Abstract
The effect of temperature on the main components and antioxidant activities of abalone viscera subcritical water extract (AVSWE) was investigated. With the increase in temperature from 110 °C to 230 °C, the protein content in AVSWE increased from 57.4% to 68.5%, while the carbohydrate content decreased from 17.9% to 0.8%. The highest percentage of 1000–5000 Da peptide fraction and total essential amino acid content was found in the AVSWE extracted at 170 °C. The transformation rate of arsenobetaine into dimethylarsinic acid in AVSWE increased dramatically with the increase subcritical water temperature from 170 °C to 200 °C. The results of DPPH and hydroxyl radical scavenging activity, reducing power and lipid peroxidation inhibition effect showed that AVSWE with the highest antioxidant activities was extracted at 170 °C. However, the subcritical water temperature for AVSWE extraction should not exceed 140 °C according to arsenic speciation.
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