As {TAIL ~ used herein “charge}” or “charged” refers to both negatively and positively charged metabolites or metabolites that can be induced to have {HEAD ~ charge separation} 
As { TAIL ~ used herein “ charge } ” or “ charged ” refers to both negatively and positively charged metabolites or metabolites that can be induced to have { HEAD ~ charge separation }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD