Physicochemical and structural properties of myofibrillar proteins isolated from pale, soft, exudative (PSE)-like chicken breast meat: Effects of pulsed electric field (PEF)

• Published in: Innovative food science & emerging technologies Vol. 59; p. 102277
• Main Authors: Dong, Ming, Xu, Yujuan, Zhang, Yumei, Han, Minyi, Wang, Peng, Xu, Xinglian, Zhou, Guanghong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2020
• Subjects: Myofibrillar protein; Physicochemical properties; PSE-like; Pulsed electric field; Structural properties; Myofibrillar protein; Pulsed electric field; PSE-like; Physicochemical properties; Structural properties
• ISSN: 1466-8564; 1878-5522
• DOI: 10.1016/j.ifset.2019.102277

The present study was performed to clarify the effects of pulsed electric field (PEF) on the physicochemical properties and conformations of myofibrillar proteins (MPs) extracted from pale, soft, exudative (PSE)-like chicken breast meat. Various PEF parameters, including the electric field intensity (0–28 kV/cm) and pulse frequency (0–1000 Hz), were varied. The results showed that as the PEF intensity increased, the solubility, surface hydrophobicity and sulfhydryl group content of the MPs were significantly improved. However, when the intensity exceeded 18 kV/cm, these properties declined, which was possibly due to protein aggregation caused by functional group interactions. Additionally, the PEF treatment altered the rheological properties of PSE-like MPs and induced the formation of low-elasticity MPs. However, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) demonstrated that the primary structure of the MPs was not altered after the PEF treatment. According to the circular dichroism (CD) spectroscopy results, the α-helix contents of the PEF-treated samples were increased but the β-turn and random coil contents were reduced. The occurrence of PSE-like chicken meat is one of the most serious quality issues worldwide and can decrease the consumer's purchasing desire and result in extensive economic losses for the poultry processing industry. MPs play a vital role in the qualitative characteristics of chicken products. As a potential novel processing technology, PEF has potential applications for improving the functionality of PSE-like chicken protein to expand its application in the food industry. •Moderate pulsed electric field (PEF) treatment significantly improved the solubility of myofibrillar proteins (MPs).•PEF processing enhanced the dynamic rheological properties of MPs.•SDS-PAGE demonstrated that protein aggregation increased with PEF treatment strength.•The surface hydrophobicity and sulfhydryl group content of MPs increased and then decreased with increasing PEF treatments.•CD spectra revealed that PEF treatment significantly changed the secondary structures of MPs.