-ine

-ine is a suffix used in chemistry to denote two kinds of substance. The first is a chemically basic and alkaloidal substance. It was proposed by Joseph Louis Gay-Lussac in an editorial accompanying a paper by Friedrich Sertürner describing the isolation of the alkaloid "morphium", which was subsequently renamed to "morphine".^[1] Examples include quinine, morphine and guanidine.^[2] The second usage is to denote a hydrocarbon of the second degree of unsaturation. Examples include hexine and heptine.^[2] With simple hydrocarbons, this usage is identical to the IUPAC suffix -yne.

The suffix is usually pronounced either /iːn/ or /ɪn/ depending on the word it appears in and the accent of the speaker. In a few words (for example, quinine and strychnine), the /aɪn/ sound is normal in some accents. Gasoline ends with /iːn/; glycerine more often with /ɪn/ than with /iːn/.

The suffix -in (/ɪn/) is etymologically related and overlaps in usage with -ine. Many proteins and lipids have names ending with -in: for example, the enzymes pepsin and trypsin, the hormones insulin and gastrin, and the lipids stearin (stearine) and olein.

References

↑ Sneader W. (2005). Drug Discovery: A History, pp. 90-91. Wiley.
1 2 "Definition -ine". Centre for Cancer Education. Archived from the original on 2009-08-05. Retrieved 2008-03-29.

Organic chemistry affixes

Carbon-based	-ane (alkane) -ene (alkene) -ine (unsaturated hydrocarbon) -yne (alkyne) alk- (saturated hydrocarbon) ar- (aromatic)

Oxygen-based	-al (aldehyde) -oate (ester) -oic acid (carboxylic acid) -ol (alcohol) -one (ketone) -ose (sugar)

Nitrogen-based	-ine (alkaloid) aza- (N replaces C)

Sulfur-based	thio- (S replaces O)

Counting axial atoms	meth- (1) eth- (2) prop- (3) but- (4) (and the rest are ordinary Greek/Latin numbers)

Other	-ase (enzyme) -yl (radical)

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