Effect of Relative Humidity on the Oxidative Stability of Microencapsulated Sea Buckthorn Seed Oil

Abstract

ABSTRA ABSTRA ABSTRA ABSTRA ABSTRACT CT CT CT CT: : : : : The effect of r The effect of r The effect of r The effect of r The effect of relativ elativ elativ elativ elative humidity (RH) (20 °C: RH 11%, 54%) on o e humidity (RH) (20 °C: RH 11%, 54%) on o e humidity (RH) (20 °C: RH 11%, 54%) on o e humidity (RH) (20 °C: RH 11%, 54%) on o e humidity (RH) (20 °C: RH 11%, 54%) on oxidativ xidativ xidativ xidativ xidative stability micr e stability micr e stability micr e stability micr e stability microencapsulated sea oencapsulated sea oencapsulated sea oencapsulated sea oencapsulated sea buckthorn seed oil was studied using bulk oil as a reference. Microcapsules were prepared by spray-drying using buckthorn seed oil was studied using bulk oil as a reference. Microcapsules were prepared by spray-drying using buckthorn seed oil was studied using bulk oil as a reference. Microcapsules were prepared by spray-drying using buckthorn seed oil was studied using bulk oil as a reference. Microcapsules were prepared by spray-drying using buckthorn seed oil was studied using bulk oil as a reference. Microcapsules were prepared by spray-drying using maltodextrin-gum arabic (MD/GA) and corn starch sodium octenyl succinate derivate (HiCap) as the wall materi-maltodextrin-gum arabic (MD/GA) and corn starch sodium octenyl succinate derivate (HiCap) as the wall materi-maltodextrin-gum arabic (MD/GA) and corn starch sodium octenyl succinate derivate (HiCap) as the wall materi-maltodextrin-gum arabic (MD/GA) and corn starch sodium octenyl succinate derivate (HiCap) as the wall materimaltodextrin-gum arabic (MD/GA) and corn starch sodium octenyl succinate derivate (HiCap) as the wall materials als als als als. . .. . The influence of the physical state of the wall mater The influence of the physical state of the wall mater The influence of the physical state of the wall mater The influence of the physical state of the wall mater The influence of the physical state of the wall material was also ev ial was also ev ial was also ev ial was also ev ial was also evaluated. U aluated. U aluated. U aluated. U aluated. Under dr nder dr nder dr nder dr nder dry conditions y conditions y conditions y conditions y conditions, the micr , the micr , the micr , the micr , the microenoen-oen-oenoencapsulated oils were most stable, but the oxidation of the bulk oil was accelerated. At 20 °C and at RH 11%, the capsulated oils were most stable, but the oxidation of the bulk oil was accelerated. At 20 °C and at RH 11%, the capsulated oils were most stable, but the oxidation of the bulk oil was accelerated. At 20 °C and at RH 11%, the capsulated oils were most stable, but the oxidation of the bulk oil was accelerated. At 20 °C and at RH 11%, the capsulated oils were most stable, but the oxidation of the bulk oil was accelerated. At 20 °C and at RH 11%, the peroxide value of the bulk oil exceeded 20 meq/kg within 1 wk. Microencapsulation prolonged the shelf-life of the oil peroxide value of the bulk oil exceeded 20 meq/kg within 1 wk. Microencapsulation pro...

Improving Product Quality with Entrapped Stable Emulsions: From Theory to Industrial Application

“…At both very low and high water activities, lipid oxidation rates are suggested to be appreciably higher than at intermediate water activities [89][90][91][92]. In all cases, complicated mechanisms related to metal catalyst activity, mobility to the oil-water interface and availability of active sites that suggest how water plays a critical role in oxidative stability are discussed [85]. Since there appears to be an optimum water content there must exist both anti-oxidative and pro-oxidative effects of water that are dependent on matrix structure, trace components such as metal ions, and interfacial properties [93][94][95][96].…”

“…Unfortunately, a study on oxidative stability of entrapped oils [85] did not support use of these accelerated conditions as predictive tools because the behavior differed too much from that at 20 °C. Above Tg of the encapsulate, moisture sorption may release oil from the matrix and hence accelerate lipid oxidation [23].…”

“…Water and temperature are two such key factors. At the glass transition temperature, the matrix is transformed into the rubbery state whereby the increased diffusive mobility contributes to a greater oxidation potential [85]. Consequently, temperature control during the manufacturing process and subsequent storage is imperative.…”

“…Size and distribution measurements and subsequent comparison with measurements before entrapment indicates whether significant coalescence or other forms of destabilization has occurred [85]. The free oil present would be from (i) leakage from the vesicles; (ii) their disruption from processing; or (iii) barrier breakdown during storage.…”

“…Glass transition temperature: In many situations the rate of oxygen permeation in the matrix is believed to be the rate determining step in oxidative degradation [85]. The glassy state (involving less free volume in a matrix compared with a rubbery state) is more effective in retarding the diffusion of small molecules and thus, the oxidation of lipids [86,87].…”