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High-pressure processing of Manuka honey: improvement of antioxidant activity, preservation of colour and flow behaviour

Mohd Fauzi, Noor Akhmazillah and Farid, Mohammed Mehdi and Silva, F.V.M. (2013) High-pressure processing of Manuka honey: improvement of antioxidant activity, preservation of colour and flow behaviour. Food and Bioprocess Technology, 7 (8). 2299-2307 . ISSN 1935-5149

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Abstract

Manuka honey in New Zealand is known for its superior antimicrobial and antioxidant properties. However, these valuable properties are known to be compromised when raw honey goes through conventional thermal processing, thus reducing its final quality. As such, this present work is undertaken to assess the effect of high-pressure processing on quality of honey, namely, the antioxidant activity, colour and viscosity. The honey was subjected to different pressures (200–600 MPa) at ambient temperatures (25 to 33 °C) and combined with moderate temperatures (53 to 74 °C) for holding times (10 to 30 min). Thermal processing (49 to 70 °C) was also carried out for comparison purpose. In the absence of heat, the antioxidant activity of high-pressure processing (HPP)-treated samples (600 MPa, 10 min) was found to increase by about 30 % with no colour changes detected. The shear-thinning behaviour of the honey was also retained after HPP at ambient temperature, whereas for combined HPP–thermal treatment, no added benefit in antioxidant activity was observed particularly at higher temperature. Colour was significantly degraded when processed for ≥15 min at 70 °C and the flow behaviour was brought about from shear thinning to Newtonian. Thus, it can be concluded that the quality of honey can be enhanced by using high-pressure processing at ambient temperature.

Item Type: Article
Uncontrolled Keywords: high-pressure processing; honey; antioxidant activity; colour; viscosity
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering Technology > Department of Chemical Engineering Technology
Depositing User: Normajihan Abd. Rahman
Date Deposited: 04 Jan 2015 08:54
Last Modified: 04 Jan 2015 08:54
URI: http://eprints.uthm.edu.my/id/eprint/6185
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