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Lactobacillus is a genus of Gram-positive, aerotolerant anaerobes or microaerophilic, rod-shaped, non-spore-forming bacteria. Until March 2020, the genus Lactobacillus comprised over 260 phylogenetically, ecologically, and metabolically diverse species; a taxonomic revision of the genus in 2020 assigned lactobacilli to 25 genera.
Lactobacillus delbrueckii subsp. bulgaricus is one of over 200 published species in the Lactobacillus genome complex (LGC) and is the main bacterium used for the production of yogurt. It also plays a crucial role in the ripening of some cheeses, as well as in other processes involving naturally fermented products. It is defined as homofermentive lactic acid bacteria due to lactic acid being the single end product of its carbohydrate digestion. It is also considered a probiotic.
Probiotics are live microorganisms promoted with claims that they provide health benefits when consumed, generally by improving or restoring the gut flora. Probiotics are considered generally safe to consume, but may cause bacteria-host interactions and unwanted side effects in rare cases. There is little evidence that probiotics bring the health benefits claimed for them.
Lactiplantibacillus plantarum is a widespread member of the genus Lactiplantibacillus and commonly found in many fermented food products as well as anaerobic plant matter. L. plantarum was first isolated from saliva, based on its ability to temporarily persist in plants, the insect intestine and in the intestinal tract of vertebrate animals, it was designated as nomadic organism. L. plantarum is Gram positive, bacilli shaped bacterium. L. plantarum cells are rods with rounded ends, straight, generally 0.9–1.2 μm wide and 3–8 μm long, occurring singly, in pairs or in short chains. L. plantarum has one of the largest genomes known among the lactic acid bacteria and is a very flexible and versatile species. It is estimated to grow between pH 3.4 and 8.8. Lactobacillus plantarum can grow in the temperature range 12 °C to 40 °C.
Leuconostoc is a genus of gram-positive bacteria, placed within the family of Leuconostocaceae. They are generally ovoid cocci often forming chains. Leuconostoc spp. are intrinsically resistant to vancomycin and are catalase-negative. All species within this genus are heterofermentative and are able to produce dextran from sucrose. They are generally slime-forming.
Lactobacillales are an order of gram-positive, low-GC, acid-tolerant, generally nonsporulating, nonrespiring, either rod-shaped (bacilli) or spherical (cocci) bacteria that share common metabolic and physiological characteristics. These bacteria, usually found in decomposing plants and milk products, produce lactic acid as the major metabolic end product of carbohydrate fermentation, giving them the common name lactic acid bacteria (LAB).
The Lactobacillaceae are a family of lactic acid bacteria. It is the only family in the Lactic acid bacteria which includes homofermentative and heterofermentative organisms; in the Lactobacillaceae, the pathway used for hexose fermentation is a genus-specific trait. Lactobacillaceae include the homofermentative lactobacilli Lactobacillus, Holzapfelia, Amylolactobacillus, Bombilactobacillus, Companilactobacillus, Lapidilactobacillus, Agrilactobacillus, Schleiferilactobacillus, Loigolactobacillus, Lacticaseibacillus, Latilactobacillus, Dellaglioa, Liquorilactobacillus, Ligilactobacillus and Lactiplantibacillus, the heterofermentative lactobacilli Furfurilactobacillus, Paucilactobacillus, Limosilactobacillus, Fructilactobacillus, Acetilactobacillus, Apilactobacillus, Levilactobacillus, Secundilactobacillus and Lentilactobacillus, which were previously classified in the genus Lactobacillus and the heterofermentative genera Convivina, Frucctobacillus, Leuconosto, Oenococcus and Weissella which were previously classified in the Leuconostocaceae.
Food microbiology is the study of the microorganisms that inhibit, create, or contaminate food. This includes the study of microorganisms causing food spoilage; pathogens that may cause disease ; microbes used to produce fermented foods such as cheese, yogurt, bread, beer, and wine; and microbes with other useful roles, such as producing probiotics.
Levilactobacillus brevis(previously Lactobacillus brevis) is a gram-positive, rod shaped species of lactic acid bacteria which is heterofermentative, creating CO2, lactic acid and acetic acid or ethanol during fermentation. L. brevis is the type species of the genus Levilactobacillus (previously L. brevis group), which comprises 24 species (http://www.lactobacillus.ualberta.ca/, http://www.lactobacillus.uantwerpen.be/). It can be found in many different environments, such as fermented foods, and as normal microbiota. L.brevis is found in food such as sauerkraut and pickles. It is also one of the most common causes of beer spoilage. Ingestion has been shown to improve human immune function, and it has been patented several times. Normal gut microbiotaL.brevis is found in human intestines, vagina and feces.
Weissella is a genus of gram-positive bacteria, placed within the family Leuconostocaceae, and formerly considered species of the Leuconostoc paramesenteroides group. The morphology of Weissella species varies from spherical or lenticular cells to irregular rods. Several strains of Weissella cibaria and Weissella confusa have shown the probiotic potential. In particular, the cell-free culture supernatant of Weissella confusa shows various beneficial characteristics such as antibacterial potential and anti-inflammatory efficiency. However, there are few strains of W. confusa was also found as an opportunistic bacteria. On the other, several studies have also done the safety assessment of the bacterial species, indicating it's probiotic potential. In addition, the Senate Commission on Food Safety has also validated the usage of W. confusa in the food.
Baek-kimchi (백김치) or white kimchi is a variety of kimchi made without the chili pepper powder commonly used for fermenting kimchi in Korean cuisine. Baek kimchi has a mild and clean flavor, which appeals to children and the elderly, to whom the regular kimchi might be too spicy. Baek kimchi consists of salted napa cabbage, radish, minari, spring onions, Korean pear, chestnuts, jujube, ginger, garlic, salt, sugar, and a little bit of chili threads as garnish.
Limosilactobacillus fermentum is a Gram-positive species in the heterofermentative genus Limosilactobacillus. It is associated with active dental caries lesions. It is also commonly found in fermenting animal and plant material including sourdough and cocoa fermentation. A few strains are considered probiotic or "friendly" bacteria in animals and at least one strain has been applied to treat urogenital infections in women. Some strains of lactobacilli formerly mistakenly classified as L. fermentum have since been reclassified as Limosilactobacillus reuteri. Commercialized strains of L. fermentum used as probiotics include PCC, ME-3 and CECT5716
Lactobacillus kimchii is a bacteriocin-producing lactic acid bacterium of the genus Lactobacillus. It is named for and found in the Korean fermented-vegetable food kimchi.
Bifidobacterium is a genus of gram-positive, nonmotile, often branched anaerobic bacteria. They are ubiquitous inhabitants of the gastrointestinal tract, vagina and mouth of mammals, including humans. Bifidobacteria are one of the major genera of bacteria that make up the gastrointestinal tract microbiota in mammals. Some bifidobacteria are used as probiotics.
Microbial food cultures are live bacteria, yeasts or moulds used in food production. Microbial food cultures carry out the fermentation process in foodstuffs. Used by humans since the Neolithic period fermentation helps to preserve perishable foods and to improve their nutritional and organoleptic qualities. As of 1995, fermented food represented between one quarter and one third of food consumed in Central Europe. More than 260 different species of microbial food culture are identified and described for their beneficial use in fermented food products globally, showing the importance of their use.
Weissella hellenica is a species of Gram-positive bacteria, placed within the family of Leuconostocaceae. It is frequently isolated from fermented sausage and flounder intestine, as well as Korean fermented pickle Kimchi and barrels used to make Japanese pickles. Some strains have been observed to be probiotic while some have not. Some strains produce bacteriocins named weissellicins which show antimicrobial activity against other bacteria.
Tetragenococcus muriaticus is a species of moderately halophilic lactic acid, histamine-producing bacteria. X-1 is the type strain of this species.
Lactobacillus acidipiscis is a species in the genus Lactobacillus. It is a homofermentative, rod-shaped lactic acid bacteria. Its type strain is FS60-1T.
Weissella thailandensis is a species of Gram-positive bacteria. It is a homofermentative, sphere-shaped lactic acid bacteria. Its type strain is FS61-1T. Its genome has been sequenced.
Weissella kimchii is a Gram-positive bacterium from the genus of Weissella which has been isolated from fermented cassava from Ketou in Benin.
References
- ↑ Choi, Hak-Jong; et al. (2002). "Weissella kimchii sp. nov., a novel lactic acid bacterium from kimchi". International Journal of Systematic and Evolutionary Microbiology . 52 (2): 507–511. doi: 10.1099/00207713-52-2-507 . PMID 11931163.
- ↑ Lee, Y. (2005). "Characterization of Weissella kimchii PL9023 as a potential probiotic for women". FEMS Microbiology Letters . 250 (1): 157–62. doi: 10.1016/j.femsle.2005.07.009 . PMID 16055277.
- ↑ Vieira-Dalodé, G.; et al. (August 2007). "Lactic acid bacteria and yeasts associated with gowé production from sorghum in Bénin". Journal of Applied Microbiology . 103 (2): 342–349. doi: 10.1111/j.1365-2672.2006.03252.x . PMID 17650194.
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