anthocyanosides are absent from both aqueous extracts.
