Abstract
Citrus fruits and juices are recognized as one of the most healthful components of the human diet. Limonin is a bitter compound, highly oxygenated triterpenoid, that occurs as aglycones in some citrus fruits.The aim of this work was to (i) complex limonin in cyclodextrins to reduce bitterness in orange juice and (ii) evaluate limonin anti-inflammatory activity, in standard solutions and orange juice, in in vivo acute and chronic models. Two local in vivo inflammation models were used (i) an acute (carrageenan-induced paw edema) and (ii) a chronic (collagen-induced arthritis). In both models, the results showed a significant reduction of the volume of the edema. The radiographic examination of the hind paws confirmed that administration of limonin was able to reduce the degree of bone resorption, soft tissue swelling and osteophyte formation, improving articular function in treated animals. These results are very promising for the implementation of a bitter taste reduction of limonin in citrus juices by complexation in cyclodextrins with the maintenance of anti-inflammatory activity and may open new applications in food area.
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