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Highlights: [•] Guar gum hydrolysate (GGH) was esterified with n-octenyl succinic anhydride (OSA) and oleic acid. [•] Gum Arabic (GA) was also modified with OSA. [•] GGH, GA, GGH–OSA, GA–OSA and GGH-oleate were used for encapsulation of mint oil. [•] The retention of mint oil was GA–OSA>GGH–OSA~GA>GGH oleate. [•] No qualitative change in entrapped mint oil of microcapsules seen during storage. [Copyright &y& Elsevier]

Abstract: Spray dried microcapsules of mint oil were prepared using gum Arabic alone and its blends with radiation or enzymatically depolymerized guar gum as wall materials. Microcapsules were evaluated for retention of mint oil during 8-week storage during which qualitative changes in encapsulated mint oil was monitored using principal component analysis. The microcapsules with radiation depolymerized guar gum as wall material component could better retain major mint oil compounds such as menthol and isomenthol. The t 1/2 calculated for mint oil in microcapsules of gum Arabic, gum Arabic:radiation depolymerized guar gum (90:10), gum Arabic:enzyme depolymerized guar gum (90:10) was 25.66, 38.50, and 17.11 weeks, respectively. The results suggested a combination of radiation depolymerized guar gum and gum Arabic to show better retention of encapsulated flavour than gum Arabic alone as wall material. [Copyright &y& Elsevier]

Abstract: The present study was undertaken to introduce hydrophobicity in guar gum hydrolysate (GGH) with a view to develop a suitable alternative to gum Arabic (GA) as wall material for microencapsulation. This was done by esterification with n-octenyl succinic anhydride (OSA) and oleic acid. The study was carried out by optimizing three parameters in the esterification process, viz. concentration of the acid, temperature, and time of reaction by response surface methodology (RSM). The reaction was monitored in terms of degree of substitution (DS), and optimized for maximal DS. The maximum DS of GGH oleate, GGH-OSA, and GA-OSA was found to be 0.061, 0.072, and 0.070, respectively. These derivatives were evaluated for their ability to be used as wall materials in microencapsulation with respect to emulsion stability, viscosity and particle size. Our results indicate the wall materials to follow the order GA-OSA>GGH-OSA>GA>GGH-oleate. [Copyright &y& Elsevier]