The Power of Preservation Evaluated via Seward's Stomacher® Laboratory Blenders
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Assessing the Antimicrobial Effectiveness Without the Flavour of Vinegar and Red Wine
Worthing, UK – Seward Ltd’s Stomacher® laboratory paddle blender range has recently been used in a research project to investigate the effectiveness of fish and chip vinegar in preserving fresh catfish fillets using concentrations of vinegar that are effective, but do not over power the flavour1. Stomacher® is often used in preservative evaluations, as it is essential to use an effective benchmark blending process to detect the changes in microorganism recovery that indicate the efficacy of the preservative processes evaluated.
The antimicrobial activity of vinegar has long been known as a cost effective way of preserving foods of various kinds. The pickling of food adds a flavour dimension that is not only acceptable to the consumer but in the case of certain products, such as roll mop herring, is essential. However, for many food types, a flavour as strong as fish and chip vinegar is not desirable, despite the preservative effect it achieves.
The research project1 utilised Seward’s Stomacher® 400 Circulator to prepare the preserved samples and bacterial inocula, as well as to evaluate the recovery of the microorganisms after exposure of catfish to fish and chip vinegar in a simple challenge test.
The results showed that vinegar diluted to 0.5% acetic acid on catfish fillets would be suitable for prolonging shelf life and did not make the product unappealing to consumers. This presents a simple opportunity at an affordable price to reduce economic loss due to spoilage in food products, even where the flavour of vinegar is not desirable.
The Stomacher has also been used recently in the evaluation of red wine as a food preservative2. The exact mechanisms responsible for the antimicrobial activity of wine are not fully understood, but different components of wine have been proposed to contribute to its antimicrobial activity. Some authors give emphasis to the role of wine phenolics and others suggest the role of non-phenolic constituents of wine, such us organic acids, ethanol.
The aim of the study2 was to investigate the antibacterial efficiency of three phenolic compound combinations and total phenolic compounds at concentrations of 100-200mg/l of three Argentinean red wine varieties on E. coli and L. monocytogenes viability in a fish-meat model system, at 4 °C and 20 °C.
The results of this investigation suggest phenolic compounds found in wine could be used to extend the shelf life of fish. The results also indicate the use of rutin–quercetin in combination as a preservative during the transport and conservation of fish meat to the fish market. This is an effective antibacterial agent even when there is an interruption in the refrigeration of the product.
Links to both these studies are available at: http://seward.co.uk/resources/. For more information on Seward Ltd., please visit www.seward.co.uk. This release is also available online at: http://seward.co.uk/news-and-events/.
About Seward Limited - www.seward.co.uk
Seward manufactures the world leading range of Stomacher® paddle blenders and Stomacher® accessories used in sample preparation for microbiological analyses. The company has been manufacturing and developing the world renown and patented Stomacher® Lab Blender for 40 years. The original and still regarded as the best, over 8 million food samples a day are prepared on Stomacher® 400 paddle blender units around the world.
In addition to sample preparation for food safety analyses, within the bioscience market the new developments of the Stomacher® 80 and micro 80 are proving invaluable for safe and efficient sample processing. The Stomacher® 3500 has established itself as the instrument of choice for preparing samples for the new pathogen test protocols requiring jumbo size samples.
The company is based in Worthing, West Sussex, UK with subsidiaries in the USA and Singapore. All Seward machine products are manufactured within the UK and 1 of its 3 worldwide Stomacher® bag manufacturing operations is also UK-based. This ensures control of quality and price to deliver excellent value to global trading partners and laboratory customers.
Seward Limited continues to develop the product range, now with 3 patents to its credit. Stomacher® is the most highly referenced brand name in food safety and life science sample preparation in scientific publications. The company also assists customers with method development through reference searches and sample evaluations within its own development laboratory.
Seward contact details:
Europe, Middle East and ROW: +44 (0) 1903 823077; info@seward.co.uk
US & Canada: +1 772 621 8220; info@sewardusa.com
Asia and Pacific: +65 6519 2283; stevenlim@seward.co.uk
Product Enquiries
Seward Dan Crothers
t: +44 (0) 1903 236411
e: dancrothers@seward.co.uk
w: www.seward.co.uk
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