Observation: cream cheese is great on bagels and vegetables and this is how cheese cake is made. It is made however from Lactic Acid Bacteria. Who knew so many things eaten by so many and daily stem from bacteria. Cream cheese is difficult to manufacture. Normally, protein molecules in milk have a negative surface charge, which keeps milk in a liquid state; the molecules act as surfactants, forming micelles around the particles of fat and keeping it in emulsion. Lactic acid bacteria are added to pasteurized and homogenized milk (wikipedia.org, 2011).
The lactic acid bacteria (LAB) comprise a clade of Gram-positive, low-GC, acid-tolerant, generally non-sporulating, non-respiring rod or cocci that are associated by their common metabolic and physiological characteristics. These bacteria, usually found in decomposing plants and lactic products, produce lactic acid as the major metabolic end-product of carbohydrate fermentation. This trait has, throughout history, linked LAB with food fermentations, as acidification inhibits the growth of spoilage agents. Proteinaceous bacteriocins are produced by several LAB strains and provide an additional hurdle for spoilage and pathogenic microorganisms. Furthermore, lactic acid and other metabolic products contribute to the organoleptic and textural profile of a food item. The industrial importance of the LAB is further evinced by their generally recognized as safe (GRAS) status, due to their ubiquitous appearance in food and their contribution to the healthy microflora of human mucosal surfaces. The genera that comprise the LAB are at its core Lactobacillus, Leuconostoc, Pediococcus, Lactococcus, and Streptococcus as well as the more peripheral Aerococcus, Carnobacterium, Enterococcus, Oenococcus, Sporolactobacillus, Tetragenococcus, Vagococcus, and Weisella; these belong to the order Lactobacillales (wikipedia.org, 2011).
Sources: http://en.wikipedia.org/wiki/Cream_cheese
http://en.wikipedia.org/wiki/Lactic_acid_bacteria
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