title: Influence of environmental stresses on the stability of W/O/W emulsions containing enzymatically modified starch.
abstract: The present study was performed to investigate the stability of W/O/W emulsions containing 4-α-glucanotransferase (4αGTase)-treated starch against environmental stresses such as heating, shearing, and repeated freeze-thawing. W/O/W emulsions were subjected to thermal processing at different temperatures ranging from 30 to 90 °C for 30 min, constant shear for 0-7 min, and freeze-thaw cycling between -20 °C and 30 °C, respectively, and followed by encapsulation efficiency (EE) measurement. As for the case of thermal stress, it was clearly shown that addition of 4αGTase-treated starch in the internal aqueous phase of emulsions helped to maintain higher EE during thermal processing. However, at lower PGPR level (2%), the addition of 4αGTase-treated starch dramatically reduced EE at temperatures higher than 70 °C, which was probably related to the melting of 4αGTase-treated starch gel. The incorporation of 4αGTase-treated starch improved the stability of emulsions during shearing process, but could not prevent W/O/W emulsions from creaming and destabilizing during freeze-thaw cycling.
authors: Center for Food and Bioconvergence and Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Saehun
authors: S
authors: Mun
authors: Yongdoo
authors: Y
authors: Choi
authors: Kwan-Hwa
authors: KH
authors: Park
authors: Jae-Yong
authors: JY
authors: Shim
authors: Yong-Ro
authors: YR
authors: Kim
mesh_terms: D004355:Drug Stability; D004655:Emulsions; D004777:Environment; D005511:Food Handling; D005615:Freezing; D006004:Glycogen Debranching Enzyme System / Q000378:metabolism*; D009821:Oils / Q000737:chemistry*; D013213:Starch / Q000737:chemistry* / Q000378:metabolism*; D013314:Stress, Mechanical; D013696:Temperature; D013824:Thermus / Q000201:enzymology; D014867:Water / Q000737:chemistry*
chemical_list: D004655:Emulsions; D006004:Glycogen Debranching Enzyme System; D009821:Oils; D014867:Water; D013213:Starch; C020569:4 alpha-glucanotransferase