Identification of the chemical constituents of the Annona muricata L. seeds with coagulating properties on domestic wastewater

In the same vision of the valorization of the species Annona muricata L. (Annonaceae) and with regard to the previous scientific data collected on this plant species, a study was initiated to search for chemical constituents of seeds of this plant which could have the clarifying (coagulant) properties of domestic wastewater. The results obtained show that these seeds contain carbohydrates, proteins, lipids, terpenes and sterols in its almonds and integuments ; flavonoids and tannins in its integuments with significant contents of organic compounds (66.15 %) as well as mineral compounds (00.97 %) and volatile compounds (32.88 %). The vegetable oil (lipids) extracted is 30.56 % in these seeds. The evaluation of the clarifying activity of soursop seeds on samples of domestic wastewater with turbidities of 160 and 259 NTU showed that these seeds have a reduction rate of colloids or suspended matter of 95.40 % with the solution of its almonds and 97.58 % with the solution of its almond cakes at respective doses of 4800 mg powder/L and 3200 mg powder/L in 30 minutes. The results obtained prove that these seeds contain 35.59 % of other organic compounds (proteins, amino acids, carbohydrates and starch) which are responsible for this water clarifying activity. It is important to note that to our knowledge, the indications given on the activity of clarifying wastewater by the seeds of this fruit have not yet been the subject of scientific work making it possible to identify some of the compounds responsible for this activity in these glitches.