HPLC injection mode for the Vitamin B group analysis

Hi all, 

Currently, we've followed the method published by Agilent (Analysis of water-soluble vitamins from multivitamin tablets for nutrition labeling) in  2011 to set up our equipment for vitamin B analysis. But we just realize that the method doesn't include the part of injection mode. I just wonder can anyone else suggest any published papers that included this part?  So we can use that as a reference! Thanks! 

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