"Purplish Blue" or "Greenish Grey"? Indigo Qualities and Extraction Yields from Six Species.

ABSTRACT: Indigo quality is determined by its indigotin content. Another quality indicator is colour. For an evaluation of species, indigo samples from Indigofera tinctoria, Indigofera suffruticosa, Indigofera arrecta, Persicaria tinctoria, Strobilanthes cusia and Wrightia laevis cultivated in Austria and China were visually classified and analysed spectrophotometrically and using a L*a*b* measuring device. In addition to a standardised hot-extraction method without lime, some samples were extracted simulating traditional methods at ambient temperatures using lime. The highest indigotin contents were achieved with Indigofera arrecta (55%, Austria) and Strobilanthes cusia (56%, China). There were no statistically significant differences between

SUBMITTER: Hartl A 

PROVIDER: S-EPMC11013892 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature