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Effect of package light transmittance on the vitamin content of pasteurized whole milk
Author(s) -
Saffert Alexander,
Pieper Gabriele,
Jetten Jan
Publication year - 2006
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.724
Subject(s) - pasteurization , vitamin , food science , riboflavin , polyethylene terephthalate , vitamin b12 , fluorescent light , transmittance , chemistry , materials science , biochemistry , fluorescence , physics , optoelectronics , quantum mechanics , composite material
Pasteurized whole milk (3% fat) was stored under fluorescent light at 8°C in clear 1 litre polyethylene terephthalate (PET) bottles and three variants of pigmented PET bottles with different light transmittance. Changes in the vitamin content were monitored over a period of 10 days. Milk packed in pigmented PET bottles with the lowest light transmittance, which was stored in the dark under the same experimental conditions, served as the ‘control’ sample. Data were obtained for vitamin A (retinol), vitamin B 2 (riboflavin) and vitamin B 12 (cobalamin) content. Standard plate counts were determined to ensure an acceptable microbiological status of the pasteurized milk during the sampling period. In clear PET bottles a reduction of 22% of the initial content was observed for vitamin A and 33% for vitamin B 2 , while the vitamin B 12 content remained almost stable. In all pigmented PET bottles the vitamin retention was significantly higher; the losses were 0–6% for vitamin A and 11–20% for vitamin B 2 , depending on the pigmentation level, as compared to 6% for vitamin A and no significant loss for vitamin B 2 in the ‘control’ sample. An impact of the package light transmittance on the vitamin B 12 content could not be observed. Copyright © 2006 John Wiley & Sons, Ltd.