Abstract
This study aims at providing knowledge on the ability of food oil-in-water emulsions at sustaining extremely high temperature such that they can be used for sterilized food. Emulsions were prepared using biopolymer chitosan as Pickering emulsifier and ultrasonication for size reduction of oil droplets. Zeta potential, physical stability, and particle size distribution of emulsions were measured. The prepared emulsions were subjected to heat treatment at 121 °C using an aluminum cell-oil bath arrangement for varying time periods (30 and 60 min) in sealed polymeric pouches. After heat treatment, emulsions were stored for 2 weeks under accelerated storage condition of 37 °C and their physical stability, degradation of β-carotene, and loss of pigmentation as changes in L*, a*, and b* were analyzed to establish the stability of emulsions post-thermal stress. It was observed that the encapsulation matrix composed of self-aggregated chitosan could withstand heat processing treatment up to 1 h at 121 °C. The percent retention of β-carotene varied from 82 to 45% depending on the length of exposure at 121 °C and perceptible change in color as ΔE greater than 2 was recoded for 30 min and 60 min treatments. During subsequent storage at 37 °C, the measured content of β-carotene and color parameters remained mostly constant. These emulsions could be incorporated into sterilized food which have a long shelf life thereby extending the availability of encapsulated bioactive during storage after thermal processing.
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Data Availability Statement
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank technical assistance extended by Dr. Saleh Al-Ghamdi, Dr. Dan Mullendore and Dr. Ashutos Parhi. The authors are grateful to Dr. Hanu Pappu and Dr. Girish Ganjyal for equipment usage.
Funding
This project was funded by the United Stated Department of Agriculture: National Institute of Food and Agriculture grants #2016–67017-24597 and #2016–68003-24840.
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Shyam S Sablani: conceptualization, methodology, supervision, writing—reviewing, funding acquisition, project administration. Sivapratha Sivabalan: conceptualization, methodology, visualization, investigation, data curation and analysis, writing—original draft preparation and editing.
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Sivabalan, S., Sablani, S. Design of β-Carotene Encapsulated Emulsions for Thermal Processing and Storage. Food Bioprocess Technol 15, 338–351 (2022). https://doi.org/10.1007/s11947-021-02754-4
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DOI: https://doi.org/10.1007/s11947-021-02754-4