University:
Swansea University
Course:
PM134 | Microbiology
Academic year:

2023
Views:

412

Pages:

2
Author:

Amal J.

usedbiownverium of ethanol from dairy food milling washXetaborically engread L. lacts has and been b corn for industrialderived bacteriocins are suitable. as preservativeLAB such as nisin from L. lactis, pedioun from podiococcus strains,and onterocin from En. faccalis.Nirs is well Known for antibacterial effects against listenClostridium spores. H has also been approved as a foodadditive (E234) in the EU according to Directive 95/2/EC(EC, 1995).Nisin production in L. lactis has been enhanced and itsbactericidal effects increased through genetic engineering of theStrainNutracenticalslactic and bacteria can be used for the production ofnutraceuticals Such as polyots (eg: sugar alcohols ) andVitamins, Such as nboflavin and folateJ Signeficant overexpression of niboflavin has been achiedthrough genetic engineering of L. lautisL.10 increase folate levels metabolic engineering oflactis / Lb. gassori Lb. reutor has been performed. for the production of polyols, sobitd levels 0 were increasedby engineering Lb. casei and Lb. plantarumOn the other hand ,the use of ldh - deficient L. lacts increasedHs production of mannitol although due to the genetre engineeringapplied, this prevented its GRAS labeling.-Recombinant amylolytic and (herr)). - cellulolytic LAB have beenconstructed for hydrolysis for polysaccharides, which is otherwiseachieved by either physicochemical strategies or enzymatictreatments, both of which have the draw back of w productionof toxic compounds and high cost-Several successful constructions of recombinant amylolytic LABhaebeen reported such as Secretion of heterologous xx-amylase in Lb.carec, Lb. plantarum, and L. loutis. Enzymatic systems for lignacellularhydrolysis include heterologan (hemi-)cellularce expression, or otherenzyme expression (eg. endoglucanase exocularase)such systems have already been applied to Lb. plantarum,Lb. gassere, Lb. johnsonli and L latis.-Moreover, the production of other hydrolytic enzymes has also beenreported. B galactosidases and latases are important in theproduction of lactose-free dairy products and they have been