trans,trans-2,4-heptadienal

210 µg per capsule

Rancid oil, like cod liver oil”

Certified water flavour standard used to train professional tasters to recognize and scale the intensity of rancid oil character. Heptadienal is formed by algae in lakes and reservoirs. It is produced by both actively growing cells and as a result of the decomposition of dead cells. This compound imparts a rancid odour, reminiscent of cod liver oil. At higher concentrations the flavour is perceived as fishy.

Food grade | free from sensory impurities | extensively tested | safe to smell and taste.

Flavour cards

Flavour standard information

Technical specification

Assessment
The best way to detect 2,4-heptadienal in water is as follows Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
210 µg per capsule
Threshold
The flavour threshold of 2,4-heptadienal in water is 700 µg / l.
Origins
2,4-Heptadienal is formed by algae in lakes and reservoirs. It is produced by both actively-growing organisms and through cell lysis and decomposition.
Importance
2,4-Heptadienal Imparts a rancid oil note to water, reminiscent of cod liver oil. At higher concentrations the odour of heptadienal can be perceived as fishy.
CAS registry number
The CAS registry number of 2,4-heptadienal is 4313-03-5.
Other names
  • (2E,4E)-hepta-2,4-dienal
  • (2trans,4trans)- hepta-2,4-dienal
  • (E)-2,(E)-4-heptadien-1-al
  • (E,E)-2,4-heptadien-1-al
  • trans-2,trans-4-heptadien-1-al
  • trans,trans-2,4-heptadien-1-al
  • (E,E)-2,4- heptadienal
Remarks
2,4-Heptadienal is unstable at low pH values and does not survive well in acidic waters.
Threshold distribution
Graph
Capsules per pot
10
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