Four fractions of Gloriosa superba L., i.e., hexane fraction, dichloromethane fraction 1, dichloromethane fraction 2, and methanol fraction, were investigated for colchicine-like activity using a mosquito cytogenetic assay. The results revealed that the latter three fractions yielded promisingly high colchicine-like activity, whereas the hexane fraction yielded very low activity compared with 1% colchicine in a 0.85% sodium chloride solution. The metaphase rates and average number of metaphase chromosomes per positive brain ganglion (range) of Aedes aegypti L. larvae after incubation with 0.25–2% solutions of dichloromethane fraction 1, dichloromethane fraction 2, 0.5–2% solutions of methanol fraction, and 1% colchicine solution were 90–100% and 7 (2–19) to 22 (7–47); 90–100% and 4 (1–11) to 30 (4–73); 95–100% and 11 (1–28) to 17 (2–62); and 100% and 6 (2–11), respectively. The temperature stability tests of the three promising fractions were performed by heating 0.5% working solution at 121°C for 15 min and preparing 0.5% working solution from stock frozen at −20°C for 10 mo. These fractions also yielded satisfactory outcomes of metaphase rates and an average number of metaphase chromosomes per positive brain ganglia compared with 1% colchicine solution.
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Vol. 41 • No. 4