Abstract
The rheological properties and the secondary structures of date palm pollen concentrates were investigated in the present study. The sonication pretreatment and the succinylation procedure were applied to the native protein, as physical and chemical modifications, respectively. Each modification affected differently the native concentrate. In fact, in the flow measurement, results, fitted with the power low model, showed that sonication increased the consistency coefficient and decreased the flow index implying a more shear-thinning character. However, for succinylation modification, an increase of the flow index and a decrease of the consistency coefficient were noticed which convert the protein concentrate to a less viscous and more Newtonian-like state. Sonication also enhanced the thixotropic behavior which was expressed by the increase of the hysteresis loop, whereas the succinylation suppressed it, which was deduced from the disappearance of the loop area. The frequency sweep analysis proved that the sonicated concentrate was characterized by a strong gel structure while the succinylated protein had a viscoelastic liquid character. Only the native and the succinylated concentrates gelified, in the temperature sweep test, at 53.1 and 54.4 °C, respectively. All discerned differences were attributed to the secondary structure content. The findings revealed that the sonicated protein had a high β sheet content, leading to greater thermal stability which proved that a higher temperature is required to ensure the gelation of the protein. However, native and succinylated concentrates were found to have an equilibrium between α helix and β sheet which made it possible to form a stable gel at a lower temperature. The present study concluded that the modifications had a great impact on the rheological properties which was strongly attributed to the submitted structural changes.
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References
Avanza M, Puppo M, Añón M (2005) Rheological characterization of amaranth protein gels. Food Hydrocol 19(5):889–898
Baier SK, McClements DJ (2005) Influence of cosolvent systems on the gelation mechanism of globular protein: thermodynamic, kinetic, and structural aspects of globular protein gelation. Comprehen Rev Food Sci Food Safety 4(3):43–54
Busch VM, Delgado JF, Santagapita PR, Wagner JR, Buera MDP (2018) Rheological characterization of vinal gum, a galactomannan extracted from Prosopis ruscifolia seeds. Food Hydrocol 74:333–341
Fitzsimons SM, Mulvihill DM, Morris ER (2007) Denaturation and aggregation processes in thermal gelation of whey proteins resolved by differential scanning calorimetry. Food Hydrocol 21(4):638–644
Foegeding EA (2006) Food biophysics of protein gels: a challenge of nano and macroscopic proportions. Food Biophys 1(1):41–50
Gossett PW, Rizvi S, Baker R (1983) Selected rheological properties of pH-adjusted or succinylated egg albumen. J Food Sci 48(5):1395–1399
Hu H, Wu J, Li-Chan EC, Zhu L, Zhang F, Xu X, Fan G, Wang L, Huang X, Pan S (2013) Effects of ultrasound on structural and physical properties of soy protein isolate (SPI) dispersions. Food Hydrocol 30(2):647–655
Jambrak AR, Lelas V, Mason TJ, Krešić G, Badanjak M (2009) Physical properties of ultrasound treated soy proteins. J Food Eng 93(4):386–393
Kaspchak E, de Oliveira MAS, Simas FF, Franco CRC, Silveira JLM, Mafra MR, Igarashi-Mafra L (2017) Determination of heat-set gelation capacity of a quinoa protein isolate (Chenopodium quinoa) by dynamic oscillatory rheological analysis. Food Chem 232:263–271
Kinsella JE (1979) Functional properties of soy proteins. J Am Oil Chem Soc 56((3Part1)):242–258
Kong J, Yu S (2007) Fourier transform infrared spectroscopic analysis of protein secondary structures. Acta Biochim Biophys Sin 39(8):549–559
Lapasin R (2012) Rheology of industrial polysaccharides: theory and applications: Springer Science & Business Media
Lefevre T, Subirade M (2000) Molecular differences in the formation and structure of fine-stranded and particulate β-lactoglobulin gels. Biopol Orig Res Biomol 54(7):578–586
Mirmoghtadaie L, Kadivar M, Shahedi M (2009) Effects of succinylation and deamidation on functional properties of oat protein isolate. Food Chem 114(1):127–131
Pana ME (2012) Impact des traitements thermiques sur la structure des protéines de lentilles et leur digestibilité. Thesis. Laval university
Sebii H, Karra S, Bchir B, Ghribi AM, Danthine S, Blecker C, Attia H, Besbes S (2019) Effect of sonication pretreatment on physico-chemical, surface and thermal properties of date palm pollen protein concentrate. LWT 106:128–136
Sebii H, Karr S, Bchir B, Nhouchi Z, Ghribi AM, Karoui R, Blecker C, Besbes S (2020) Effect of succinylation on the secondary structures, surface, and thermal properties of date palm pollen protein concentrate. J Food Sci Technol 1–9
Shevkani K, Singh N, Kaur A, Rana JC (2015) Structural and functional characterization of kidney bean and field pea protein isolates: a comparative study. Food Hydrocol 43:679–689
Shilpashree B, Arora S, Chawla P, Tomar S (2015) Effect of succinylation on physicochemical and functional properties of milk protein concentrate. Food Res Int 72:223–230
Stading M, Hermansson A-M (1990) Viscoelastic behaviour of β-lactoglobulin gel structures. Food Hydrocol 4(2):121–135
Su Y, Dong Y, Niu F, Wang C, Liu Y, Yang Y (2015) Study on the gel properties and secondary structure of soybean protein isolate/egg white composite gels. Eur Food Res Technol 240(2):367–378
Tarone AG, Fasolin LH, de Assis Perrechil F, Hubinger MD, da Cunha RL (2013) Influence of drying conditions on the gelling properties of the 7S and 11S soy protein fractions. Food Bioprod Process 91(2):111–120
Totosaus A, Montejano JG, Salazar JA, Guerrero I (2002) A review of physical and chemical protein-gel induction. Int J Food Sci Technol 37(6):589–601
Wang K-Q, Luo S-Z, Zhong X-Y, Cai J, Jiang S-T, Zheng Z (2017) Changes in chemical interactions and protein conformation during heat-induced wheat gluten gel formation. Food Chem 214:393–399
Wei Y, Lin Y, Xie R, Xu Y, Yao J, Zhang J (2015) The flow behavior, thixotropy and dynamical viscoelasticity of fenugreek gum. J Food Eng 166:21–28
Acknowledgements
The authors would like to express their gratitude to the Laboratory of Food Science and Formulation Agro-Bio Tech Agro-Bio Tech, Laboratory of Food Science and Formulation, University of Liège, Belgium, for their collaboration in this research. They extend their gratitude to Ms Leila Mahfoudhi, Professor of English in the Sfax Faculty of Science, for editing the language of the manuscript.
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This research work was funded by the Ministry of Higher Education and Scientific Research, Tunisia, and Wallonie Bruxelles International (WBI).
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Sebii, H., Karra, S., Blecker, C. et al. Effect of sonication and succinylation on rheological properties and secondary structures of date palm pollen protein concentrate. Rheol Acta 60, 543–551 (2021). https://doi.org/10.1007/s00397-021-01291-3
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DOI: https://doi.org/10.1007/s00397-021-01291-3