Maillard reaction
process / process-maillard-reaction
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Maillard reaction is a nonenzymatic reaction in which reducing sugars and amino compounds react on heating, producing browning, aroma compounds, and compounds related to bitterness. It is one chemical basis of roasting and scorching.
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Reading the bitterness
The Maillard reaction is a nonenzymatic reaction of reducing sugars and amino compounds under heat. It generates browning, aroma compounds, and bitterness-related compounds, forming one chemical basis for roasting and scorching. A review of Maillard-product flavors summarizes how free amino acids formed vary by temperature: umami-associated free amino acids form more readily at 80–100°C with cysteine present, whereas bitter-associated ones form more readily at 100–120°C. The review also states that both bitter- and umami-associated free amino acid concentrations rise at still higher temperatures.
In summarizing studies of Maillard products derived from protein hydrolysates, the same review states that reaction-product groups with added cysteine had the strongest flavor and that all these products had lower bitterness. The relevant passage, however, gives neither the comparison conditions nor numerical reduction in bitterness.
In a cell experiment focused on bitterness reception, glycated beef protein hydrolysate products of the Maillard reaction (BPAH-AGEs and BPCH-AGEs) were added to a cultured-cell assay stimulated with quinine. Quinine-evoked calcium mobilization was inhibited by 96% with BPAH-AGEs and 92% with BPCH-AGEs (p<0.05). This assay measures a receptor-level response; by itself it does not show correspondence to the intensity of bitterness perceived by humans.
Sources for this overview
Insights into flavor and key influencing factors of Maillard reaction products: A recent update
Checked for this overview: Used to explain how production of bitter- and umami-associated free amino acids differs by heating range. / Used for the review's summary that cysteine-added reaction products had lower bitterness.
Glycated Beef Protein Hydrolysates as Sources of Bitter Taste Modifiers
Checked for this overview: Used for the inhibition percentages of quinine-induced calcium mobilization in a cell assay.
Follow the connections
Maillard reaction →can decrease→ bitterness →can be measured separately …→ astringency
Structured claims — open a section to read each claim's confidence, evidence and limits
Composition and content (2)
Scope: Layer: solution. A statement from a review that integrates multiple primary studies dealing with heated model reaction systems (free amino acids, reducing sugars, and the like).
Note: This is a review's summary of multiple primary studies; the conditions of the individual primary data (whether a panel was used, concentrations) have not been confirmed in this assessment.
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process-maillard-reaction —develops_bitterness_depending_on→ "Heating temperature range (at 100-120°C, bitter free amino acids tend to form preferentially; at 80-100°C with cysteine present, umami free amino acids tend to form preferentially)"Scope: Layer: solution. Taste comparison of protein-hydrolysate-derived Maillard reaction products (MRPs) with cysteine added.
Note: The review summarizes a primary study, but its relevant passage gives no specific reduction percentage, statistics, or comparator conditions.
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process-maillard-reaction —can_decrease→ sensation-bitterMechanism and receptors (1)
Scope: Layer: cells. Effect of adding glycated beef protein hydrolysate to a quinine-stimulated cell assay (Fluo-4 NW calcium-mobilization assay).
Note: Alongside reduced bitterness measured by electronic tongue, the quinine-induced calcium response was inhibited at the cell level.
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process-maillard-reaction —can_decrease→ sensation-bitter