Overview

Skyr is a traditional Icelandic cultured dairy product with characteristics of both yogurt and fresh cheese. It has been produced in Iceland for over a millennium and is notable for its high protein content and low fat levels.

Raw Materials

  • Skimmed cow’s milk
  • Starter cultures
  • Rennet (traditional preparation)

Fermentation Process

Milk is heated, cooled, and inoculated with defined lactic acid bacterial cultures. Fermentation occurs at controlled temperatures, followed by straining to remove whey, resulting in a thick, protein-rich product.

Microbial Ecology

The fermentation is dominated by:

  • Lactococcus lactis
  • Streptococcus thermophilus

These bacteria drive acidification and texture development.

Functional and Nutritional Aspects

  • High protein concentration
  • Improved lactose digestibility
  • Long refrigerated shelf-life compared to fresh milk

Cultural Significance

Skyr is a cornerstone of Icelandic food culture and exemplifies the adaptation of dairy fermentation to cold-climate environments.

References

  1. Tamime, A. Y., & Robinson, R. K. (2007). Yoghurt: Science and Technology. Woodhead Publishing.
  2. Walstra, P., Wouters, J. T. M., & Geurts, T. J. (2006). Dairy Science and Technology. CRC Press.
  3. Steinkraus, K. H. (1996). Handbook of Indigenous Fermented Foods. Marcel Dekker, New York.