Hydrothermal-microwave processing for starch extraction from Mexican avocado seeds: operational conditions and characterization

Rafael G. Araújo, Rosa M. Rodríguez-Jasso, Héctor A. Ruiz, Mayela Govea-Salas, Walfred Rosas-Flores, Miguel Angel Aguilar-González, Manuela E. Pintado, Claudia Lopez-Badillo, Cynthia Luevanos, Cristobal Noe Aguilar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
34 Downloads

Abstract

Avocado seeds are an agroindustrial residue widely produced in Mexico that are causing various environmental problems due to their accumulation. The evaluation of avocado residues to recover biopolymers by microwave-assisted extraction (MAE) and the characterization of avocado starch properties were studied in the present work. A central-composite design was used to optimize the MAE process. Moreover, a comparison was performed between MAE non-isothermal mode (NO-ISO) and conventional extraction. Starch optimization by MAE was obtained at 161.09 °C for 56.23 min with an extraction yield of 49.52% ± 0.69%, while with NO-ISO at 161 °C was obtained 45.75% ± 2.18%. Conventional extraction was 39.04% ± 2.22%. Compared with conventional starch, MAE starch showed similar proprieties and molecular spectra. In contrast, MAE starch showed high solubility, low water absorption capacity, a non-granular structure with small particle size (<2 μm) and polydispersity of fragments at dierent sizes of polymers. Therefore, MAE is a viable technology to extract the starch, and avocado seed can be considered an excellent starch source for the development of novel functional foods, contributing to promoting sustainability across the food chain.
Original languageEnglish
Article number759
Number of pages17
JournalProcesses
Volume8
Issue number7
DOIs
Publication statusPublished - Jul 2020

Keywords

  • Avocado seeds
  • Microwave-assisted extraction
  • Starch source

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