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Characterization of Rabbit Corneas Subjected to Stromal Stiffening by the Açaí Extract (Euterpe oleracea)
Patrícia A Bersanetti1,2, Tatiane L N Bueno2, Andreia de A Morandim-Giannetti3
1a Departamento de Informática em Saúde , Escola Paulista de Medicina, Universidade Federal de São Paulo , São Paulo , Brazil.
Purpose:
In this study, we characterized rabbit corneas subjected to corneal cross-linking (CXL) with açaí extract compared with a riboflavin photo-stimulated procedure.
Materials And Methods:
The corneas of the slaughterhouse rabbits were divided into three groups: control, consisting of untreated corneal samples; riboflavin/UVA, where corneas were treated with 0.1% riboflavin photo-stimulated at 365 nm as the standard protocol; and açaí, where the samples were subjected to 4% açaí extract for 0.5-2 h. After the CXL procedure, corneas of the three groups were characterized by analyzing their elastic modulus and thermal denaturation profile.
Results:
The elastic modulus at 3% strain showed an approximately threefold increase in the riboflavin/UVA group and 10.5 times in the corneas treated with 4% açaí extract for 2 h, compared with the control group (p < 0.01). The denaturation temperature values of the two groups of crosslinked corneas increased significantly (p < 0.05) and were more pronounced in the açaí group.
Conclusions:
The açaí extract was effective in promoting CXL in rabbit corneas as characterized by the different techniques.
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