11/6/2022 0 Comments Shelf stable milk![]() However, shelf-stable milk has met with limited acceptability by the consumer, especially in the United States, due in part to a high cooked flavor. Conventional pasteurization methods have long been in place and with the advent of UHT technology, the sterilization of fluid milk was achieved using higher temperature treatments for shorter periods. In turn, these processes produce extreme cooked flavors, often attributed to changes in the sulfhydryl and disulfide content of the protein fraction ( Swaisgood et al., 1987). Often, heat treatment causes milkfat globule membrane proteins and whey proteins to unfold such that buried sulfhydryl (-SH-) groups, normally masked in the native protein, are exposed to the outer surfaces ( Hoffmann and van Mill, 1997). The introduction to a 2005 study published in the Journal of Dairy Science highlighted the current problems with UHT processing from an industry point of view: Now, almost all of the organic milk and the majority of conventional milk available in U.S. They’d sell the milk in normal packaging, in the refrigerator aisle, and none of us would be the wiser. They could extend the shelf life of their product and not advertise that they were doing it. ![]() We like our milk cold, and UHT milk doesn’t need to be refrigerated. ![]() Americans distrust milk that hasn’t been refrigerated. When the world’s foremost UHT milk processor, Parmalat, first introduced UHT milk to the U.S. UHT milk has a shelf life of 6 to 9 months (until opened). government definition of an ultra-pasteurized dairy product stipulates “such product shall have been thermally processed at or above 280° F for at least 2 seconds, either before or after packaging, so as to produce a product which has an extended shelf life.” It’s why I don’t drink most store-bought organic milk. In fact, more than 80% of the organic milk sold in the U.S. ![]() The milk had been ultra-high temperature pasteurized. After all, that’s what I’d drunk for years before making the switch to raw milk from grass-fed cows. Yet I hadn’t expected to respond so negatively to the glass of Horizon organic milk my friend poured for me. ![]()
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