Either glycerol or lactic acid as plasticizer and, optionally, starch may also be blended with either the pectin or {HEAD ~ chitosan solutions} used for {TAIL ~ film preparation} 
used for
Either glycerol or lactic acid as plasticizer and , optionally , starch may also be blended with either the pectin or { HEAD ~ chitosan solutions } used for { TAIL ~ film preparation }
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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL