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Nano-encapsulation is applied for the preparation of functional food to preserve micronutrients degradation and to ameliorate their absorption. Being nano-encapsulation already related to increased vitamin A embryotoxicity, we aimed to evaluate the effect of traditionally formulated (BULK-A) and nano-encapsulated vitamin A (NANO-A) in two different vertebrate models: rat post implantation Whole Embryo Culture (WEC) and Frog Embryo Teratogenesis Assay-Xenopus (FETAX). After benchmark-dose modelling, WEC results showed that NANO-A was 7 times more effective than BULK-A, while FETAX results indicated that X. laevis development was affected only by NANO-A. The relative potency of WEC was 14 times the potency of FETAX, suggesting a minor role of preformed vitamin A in X. laevis development in respect to mammal embryogenesis. Results from this work prompt the necessity to monitor the use of food supplemented with NANO A, since even low doses can elicit teratogenic effects on vertebrate embryos due to its increased bioavailability.

Teratogenic Potential of Traditionally Formulated and Nano-Encapsulated Vitamin A in Two Vertebrate Models, Rattus norvegicus and Xenopus Laevis