Pectic acid

Pectic acid

Names
Other names Pectate; Poly(1,4-α-D-galacturonate); α-D-Polygalacturonic acid
Identifiers
CAS Number	9046-40-6 Y
3D model (JSmol)	Interactive image
ChemSpider	388376 Y
PubChem CID	439239
InChI InChI=1S/C18H26O19/c19-1-2(20)10(13(26)27)36-17(6(1)24)35-9-4(22)7(25)18(37-12(9)15(30)31)34-8-3(21)5(23)16(32)33-11(8)14(28)29/h1-12,16-25,32H,(H,26,27)(H,28,29)(H,30,31)/t1-,2+,3+,4+,5+,6+,7+,8+,9+,10-,11-,12-,16-,17?,18?/m0/s1 Y Key: LCLHHZYHLXDRQG-ZNKJPWOQSA-N Y
SMILES O=C(O)[C@H]3OC(O[C@@H]1[C@H](O)[C@@H](O)C(O[C@@H]1C(=O)O)O[C@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)C(=O)O)[C@H](O)[C@@H](O)[C@H]3O
Properties
Chemical formula	(C6H8O6)n
Molar mass	Variable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Pectic acid, also known as polygalacturonic acid, is a water-insoluble, transparent gelatinous acid existing in over-ripe fruit and some vegetables. It is a product of pectin degradation in plants, and is produced via the interaction between pectinase and pectin (the latter being common in the wine-making industry.) In the early stage of development of fruits, the pectic substance is a water-insoluble protopectin which is converted into pectin by the enzyme protopectinase during ripening of fruit. In over-ripe fruits, due to the presence of pectic methyl esterase enzyme, the pectin gets largely converted to pectic acid which is water-insoluble. Due to this reason both immature and over-ripe fruits are not suitable for making jelly and only ripe fruits are used.

References

• G. O. Aspinall and A. Cañas-Rodriguez (1958). "810. Sisal pectic acid". Journal of the Chemical Society: 4020–4027. doi:10.1039/JR9580004020.