nonanal

105 µg per capsule

Hay, like dried grass or cucumber skin”

Certified water flavour standard used to train professional tasters to recognize and scale the intensity of hay character. Nonanal is formed by bacteria growing in water or contributed, pre-formed, by ground water pollution. This flavour is also occasionally associated with PET packaging of bottled water, being derived from a lubricant used in their production. It imparts a pleasant, but nevertheless atypical, dry grass note to water, reminiscent of cucumber skin at higher concentrations.

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

Flavour cards

Flavour standard information

Technical specification

Assessment
Hay-like flavours in water can be detected in the following way. Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
105 µg per capsule
Threshold
The flavour threshold of nonanal in water is 35 µg / l.
Origins
Nonanal is formed by bacteria growing in water, or contributed, pre-formed, by ground water pollution. It can also be formed from amino acids as a by-product of ozonation.
Importance
Nonanal imparts a pleasant, but nevertheless atypical, dry grass note to water, reminiscent of cucumber skin at higher concentrations.
CAS registry number
The CAS registry number for nonenal is 124-19-6.
Other names
  • 1-nonaldehyde
  • nonanoic aldehyde
  • nonoic aldehyde
  • nonyl aldehyde
  • nonylic aldehyde
  • pelargonaldehyde
  • pelargonic aldehyde
Remarks
Nonanal may be found in association with other aldehydes such as hexanal in water. It is an occasional off-odour in bottled water, associated with use of PET bottles and cap liners, the source being a fatty acid amide lubricant oxidized by ozone treatment.
Threshold distribution
Graph
Capsules per pot
10
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