Should Milk Packaging Also Have "SPF"?
2018-10-18 13:10 Thursday
Every summer, people buy sunscreen with SPF（Sun Protect Factor）to protect their skin from harmful UVB rays in sunlight, which can cause skin cancer. It's common knowledge that skin requires protection against sunlight, but less well known that milk requires higher protection against sunlight than skin.
Studies have shown that when the milk is not packaged in a light-proof way, it loses most of its nutrients after three months of sunlight exposure. Vitamin A decreases by 93%, vitamin D3 by 66%, and vitamin B2 is entirely lost. Since vitamin B2 is closely linked to the taste and freshness of milk, milk that has been exposed to sunlight for a prolonged period has a bad taste. It is not just sunlight that has detrimental effects on milk; most milk shelve space in supermarkets and convenience stores is directly in the glare of fluorescent lights.
Researchers have found that LPF (Light Protect Factor) is an effective tool for evaluating dairy packaging. There is a direct linear relationship between milk flavor and LPF; The higher the LPF value for milk packaging, the longer its shelf life, and the better it preserves nutrition and taste.
Dairy producers can quantify the taste and shelf life of milk by measuring the packaging's LPF value, rather than testing how well the packaging keeps the milk fresh by subjective measures. The inclusion of LPF in milk packaging reduces substantial investments of manpower and time in determining milk freshness, thereby saving money.
LPF can also be applied to other food packaging，such as functional products, and healthy foods and beverages. Food producers should develop LPF solutions for product packaging on a case-by-case basis, according to the packaging materials and product features.