Günter Kindel

4'-Hydroxyflavanones are the bitter-masking principles of herba santa

In sensory studies the flavanones homoeriodictyol, its sodium salt, and eriodictyol, which occur in Herba Santa (Eriodictyon californicum (H. & A.) Torr.) could significantly decrease the bitter taste of caffeine. Further investigations on homoeriodictyol sodium salt elicited a broad masking activity between 10 and 40% towards different chemical classes of bitter molecules (e.g. salicin, amarogentin, paracetamol, quinine) but not towards bitter linoleic acid emulsions.

Chapter 45 – Studies on Stability of Citrus Flavors and Insights into Degradation Pathways of Key Aroma Compounds

Model studies have been performed with individual citrus related aroma compounds such as citral, α-terpineol, α-terpinene, and others, in order to de-couple the complexity of citrus flavors. Degradation pathways and transformation rates have been determined for the most relevant compounds leading to the most prominent off-note compound p-methyl acetophenone. Citral is one of the main precursors. Catechins (flavan-3-ols) are often used as antioxidants for stabilization of flavor mixtures. The reactivity of catechins towards aldehydes is underestimated. In our study, we demonstrate the formation of covalent catechin–citral adducts – a reaction that might influence the aroma stability of citrus flavors in the presence of catechins. As a result, the freshness of citrus flavors and stability of key aroma-active substances can be improved, on the result of this study.