Saponarin is a

flavone Flavone is an organic compound with the formula . A white solid, flavone is a derivative of chromone with a phenyl (Ph) substituent adjacent to the ether group. The compound is of little direct practical importance, but susbstituted derivatives, ...

glucoside A glucoside is a glycoside that is derived from glucose. Glucosides are common in plants, but rare in animals. Glucose is produced when a glucoside is hydrolysed by purely chemical means, or decomposed by fermentation or enzymes. The name was ...

. It is found in '' Saponaria officinalis'' and in ''

Strongylodon macrobotrys ''Strongylodon macrobotrys'', commonly known as jade vine, emerald vine''The Royal Horticultural Society A–Z Encyclopedia of Garden Plants'', ed. Christopher Brickell, Dorling Kindersley, London, 1996, , p987 or turquoise jade vine, is a specie ...

'' where it imparts the characteristic jade color to the flower. This coloration has been shown to be an example of

copigmentation Copigmentation is a phenomenon where pigmentation due to anthocyanidins is reinforced by the presence of other colorless flavonoids known as cofactors or “copigments”. This occurs by the formation of a non-covalently-linked complex. Examples ...

, a result of the presence of

malvin Malvin is a naturally occurring chemical of the anthocyanin family. Malvin reacts in the presence of H2O2 to form malvone. The ortho-benzoyloxyphenylacetic acid esters reaction product is dependant of the pH: it is obtained under acidic conditio ...

(an

anthocyanin Anthocyanins (), also called anthocyans, are water-soluble vacuolar pigments that, depending on their pH, may appear red, purple, blue, or black. In 1835, the German pharmacist Ludwig Clamor Marquart gave the name Anthokyan to a chemical com ...

) and saponarin in the ratio 1:9. Under the

alkali In chemistry, an alkali (; from ar, القلوي, al-qaly, lit=ashes of the saltwort) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a ...

ne conditions ( pH 7.9) found in the sap of the epidermal cells, this combination produced a blue-green pigmentation; the pH of the colorless inner floral tissue was found to be lower, at pH 5.6. Experiments showed that saponarin produced a strong yellow colouring in slightly alkaline conditions, resulting in the greenish tone of the flower.Greenish blue flower colour of Strongylodon macrobotrys. Kosaku Takeda, Aki Fujii, Yohko Senda and Tsukasa Iwashina, Biochemical Systematics and Ecology, Volume 38, Issue 4, August 2010, Pages 630–633, It is also found in passion flowers (''

Passiflora ''Passiflora'', known also as the passion flowers or passion vines, is a genus of about 550 species of flowering plants, the type genus of the family Passifloraceae. They are mostly tendril-bearing vines, with some being shrubs or trees. The ...

sp.'').

References

Flavone glucosides C-glycoside natural phenols {{aromatic-stub