Taste and flavor enhancement are often induced through the use of savory umami compounds such as glutamic acid and 5′-nucleotides. These compounds are found at high levels in numerous natural ingredients. Utilizing such natural ingredients within real food systems, such as meat products, requires consideration of the other taste and flavor attributes that the ingredient contributes. Quantification of umami amino acids and nucleotides allows the predicted equivalent umami concentration (EUC) to be calculated. In this study, an increase in EUC led to increased umami taste perception within meat products, however where sweetness and acidity were concurrently increased, the overall umami taste was suppressed.
Propylene glycol (1,2-propanediol, PG) is a solvent commonly used in the preparation of commercial food flavorings. Under acidic or basic conditions, PG can react with components of food flavorings to give new compounds. Three particular reactions are described: the reaction of PG with aldehydes and ketones to give acetals and ketals, the reaction of PG with organic acids to give mono-and di-esters, and the transesterification reaction of PG with lactones to give dihydroxy esters. The effect of propylene glycol on the sensory quality of stored food flavorings is discussed.
2-Methyl-3-furanthiol (MFT) and its derivatives were identified for the first time in heated model systems containing ascorbic acid and cysteine. More MFT was formed with ascorbic acid compared to the analogous system containing ribose. It is suggested that in the ribose/cysteine system much of the cysteine was bound up in a semi-stable thiazolidine, thus limiting the formation of H2S and the subsequent conversion of norfuraneol to MFT.
The objective of this research was to compare the volatile aroma compounds and Maillard reaction precursors (free amino acids and sugars) of four cooked rice samples: two milled fragrant rice samples, a milled non-fragrant rice, and a brown non-fragrant rice. Rice was cooked using an electric rice cooker. The cooked brown rice contained more Maillard-derived volatiles and lipid-derived volatiles than the cooked milled rice. Cooking reduced levels of sugars and amino acids, but not consistently. Sucrose was substantially reduced in milled but not brown rice, while losses of amino acids were less and predominantly in milled rice.
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