Influence of Maternal Age and Gestational Age on Breast Milk Antioxidants During the First Month of Lactation

• Main Authors: Andrea Gila-Díaz, Gloria Herranz Carrillo, Silvia Cañas, Miguel Saenz de Pipaón, José Antonio Martínez-Orgado, Pilar Rodríguez-Rodríguez, Ángel Luis López de Pablo, María A. Martin-Cabrejas, David Ramiro-Cortijo, Silvia M. Arribas
• Format: Article
• Language: English
• Published: MDPI AG 2020-08-01
• Series: Nutrients
• Subjects: antioxidant; breast milk; gestational age; maternal age; melatonin
• Online Access: https://www.mdpi.com/2072-6643/12/9/2569

Breast milk (BM) is beneficial due to its content in a wide range of different antioxidants, particularly relevant for preterm infants, who are at higher risk of oxidative stress. We hypothesize that BM antioxidants are adapted to gestational age and are negatively influenced by maternal age. Fifty breastfeeding women from two hospitals (Madrid, Spain) provided BM samples at days 7, 14 and 28 of lactation to assess total antioxidant capacity (ABTS), thiol groups, reduced glutathione (GSH), superoxide dismutase (SOD) and catalase activities, lipid peroxidation (malondialdehyde, MDA + 4-Hydroxy-Trans-2-Nonenal, HNE), protein oxidation (carbonyl groups) (spectrophotometry) and melatonin (ELISA). Mixed random-effects linear regression models were used to study the influence of maternal and gestational ages on BM antioxidants, adjusted by days of lactation. Regression models evidenced a negative association between maternal age and BM melatonin levels (β = −7.4 ± 2.5; <i>p</i>-value = 0.005); and a negative association between gestational age and BM total antioxidant capacity (β = −0.008 ± 0.003; <i>p</i>-value = 0.006), SOD activity (β = −0.002 ± 0.001; <i>p</i>-value = 0.043) and protein oxidation (β = −0.22 ± 0.07; <i>p</i>-value = 0.001). In conclusion, BM antioxidants are adapted to gestational age providing higher levels to infants with lower degree of maturation; maternal ageing has a negative influence on melatonin, a key antioxidant hormone.