Abstract
Copper is a bivalent mineral and nutritionally necessary for mammals. It has been used as an animal feed additive or growth factor for animals. However, large amount of copper contained in animal manure by oversupplying of copper have a negative impact on the soil environment. Chelates of copper and amino acids have the advantages of being better absorbed into the intestines than copper ions and less sensitive to photodegradation than amino acids. Bacillus spp., a sporeforming probiotic, have stability against heat and low pH and are used as animal growth factor or feed additives. In this study, copper-L-lysine chelate was accumulated in Bacillus megaterium ATCC 10778 to use as mineral-containing probiotics or feed additives. The highest chelation rate of copper sulfate and L-lysine was 62.53% after 1:1 reaction of copper sulfate to Llysine for 25 minutes at 70℃. FB media was selected for bioaccumulation of copper-L-lysine chelate in flask culture. In the fermentor culture, 38,043 ppm of copper ion was accumulated in 6.50×108 CFU/mL of B. megaterium.
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