ABSTRACT
Astaxanthin has been used as a colorant and antioxidant with excellent results, its application and stability in food matrices to human consumption has been little studied. The aim of this work was the incorporation of astaxanthin oleoresin to milks with different fat content, simulating the red-orange color that can impart apricot fruit. For astaxanthin determination by HPLC, a methodology was implemented for its extraction from the food matrix, followed by saponification with KOH. Milk samples were stored (5 ± 2 °C) and stability of color and astaxanthin content were determined by colorimetry and high performance liquid chromatography each 24 h for a week. Pigment degradation followed first-order kinetic with a constant degradation of 0.259 day(-1) and 0.104 day(-1), in whole and semi-skimmed milk, respectively. Chromaticity coordinates L*, a*, b* for different types of milk showed a low dispersion of their values during the storage time, indicating high stability of astaxanthin within the matrix.
ABSTRACT
The literature suggests an adverse impact of maternal stress related to interpersonal violence on parent-child interaction. The current study investigated associations between a mother's self-reported parent-child relationship dysfunction and what she does in response to her child's cues. It also examined whether maternal perception of parent-child dysfunctional interaction and child behavior when stressed by separation, along with maternal behavior in response to child distress, predicted impaired joint attention (JA) during play. Participant mothers (n = 74) and their children ages 12-48 months were recruited from community pediatrics clinics and completed two videotaped visits. After correlations, multiple linear regression was applied to find the best model fit that would predict outcomes of interest. We found that both maternal subjective report of self-reported parent-child relationship dysfunction and observed child separation distress together predicted atypical maternal behavior. Self-reported parent-child relationship dysfunction, observed atypical maternal behavior, and child separation distress combined significantly predicted less time spent in joint attention during play. Maternal posttraumatic stress predicted less maternal availability after separation stress. Clinicians should thus carefully assess and listen to parents' communication of disturbances in their relationship with their young child. Left untreated, parent-child relationship dysfunction may well lead to impairment in learning and social-emotional development.
