Microencapsulation and oxidative stability of spray-dried fish oil emulsions.
Emulsions of menhaden oil and sodium caseinate (NaCas) incorporating carbohydrates of varying dextrose equivalence (DE) were spray-dried to yield encapsulated fish oil powders. The effects of carbohydrate DE (5.5-38), core/wall ratio and NaCas/carbohydrate ratio on microencapsulation efficiency (ME) and oxidative stability of spray-dried emulsions were examined. The effect of alpha-tocopherol or Trolox C addition on the oxidative stability of herring oil emulsions and powders was also determined. ME of fish oil powders was greater than 90% in most cases. Peroxide value (PV) of menhaden oil powders decreased on increasing the DE of carbohydrates. PV of menhaden oil powders increased as core/wall ratio increased from 0.33-1.0. NaCas/DE 28 ratio did not affect PV values of powders. The addition of alpha-tocopherol or Trolox C decreased PV throughout the storage period; this effect was most pronounced for alpha-tocopherol added to the oil at a concentration of 100 ppm. Addition of alpha-tocopherol delays the onset of oxidation in stored fish oil powders.
Hogan
S A
SA
Department of Food and Nutritional Sciences, University College Cork--National University of Ireland, Cork. s.hogan@ucc.ie
O'Riordan
E D
ED
O'Sullivan
M
M
D000975:Antioxidants / Q000494:pharmacology; D002241:Carbohydrates; D002364:Caseins / Q000494:pharmacology; D002839:Chromans / Q000494:pharmacology; D004339:Drug Compounding / Q000379:methods*; D004655:Emulsions; D005395:Fish Oils; D005947:Glucose / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D010316:Particle Size; D010545:Peroxides; D011208:Powders; D024502:alpha-Tocopherol / Q000494:pharmacology
D000975:Antioxidants; D002241:Carbohydrates; D002364:Caseins; D002839:Chromans; D004655:Emulsions; D005395:Fish Oils; D010545:Peroxides; D011208:Powders; C033266:Menhaden oil; D024502:alpha-Tocopherol; D005947:Glucose; C010643:6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid