Permeability of the amniotic membranes to the natural vanilla molecule.

Research paper by Carlos N CN López Ramón Y Cajal, Laura L Gonzalez Rodriguez

Indexed on: 20 Dec '18Published on: 20 Dec '18Published in: The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians


We studied natural vanilla permeability through amniotic membranes. We studied natural vanilla permeability through amniotic membranes obtained from forty-five spontaneous normal deliveries at term. The ferric chloride test (FeCL) was used to determine the presence or absence of phenols in a given sample. Vanilla is a polyphenol so it gives a reaction to FeCL with an intense color change. The diffusion of the vanilla was checked by dropping ferric chloride solution on the gauze once the membranes are lifted with care to avoid contamination. If vanilla has passed through the membranes the distilled water papers would change from an initial ferric yellow in the drops towards a marked gray / greenish color on the papers (positive test). In all cases, the swabs were stained, all the membranes in both directions were permeable to the whole vanilla molecule. This experiment allows us to reevaluate the importance of molecular diffusion through the amniotic membranes with no placental metabolism existing between maternal and fetal environment.