Blue cheese is believed to have been discovered by accident when cheeses were stored in caves with naturally controlled temperature and moisture levels which happened to be favorable environments for varieties of harmless mold.[4] Analysis of paleofeces sampled in the salt mines of Hallstatt (Austria) showed that miners of the Hallstatt Period (800 to 400 BC) already consumed blue cheese and beer.[5]
According to legend, one of the first blue cheeses, Roquefort, was discovered when a young boy, eating bread and ewes' milk cheese, abandoned his meal in a nearby cave after seeing a beautiful girl in the distance. When he returned months later, the mold (Penicillium roqueforti) had transformed his cheese into Roquefort.[6][7]
Gorgonzola is one of the oldest known blue cheeses, having been created around AD 879, though it is said that it did not contain blue veins until around the 11th century.[8][9] Stilton is a relatively new addition, becoming popular sometime in the early 1700s.[10] Many varieties of blue cheese originated subsequently, such as the 20th century Danablu and Cambozola, were an attempt to fill the demand for Roquefort-style cheeses.
Similarly to other varieties of cheese, the process of making blue cheese consists of six standard steps. However, additional ingredients and processes are required to give this blue-veined cheese its particular properties. To begin with, the commercial scale production of blue cheese consists of two phases: the culturing of suitable spore-rich inocula and fermentation for maximum, typical flavor.[11]
In the first phase of production, a Penicillium roqueforti inoculum is prepared prior to the actual production of blue cheese.[12] Multiple methods can be used to achieve this. However, all methods involve the use of a freeze-dried Penicillium roqueforti culture. Although Penicillium roqueforti can be found naturally, cheese producers nowadays use commercially manufactured Penicillium roqueforti. First, Penicillium roqueforti is washed from a pure culture agar plants which is later frozen.[12] Through the freeze drying process, water from the frozen state is evaporated without the transition through the liquid state (sublimation). This retains the value of the culture and is activated upon the addition of water.
First, raw milk (either from cattle, goats or sheep) is mixed and pasteurized at 72 ÂC (162 ÂF) for 15 seconds.[14] Then, acidification occurs: a starter culture, such as Streptococcus lactis, is added in order to change lactose to lactic acid, thus changing the acidity of the milk and turning it from liquid to solid.[15] The next step is coagulation, where rennet, a mixture of rennin and other material found in the stomach lining of a calf is added to solidify the milk further.[15] Following this, thick curds are cut typically with a knife to encourage the release of liquid or whey.[15] The smaller the curds are cut, the thicker and harder the resulting cheese will become.[15]
Throughout the ripening process, the total ketone content is constantly monitored as the distinctive flavor and aroma of blue cheese arises from methyl ketones (including 2-pentanone, 2-heptanone, and 2-nonanone)[16] which are a metabolic product of Penicillium roqueforti.[17][18] Once the specified level of total ketone production is attained, the blue cheese is sterilized at ultra high temperature/short time at 130 ÂC (266 ÂF) for four seconds.[12] This heat treatment also inactivates the Penicillium roqueforti, inhibiting further fermentation.[12]
Penicillium roqueforti, responsible for the greenish blue moldy aspect of blue cheese, produces several mycotoxins. While mycotoxins like roquefortine, isofumigaclavine A, mycophenolic acid and ferrichrome are present at low levels, penicillic acid and PR toxin are unstable in the cheese. Because of the instability of PR toxin and lack of optimal environmental conditions (temperature, aeration) for the production of PR toxin and roquefortine, health hazards due to Penicillium roqueforti metabolites are considerably reduced.[19] Additionally, mycotoxin contamination occurs at low levels and large quantities of cheese are rarely consumed, suggesting that hazard to human health is unlikely. [20]
Penicillium roqueforti and Penicillium glaucum are both molds that require the presence of oxygen to grow. Therefore, initial fermentation of the cheese is done by lactic acid bacteria. The lactic acid bacteria, however, are killed by the low pH and the secondary fermenters, Penicillium roqueforti, take over and break the lactic acid down, maintaining a pH in the aged cheese above 6.0.[22] As the pH rises again from the loss of lactic acid, the enzymes in the molds responsible for lipolysis and proteolysis are more active and can continue to ferment the cheese because they are optimal at a pH of 6.0.[23]
Penicillium roqueforti creates the characteristic blue veins in blue cheese after the aged curds have been pierced, forming air tunnels in the cheese. When given oxygen, the mold is able to grow along the surface of the curd-air interface.[24] The veins along the blue cheese are also responsible for the aroma of blue cheese itself. In fact, one type of bacteria in blue cheese, Brevibacterium linens, is the same bacteria responsible for foot and body odor. B. linens was previously thought to give cheeses their distinct orangish pigmentation, but studies show this not to be the case and blue cheese is an example of the lack of that orange pigmentation.[25] In pressing the cheese, the curds are not tightly packed in order to allow for air gaps between them. After piercing, the mold can also grow in between the curds.
A portion of the distinct flavour comes from lipolysis (breakdown of fat). The metabolism of the blue mold further breaks down fatty acids to form ketones to give blue cheese a richer flavour and aroma.[26]
In the European Union, many blue cheeses, such as Cabrales, Danablu, Gorgonzola, Roquefort and Blue Stilton, carry a protected designation of origin, meaning they can bear the name only if they have been made in a particular region. Similarly, individual countries have protections of their own such as France's Appellation d'Origine ContrÃlÃe and Italy's Denominazione di Origine Protetta. Blue cheeses with no protected origin name are designated simply "blue cheese".
Under the regulation of the Canadian Food Inspection Agency, it requires manufacturers to produce blue cheese with a maximum of 47 percent moisture, and minimum of 27 percent milk fat.[27] Salt is allowed to be used as a preservative; however, the amount of the salt or combination of salts shall not exceed 200 parts per million of the milk and milk products used to make the cheese.[27] Other than that the regulation of Canadian Food Inspection Agency does not limit producers to use bacterial cultures to aid further ripening and flavoring preparations other than cheese flavoring.[27]
Gorgonzola, Stilton, and Roquefort are considered to be favored blue cheeses in many countries.[28] These cheeses all have a protected designation of origin in which they may only be called their respective name if produced a certain way in a certain location.
Gorgonzola blue cheese takes its name from the village of Gorgonzola in Italy where it was first made.[28] Belonging to the family of Stracchino cheeses, Gorgonzola is a whole milk, white, and "uncooked" cheese.[28] This blue cheese is inoculated with Penicillium glaucum which, during ripening, produces the characteristic of blue-green veins.[28] The odor of Gorgonzola varies between natural and creamy Gorgonzola cheese.[29][30] 63 components in natural Gorgonzola cheese and 52 components in creamy Gorgonzola cheese contribute to odor with 2-nonanone, 1-octen-3-ol, 2-heptanol, ethyl hexanoate, methylanisole and 2-heptanone being the prominent compounds for odor in both cheeses.[29][31]
Stilton blue cheese was first sold in the village of Stilton in England but there is little evidence it was ever made there. Different from Stichelton, which is made from raw milk, Stilton cheese is made from pasteurized milk.[28] In addition to being inoculated with Penicillium roqueforti to give it the blue vein characteristic, research has shown that other microbiota which are relatives of Lactococcus lactis, Enterococcus faecalis, Lactobacillus plantarum, Lactobacillus curvatus, Leuconostoc mesenteroides, Staphylococcus equorum, and Staphylococcus sp. can also be found in Stilton cheese.[32] Some important microbiota contribute to the aromatic profile such as those of the Lactobacillus genus due to their production of volatile compounds.[33] During ripening, free fatty acids increase in amount which contribute to the characteristic flavor of blue cheeses due to fat breakdown by Penicillium roqueforti.[34]
Roquefort blue cheese originates from the village of Roquefort-sur-Soulzon, France.[28] Its flavors come from the use of unpasteurized sheep's milk, inoculation with Penicillium roqueforti, and the special conditions of the natural caves of Roquefort-sur-Soulzon in which they are ripened.[28] Penicillium roqueforti is the cause of the blue veins in Roquefort cheese. In addition to Penicillium roqueforti, various yeasts are present, namely Debaryomyces hansenii and its non-sporulating form Candida famata, and Kluyveromyces lactis and its non-sporulating form Candida sphaerica.[35] Similarly to other kinds of blue cheeses, Roquefort's flavor and odor can be attributed to the particular mixture of methyl ketones such as 2-heptanone, 2-pentanone, and 2-nonanone.[16]
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