Toward the design of insect-based meat analogue: The role of calcium and temperature in coagulation behavior of Alphitobius diaperinus proteins

D. Azzollini*, T. Wibisaphira, C.M.M. Lakemond, V. Fogliano

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

This study focused on the coagulation behavior of protein from larvae of Alphitobius diaperinus. The effect of incremental CaCl2 concentration (10, 15, 20 and 20 mmol/L) and temperature (90, 100 °C) on physical-chemical properties of insect coagula was investigated. A yield between 76 and 83 g of coagulum was obtained from 100 g of fresh larvae, decreasing with higher temperature and CaCl2. Protein-protein interactions and microstructure of coagula were analyzed respectively by means of protein solubility, SDS-PAGE and SEM. When higher temperature was applied, hydrophobic interactions and disulphide bonds increased due to a larger degree of protein denaturation, thereby contributing to the formation of large protein aggregates. Thus, significant increase in hardness of the coagula was observed, with specimens at 20 mmol/L CaCl2 being more than twice harder at 100 °C than at 90 °C. Moreover, proteins homologous to actin and tropomyosin contributed to the coagulum structure by hydrophobic interactions, whereas hemolymph proteins formed disulphide bonds. Increasing concentration of CaCl2 from 10 to 20 mmol/L, at 100 °C, displayed a smoother network that increased coagula hardness from 1200 to 2900 g respectively. Results of this study provide important information for the product development in relation to insect protein-based meat analogues.

Original languageEnglish
Pages (from-to)75-82
JournalLWT
Volume100
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • Edible insects
  • Lesser mealworm
  • Meat analogue
  • Protein coagulation

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