2. Types of
Pectin as extracted
normally has more than 50% of the acid units esterified, and is classified
as "high methyl ester (HM) pectin".
HM pectin formula
of ester groups is called degree of esterification. High methyl ester
pectins are classified in groups according to their gelling temperature
as rapid set to slow set pectins (see application
the extraction process, or continued acid treatment, will yield a
"low methyl ester LM) pectin" with less than 50% methyl
LM pectin formula
Some pectins are
treated during manufacture with ammonia to produce amidated pectins,
which have particular advantages in some applications.
Within each of
these main types, there are many detailed variations prepared for
of pectin molecules is the key to the properties of pectins, and their
use in different applications.