Effects of radio frequency and high pressure steam sterilisation on the colour and flavour of prepared Nostoc sphaeroides

Xu, J, An, Y, Zhang, M, Roknul, A and Adhikari, B 2018, 'Effects of radio frequency and high pressure steam sterilisation on the colour and flavour of prepared Nostoc sphaeroides', Journal of the Science of Food and Agriculture, vol. 98, no. 5, pp. 1719-1724.


Document type: Journal Article
Collection: Journal Articles

Title Effects of radio frequency and high pressure steam sterilisation on the colour and flavour of prepared Nostoc sphaeroides
Author(s) Xu, J
An, Y
Zhang, M
Roknul, A
Adhikari, B
Year 2018
Journal name Journal of the Science of Food and Agriculture
Volume number 98
Issue number 5
Start page 1719
End page 1724
Total pages 6
Publisher John Wiley and Sons
Abstract BACKGROUND: Nostoc sphaeroides has been used as a highly effective herbal medicine and dietary supplement for thousands of years. The desired dark green colour of fresh N. sphaeroides is converted into an undesirable dark brown during conventional high pressure (HP) steam sterilisation. Radio frequency (RF) sterilisation technology was used in this study to determine its effectiveness in sterilising N. sphaeroides and to achieve better preservation of natural colour and desirable flavour. Sterilisation was carried out using a 6 kW, 27 MHz RF instrument for 10, 20 and 30 min. The degree of microbial kill and the effects of RF sterilisation on colour and flavour were determined and compared with those obtained from HP steam (121 °C, 30 min) sterilisation. RESULTS: The effects of RF sterilisation on colour and flavour (measured using electronic nose) parameters were significantly lower than that in HP steam sterilisation. The RF sterilisation carried out for 20 min achieved logarithmic reduction of bacterial population and met China's national standard while preserving the colour and flavour better. CONCLUSION: Results of the present study indicated that application of RF sterilisation would improve the quality of sterilised N. sphaeroides and broaden its application in the food and health food industries.
Subject Engineering not elsewhere classified
Agricultural and Veterinary Sciences not elsewhere classified
Keyword(s) colour parameters
electronic nose
flavour
microbial kill
Nostoc sphaeroides
RF sterilisation
DOI - identifier 10.1002/jsfa.8644
Copyright notice © 2017 Society of Chemical Industry
ISSN 0022-5142
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