Figure 3. Thin layer chromatograms of culture filtrates of two clinical and one environmental isolate of Aspergillus flavus. L1: aflatoxin B1 was not detected in the extract from the culture filatrate of test strain C2 (aflatoxin-non producing clinical strain). L2: aflatoxin B1 was detected in the extract from the culture filtrate of test strain C1 (aflatoxin-producing clinical strain). L3: aflatoxin B1 was detected in the extract from the culture filtrate of the test strain E1 (aflatoxin-producing environmental strain). L4: aflatoxin B1 standard was loaded for confirmation.