Magnetotactic bacteriaMagnetospirillum magneticum containing chains of single domain magnetite particles (magnetosomes) having a mean particle size of from about 50 to about 70 nm have been colored by using erythrosine (FD&C Red #3). Ability of colored bacteria to form a stable dispersion in liquid molasses-based feeds and efficiency of their isolation from the feed by means of rare-earth magnet has been investigated. It was shown that erythrosine can be extracted from the collected bacteria by treatment with a hot aqueous solution of surfactant and its amount can be quantitatively determined by spectrophotometry. The possibility of using colored magnetotactic bacteria for evaluation of mixing efficiency in liquid feeds and premixes, and for qualitative and quantitative evaluation of presence of certain liquid microingredients, like enzymes, in liquid premixes and their distribution in the volume have been considered.

Magnetotactic bacteria<i> Magnetospirillum magneticum </i>colored with food grade dye FD&C Red #3 and their use for animal feed application

245th National Meeting (2013)

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Magnetotactic bacteria Magnetospirillum magneticum colored with food grade dye FD&C Red #3 and their use for animal feed application