With the growing popularity of vegetarianism today, the "meat and vegetarian" attribute of cheese has become a topic of great concern. The key factor in determining whether cheese is "meat and vegetarian" lies in the source of chymosin.
1. Animal-Sourced Chymosin
Traditionally, cheese production relies on chymosin extracted from the gastric mucosa of mammals (e.g., calves). It specifically cleaves the peptide bond between Phe105 and Met106 in κ-casein in milk, disrupting casein micelles to coagulate milk and form the base of cheese. Since this chymosin is directly derived from animals, cheese containing animal-sourced chymosin is not suitable for strict vegetarians.
2. Plant-Sourced Chymosin
Different from animal-sourced chymosin which comes from animals, plant-sourced chymosin has become an important choice to meet the needs of vegetarians. This kind of chymosin is extracted from specific plants, such as Papaya and pineapples. These plants contain natural chymosin, which can coagulate milk and form the structure required for cheese. The use of plant-sourced chymosin not only meets vegetarians' requirements but also imparts a fresh fruity aroma to cheese.
3. Microbial-Sourced Chymosin
In addition to plant-sourced chymosin, microbial-sourced chymosin is also a common substitute. It is mainly produced through the fermentation of Mucor miehei and Kluyveromyces, without animal components are added or involved in the entire production process, so it is also suitable for vegetarians. This type of microbial-sourced chymosin is not only environmentally friendly but also features a more controllable production process. It is suitable for large-scale production and can ensure the quality and taste of cheese.
The debate over whether cheese is "vegetarian or non-vegetarian" ultimately boils down to the source of chymosin. This distinction not only reflects concern for animal welfare but also meets the dietary needs of different consumers. By choosing chymosin that fits your needs, you can easily control the quality, flavor, and nature of the cheese, ensuring a smooth experience every time you make it.