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Background  Diabetes mellitus is a metabolic disorder of epidemic proportion, projected to become the major cause of morbidity and mortality in the world in future. Despite extensive research in understanding this disease at molecular level, and the discovery of new drugs, diabetes and its complications remain largely untreated. Many of the late diabetic complications are associated with the glycation of proteins in the body. Natural flora has long been a rich source for therapeutic agents, especially against diabetes. The present study deals with the anti-glycation properties of some medicinally important plants of Arabian region.    Methods  Twenty-six medicinal plants, commonly found in different regions of Arabian Peninsula, were evaluated for their protein anti-glycation activity by using BSA-MG glycation assay in-vitro. The extracts were incubated with BSA and MG at 37 °C for 9 days, each sample was then examined for the presence of fluorescence (λex 330 nm, and λem 420 nm), which represent the extent of protein glycation. Antioxidant activity was evaluated by using 1,1-diphenyl- 2-picrylhydrazyl (DPPH), iron chelation, and superoxide radical scavenging asaays.    Results  The data revealed that out of 26 medicinal plants, five plants  viz. Sida cordifolia ,  Plumbago zeylanica ,  Tribulus terrestris ,  Glycyrrhiza glabra , and  Rosa indica  were active against the in-vitro protein glycation with IC 50  values between 0.408- 1.690 mg/mL. Among the active plants,  Glycyrrhiza glabra  L. was found to be the most potent (IC 50  = 0.408 ± 0.027 mg/mL), followed by  Rosa indica  (IC 50  = 0.596 ± 0.0179 mg/mL), and  Sida cordifolia  L. (IC 50  = 0.63 ± 0.009 mg/mL). The antioxidant potential of these plant extracts were also determined by using DPPH (2,2-diphenyl-1-picrylhydrazyl), iron chelation, and superoxide anion radical scavenging assays. Among five plants,  Sida cordifolia  exhibited a potent anti-oxidant activity in both DPPH and superoxide anion radical scavenging assays (IC 50  = 0.005 ± 0.0004, and 0.078 ± 0.002 mg/mL, respectively), followed by  Rosa indica  (IC 50  = 0.023 ± 0.0005 and 0.141 ± 0.003 mg/mL, respectively).    Conclusions  Protein glycation in hyperglycemic conditions involve oxidative changes. Therefore dual inhibition of protein glycation and oxidation are desirable properties in any test substance investigated for therapeutic purposes.

In-Vitro dual inhibition of protein glycation, and oxidation by some Arabian plants