Physicochemical Properties, Functionalities, and Antioxidant Activity of Protein Extracts from New Zealand Wild Sea Cucumbers (Australostichopus mollis)

Author:

Wen Yuan1ORCID,Dong Xuan1,Zamora Leonardo N.2ORCID,Jeffs Andrew G.34ORCID,Quek Siew Young15ORCID

Affiliation:

1. Food Science, School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand

2. Cawthron Institute, Private Bag 2, Nelson 7042, New Zealand

3. School of Biological Sciences, The University of Auckland, Auckland 1010, New Zealand

4. Institute of Marine Science, The University of Auckland, Auckland 1010, New Zealand

5. Riddet Institute, Centre of Research Excellence for Food Research, Palmerston North 4474, New Zealand

Abstract

This study investigated the physicochemical properties, functionalities, and antioxidant capacities of protein extracts from wild sea cucumber Australostichopus mollis collected from four distinct locations in New Zealand. Protein was extracted from sea cucumber body walls using trypsin enzymatic extraction, followed by cold acetone precipitation. The amino acid analysis revealed high glycine (189.08 mg/g), glutamic acid (119.45 mg/g), and aspartic acid (91.91 mg/g) concentrations in all samples. The essential amino acid indexes of the protein extracts (62.96, average) were higher than the WHO/FAO standard references, indicating the excellent protein quality of A. mollis. Furthermore, protein extracts from A. mollis demonstrated superior emulsifying activity (202.3–349.5 m2/g average) compared to commercial soy and whey protein isolates under all tested pH conditions, and enhanced foaming capacity (109.9–126.4%) and stability (52.7–72%) in neutral and acidic conditions. The extracts also exhibited good solubility, exceeding 70% across pH 3–11. Antioxidant capacities (ABTS and DPPH free radical scavenging activity and ferric reducing antioxidant power) were identified in A. mollis protein extracts for the first time, with clear variations observed among different locations. These findings elucidate the advantageous functional properties of protein extracts from wild New Zealand A. mollis and highlight their potential application as high-quality antioxidant food ingredients.

Funder

University of Auckland

RDA

Ministry of Business Innovation and Employment’s Strategic Science Investment Fund

Publisher

MDPI AG

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