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Effect of high pressure homogenisation and heat treatment on physical properties and stability of almond and hazelnut milks

Bernat, N., Chafer, M., Rodríguez García, J., Chiralt, A. and Gonzalez-Martinez, C. (2015) Effect of high pressure homogenisation and heat treatment on physical properties and stability of almond and hazelnut milks. LWT-Food Science and Technology, 62 (1). pp. 488-496. ISSN 0023-6438

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To link to this item DOI: 10.1016/j.lwt.2014.10.045

Abstract/Summary

The effect of high pressure homogenisation (HPH) and heat treatments on physicochemical properties and physical stability of almond and hazelnut milks was studied. Vegetable milks were obtained and homogenised by applying 62, 103 and 172 MPa (MF1, MF2 and MF3, respectively). Untreated and MF3 samples were also submitted to two different heat treatments (85 °C/30 min (LH) or 121 °C/15 min (HH)). Physical and structural properties of the products were greatly affected by heat treatments and HPH. In almond milk, homogenised samples showed a significant reduction in particle size, which turned from bimodal and polydisperse to monodisperse distributions. Particle surface charge, clarity and Whiteness Index were increased and physical stability of samples was improved, without affecting either viscosity or protein stability. Hazelnut beverages showed similar trends, but HPH notably increased their viscosity while change their rheological behaviour, which suggested changes in protein conformation. HH treatments caused an increment of particle size due to the formation oil droplet-protein body clusters, associated with protein denaturation. Samples submitted to the combined treatment MF3 and LH showed the greatest stability.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:41219
Additional Information:Healthy Snacks: Recent Trends and Innovative Developments to Meet Current Needs
Publisher:Elsevier

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