Objective: To evaluate retinol concentration in colostrum samples collected with a 24 hour interval.Methods: Colostrum was collected from 24 recently-delivered mothers at two points in time, 0 hours (T0) and 24 hours later (T24), and a pooled sample of colostrum from T0 and T24 was also analyzed. Fat content was determined by creamatocrit, and retinol assayed by high performance liquid chromatography.Results: When expressed in terms of volume of milk (µg/dL), retinol levels varied across T0, T24 and the pooled sample: 94.9±58.9, 129±78.6 and 111.9±60.4 µg/dL, respectively. However, when expressed with relation to fat content (µg/g), no significant difference was observed.

Evaluation of retinol levels in human colostrum in two samples collected at an interval of 24 hours Avaliação dos níveis de retinol no colostro humano coletado no intervalo de 24 horas