Short communication: Mycosporine-like amino acids protect natamycin against photodegradation in milk exposed to fluorescent or light-emitting diode light

摘要

Natamycin has been used as a natural antimicrobialin dairy products, but the poor light stability of natamycincan limit usefulness in food products. Mycosporine-like amino acids are strong UV absorbers andmight be useful as an additive to decrease light-induceddegradations. Therefore, the objective of this study wasto evaluate the photoprotective effect of mycosporinelikeamino acids (MAA) in cow milk stored under 2lighting conditions in retail commercial display cabinetswith fluorescent and high intensity light-emittingdiode illumination. When milk was exposed to bothfluorescent and light-emitting diode light, natamycindegradation was very fast, and only 17.1 ± 0.9% of itsoriginal concentration was observed after 8 d at 4.0°C.On the other hand, by adding MAA into milk, natamycinwas retained at 82.2 ± 0.9% and 92.2 ± 0.9%when low and high MAA levels were used, respectively.However, high MAA levels resulted in color changes.Therefore, MAA at low levels had a photoprotectiveeffect for natamycin stability in cow milk exposed tolight in refrigerated glass containers.