the advantages of this method are : ( a ) the addition of a small amount of polyethylene glycol ( peg ) or polyethylene oxide ( peo ) to a complex coacervation system ( e.g. , gelatin-acacia ) allows microencapsulation to occur over an expanded ph region ( ph 2-9 in gelatin-acacia ) .
C0032483
polyethylene glycol
C0032478
polyethylene oxide