The Associations Between Light Exposure During Pumping and Holder Pasteurization and the Macronutrient and Vitamin Concentrations in Human Milk

Abstract

Background

During pumping, storage, and pasteurization human milk is exposed to light, which could affect the concentrations of light-sensitive vitamins. Currently, milk banks do not regulate light exposure.

Research Aim

The aim of this paper was to determine the influence of light exposure during pumping, storage, and pasteurization on (1) macronutrients, (2) select water-soluble vitamins, and (3) select fat-soluble vitamins.

Methods

All 13 participants donated 4 milk samples each. Each sample underwent 1 of 4 treatments: raw and light protected, raw and light exposed, pasteurized and light protected, and pasteurized and light exposed. Samples were analyzed for macronutrients and Vitamins B₁, B₂, retinol, γ-tocopherol, α-tocopherol, and β-carotene.

Results

β-carotene concentrations were not influenced by light exposure. Vitamin B₁ was significantly (p < 0.05) affected by light-exposure (M = 0.23, SD = 0.01mg/L) compared to light-protected (M = 0.27, SD = 0.01mg/L) samples. Vitamin B₂ concentrations were reduced (p < 0.05) by light-exposure in raw (M = 62.1, SD = 0.61µg/L) and pasteurized (M = 73.7, SD = 0.72µg/L) samples compared to light-protected raw samples (M = 99.7, SD = 0.66µg/L). No other tested nutrients were affected by light exposure.

Conclusions

If milk is exposed to excessive amounts of light, Vitamins B₁ and B₂ concentrations may degrade below the current Adequate Intake recommendations for infants 0–6 months of age, increasing the risk of insufficient vitamin supply to the exclusively human milk-fed infant. Thus, pumped or processed human milk should be protected from light to preserve milk vitamin concentrations.

Keywords

breastfeeding breast pumping human milk collection milk banking milk composition pumping

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