Prolonging Bakery Product Life – Essential Oils as Natural Preservatives

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Prolonging Bakery Product Life – Essential Oils as Natural Preservatives

The relevance of selecting the best in vitro test for antifungal screening of essential oils is sometimes overlooked. The minimal inhibitory concentration is usually determined using in vitro diffusion experiments. However, these data are mainly of interest when the essential oils are intended to be used as volatiles in the food packaging atmosphere. Data from both the in vitro diffusion and dilution experiments can be used for essential oil spray applications. The volatile behaviour of sprays, as well as the effect of touch, are essential considerations. If essential oils are to be used in a food matrix, such as bread dough, an in vitro dilution screening assay is required to predict antifungal activity when dispersed in a medium, ideally with adjusted pH, aw, media composition, and incubation temperature that are similar to the intended end product. By limiting the release of antifungal active volatile components, dispersing essential oils in a liquid or solid medium reduces the antifungal activity compared to diffusion experiments.

Fig.1. Use of spectroscopic techniques to monitor changes in food quality during application of natural preservatives (MDPI.com)

Modifications to bread manufacture and the use of crumb softeners, anti-staling chemicals, and humectants have been the mainstays of practical efforts to slow or stop the staling process. Fat, water, oxidants, enzymes, gluten, and flour all affect not only loaf volume and crumb structure, but also crumb softness. Ingredients like sugar and fibre, as well as appropriate baking conditions that boost moisture content, contribute to softness.

When essential oils are used in cake batters, the amount of air incorporated by the protein during the creaming stage of batter mixing is increased. The leavening gases produced during baking aid in the expansion of these air cells. A cake with a coarse, open crumb and reduced volume is produced by using fewer big air cells. The resulting cake will have a fine, close crumb with enhanced volume if the batter contains a large number of little air cells.

Reference:

https://www.naturalproductsinsider.com/regulatory/prolonging-bakery-product-life

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