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Background  About 425 million adults had diabetes mellitus globally in 2017. Type 2 diabetes accounts for the enormous majority of diabetes cases and it is gradually growing which is predicted to increase by 48% in 2045. Imbalanced cellular carbohydrate and lipid metabolism cause an increase in postprandial blood glucose level which eventually leads to the onset and progression of type 2 diabetes mellitus. The lack of effective and safe carbohydrate hydrolyzing enzyme inhibitors contributes to the increasing prevalence. Thus, this study was targeted to assess the α-amylase inhibitory potential of isolates obtained from  Aloe megalacantha  Baker and  Aloe monticola  Reynolds, which are among the commonly used folkloric remedies for the management of diabetes mellitus.    Method  The α-amylase inhibitory effect of  Aloe megalacantha  Baker and  Aloe monticola  Reynolds were evaluated using the 3,5-dinitro salicylic acid method. 2, 2-Diphenyl-2-picrylhydrazyl free radical scavenging property was also used to test the antioxidant effect of both plants. Results were analysed using GraphPad Prism software version 8.    Results  The more polar isolates (AM 1  and AG 1 ) were possessed stronger α-amylase inhibition activity than the leaves latex and the other strains (AM 2  and AG 2 ). Leaf latex of  A. megalacantha , AM 1 , AM 2  ,  leaf latex of  A. monticola , AG 1 , and AG 2  were found to have an IC 50  value of 74.76 ± 1.98, 37.83 ± 3.31, 96.75 ± 1.98, 78.10 ± 1.88, 56.95 ± 1.88 and 64.03 ± 3.60 μg/mL, respectively ( P < 0.001 ). The leaf latexes of  A. megalacantha  and  A. monticola  showed a significant ( P < 0.001 ) free radical hunting property with an IC 50  value of 890.1 ± 1.73 and 597.5 ± 2.02 μg/mL, respectively.    Conclusion  Hence, the outcomes of the present investigation partly justify the acclaimed use of  Aloe megalacantha  and  Aloe monticola  for the treatment of diabetes.

In vitro α-amylase inhibitory effect of TLC isolates of Aloe megalacantha baker and Aloe monticola Reynolds