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Wang S, Qu D, Zhao G, Yang L, Zhu L, Song H, Liu H. Characterization of the structure and properties of the isolating interfacial layer of oil-water emulsions stabilized by soy hull polysaccharide: Effect of pH changes. Food Chem 2021; 370:131029. [PMID: 34500292 DOI: 10.1016/j.foodchem.2021.131029] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 08/23/2021] [Accepted: 08/29/2021] [Indexed: 01/08/2023]
Abstract
The effect of pH on the microstructure and properties of the soy hull polysaccharide interfacial layer was determined. The particle size at pH 2.0 was the largest (36.7 μm), whereas the absolute ζ-potential was the smallest. The protein content was the lowest at pH 2.0 and 9.0 and peaked around pH 4.0-5.0 (77.7%). The ordered secondary protein structure content under low pH conditions was greater than that under high pH conditions and the stability of the interfacial layer was higher at high pH, whereas the emulsion viscosity decreased by two orders of magnitude between pH 2.0 and 9.0. It appears that low pH reduced the thermal stability and increased the apparent viscosity of the emulsion by increasing the structural order of the protein in the interfacial layer. These findings lay the foundation for future work to reveal the key components and characteristic structures of soy hull polysaccharide that affect interfacial stability.
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Affiliation(s)
- Shengnan Wang
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China; Liaoning Province Grain and Cereal Food Bio-efficient Transformation Engineering Research Center, Bohai University, Jinzhou 121013, China
| | - Danni Qu
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China
| | - Guilan Zhao
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China
| | - Lina Yang
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China; Liaoning Province Grain and Cereal Food Bio-efficient Transformation Engineering Research Center, Bohai University, Jinzhou 121013, China
| | - Lijie Zhu
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China; Liaoning Province Grain and Cereal Food Bio-efficient Transformation Engineering Research Center, Bohai University, Jinzhou 121013, China
| | - Hong Song
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China; Liaoning Province Grain and Cereal Food Bio-efficient Transformation Engineering Research Center, Bohai University, Jinzhou 121013, China
| | - He Liu
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China; Liaoning Province Grain and Cereal Food Bio-efficient Transformation Engineering Research Center, Bohai University, Jinzhou 121013, China.
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Huang G, Liu J, Jin W, Wei Z, Ho CT, Zhao S, Zhang K, Huang Q. Formation of Nanocomplexes between Carboxymethyl Inulin and Bovine Serum Albumin via pH-Induced Electrostatic Interaction. Molecules 2019; 24:E3056. [PMID: 31443488 PMCID: PMC6749403 DOI: 10.3390/molecules24173056] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 08/18/2019] [Accepted: 08/21/2019] [Indexed: 01/09/2023] Open
Abstract
As a functional polysaccharide, inulin was carboxymethylated and it formed nanocomplexes with bovine serum albumin (BSA). The success of obtaining carboxymethyl inulin (CMI) was confirmed by a combination of Fourier transform Infrared (FT-IR), Raman spectroscopy, gel permeation chromatography (GPC), and titration. The effects of pH and ionic strength on the formation of CMI/BSA nanocomplexes were investigated. Our results showed that the formation of complex coacervate (pHφ1) and dissolution of CMI/BSA insoluble complexes (pHφ2) appeared in pH near 4.85 and 2.00 respectively. FT-IR and Raman data confirmed the existence of electrostatic interaction and hydrogen bonding between CMI and BSA. The isothermal titration calorimetry (ITC) results suggested that the process of complex formation was spontaneous and exothermic. The complexation was dominated by enthalpy changes (∆Η < 0, ∆S < 0) at pH 4.00, while it was contributed by enthalpic and entropic changes (∆Η < 0, ∆S > 0) at pH 2.60. Irregularly shaped insoluble complexes and globular soluble nanocomplexes (about 150 nm) were observed in CMI/BSA complexes at pH 4.00 and 2.60 while using optical microscopy and atomic force microscopy, respectively. The sodium chloride suppression effect on CMI/BSA complexes was confirmed by the decrease of incipient pH for soluble complex formation (or pHc) and pHφ1 under different sodium chloride concentrations. This research presents a new functional system with the potential for delivering bioactive food ingredients.
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Affiliation(s)
- Guiying Huang
- Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, China
| | - Jun Liu
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Weiping Jin
- College of Food Science and Engineering, Wuhan Polytechnic University, 68 Xuefu South Road, Wuhan 430023, Hubei, China
| | - Zihao Wei
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA
| | - Chi-Tang Ho
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA
| | - Suqing Zhao
- Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
| | - Kun Zhang
- Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
- College of Chemistry and Environmental Engineering, Wuyi University, Jiangmen 529020, Guangdong, China.
| | - Qingrong Huang
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901, USA.
- College of Chemistry and Environmental Engineering, Wuyi University, Jiangmen 529020, Guangdong, China.
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