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Effects of roasting on kernel peroxide value, free fatty acid, fatty acid composition and crude protein content

journal contribution
posted on 24.07.2019, 00:00 authored by Shahla Hosseini BaiShahla Hosseini Bai, I Darby, T Nevenimo, G Hannet, D Hannet, M Poienou, E Grant, P Brooks, D Walton, B Randall
Roasting nuts may alter their chemical composition leading to changes in their health benefits. However, the presence of testa may alleviate the negative effects of thermal treatments. Hence, this study aimed to explore the effects of roasting on kernel chemical quality and colour development of Canarium indicum and examine to what extent testa would protect kernels against damage from roasting. Roasting decreased peroxide value but increased free fatty acid, probably due to increased cell destruction and lack of enzyme inactivation, respectively. Protein content of kernels significantly decreased after roasting compared to raw kernels. However, testa-on kernels contained significantly higher protein content compared to testa-off kernels. Whilst colour development and mottling were observed in temperatures beyond 120C, roasting did not alter fatty acid compositions of kernels. The mild roasting and presence of testa in kernels can be used to enhance health benefits of kernels.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

12

Issue

9

Start Page

1

End Page

14

Number of Pages

14

eISSN

1932-6203

Publisher

Public Library of Science, US

Additional Rights

CC BY 4.0

Peer Reviewed

Yes

Open Access

Yes

Acceptance Date

21/08/2017

External Author Affiliations

University of the Sunshine Coast; National Agricultural Research Institute, Islands Regional Centre, East New Britain Province, PNG

Era Eligible

Yes

Journal

PLoS ONE