Abstract
Aims: The aim of this study to detect Anti-giardia, antioxidant activities, cytotoxicity and evaluated the chemical constituent of ethanolic extracts of Abutilon pannosum and Cassia occidentalis. 
 Study Design: Various standard methods were used to detect of bioactivity for ethanolic extracts of plants used in this study.
 Place and Duration of Study: This study was conducted in the laboratories of microbiology and parasitology and chemistry, the International University of Africa, Khartoum, Sudan, during May 2019.
 Methodology: The ethanolic extract of Abutilon pannosum and Cassia occidentalis was used as an anti-giardia and anti-oxidant in-vitro, and toxicity tests were performed using brine shrimp and MTT assay. Also, the compounds of the plants used were detected by the GCMS apparatus.
 Results: The ethanolic extracts of Abutilon pannosum showed high Anti-giardia activity (79%) in concentration (500 ppm) after 72 hours, whereas the activity of Cassia occidentalis extract showed (61%). The highest antioxidant activity of ethanolic extract of Cassia occidentalis was (68.7%), while it was weak in Abutilon pannosum ethanolic extract (45%) by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The results of cytotoxicity revealed that the ethanolic extracts are highly toxic to brine shrimp, but are not toxic to normal cell line (MTT). Chromatographic analysis using gas chromatography-mass spectroscopy (GCMS) showed good separation of compounds. GCMS detected 22 and14 important compounds in Abutilon pannosum and Cassia occidentalis extracts respectively. The common compound in both plant extracts is n-Hexadecanoic acid. This acid was reported as an antioxidant.
 Conclusion: This study revealed that the biological activities of Abutilon pannosum extracts showed high activities of Anti-giardia and antioxidants. Non-cytotoxic in the normal cell line was shown. Cassia occidentalis showed high activity of Anti-giardia and weak activity antioxidant.
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