Chemical fact sheet: Indigo

Indigo

Basics

Category
Indolics & indole alkaloid derivatives
IUPAC-name
(E)-[2,2'-biindolinylidene]-3,3'-dione
Formula
No formula stored
Exact mass
262.07420 g/mol
Molecular weight
No weights stored
Structure
Chemical structure of indigo
Figure 1.1: Chemical structure of indigo

Sources

In summary, the chemical indigo has been analyzed from following sources:

Isatis indigotina
1st
Isatis tinctoria Thüringer Waid  L.
1st

Note that an analysis result in the database may indicate either presence or lack thereof of a chemical in an analyzed sample.

References

  1. M. Tobias, I. Plitzko, and M. Hamburger, "A comprehensive metabolite profiling of Isatis tinctoria leaf extracts.," Phytochemistry , vol. 70 , no. 7 , pp. 924-934 , DOI: 10.1016/j.phytochem.2009.04.019 .

Analysis results

Analysis result 1

Detection technique Values Units
UV/Vis 243
285
606 		nm
[M⁺ H]⁺ 263 m/z
MS²⁺ 219
235 		m/z
STD
True
TLC
False
UV/Vis detector description
HPLC-PDA, photodiode array (PDA)
Mass spectrometer description
HPLC-ESI-MS, ion trap, HPLC-TOF-MS, APCI
Organism
Isatis tinctoria Thüringer Waid  L.
cultivated
ground, dried, cut into small pieces
Collection dates
2003-9
Sample note
The plants were cultivated on the experimental plots of the Agricultural Research Station of Thuringia (TLL), Dornburg, Germany. Specimens of seeds from the strains are kept at the TLL, under accessions number 153/PG 1 (Thüringer Waid).
Drying methods
oven-dried
Drying temperature
40 °C
Dried material storage temperature
15 °C
Dried material storage notes
dark; in the brown glass bottles
Extraction solvents
dichloromethane
Extraction repeats
2
Extraction time
12 min
Extraction temperature
70 °C
Analysis solvents
dichloromethane
Detection note
[M + H]+ 263 (both ESI+ and APCI +)
References

M. Tobias, I. Plitzko, and M. Hamburger, "A comprehensive metabolite profiling of Isatis tinctoria leaf extracts.," Phytochemistry , vol. 70 , no. 7 , pp. 924-934 , DOI: 10.1016/j.phytochem.2009.04.019 .

Analysis result 2

Detection technique Values Units
UV/Vis 243
285
606 		nm
[M⁺ H]⁺ 263 m/z
MS²⁺ 219
235 		m/z
STD
True
TLC
False
UV/Vis detector description
HPLC-PDA, photodiode array (PDA)
Mass spectrometer description
HPLC-ESI-MS, ion trap, HPLC-TOF-MS, APCI
Organism
Isatis indigotina
cultivated
ground, dried, cut into small pieces
Collection dates
2003-9
Sample note
The plants were cultivated on the experimental plots of the Agricultural Research Station of Thuringia (TLL), Dornburg, Germany. Specimens of seeds from the strains are kept at the TLL, under accessions number 153 PG 12 (I. indigotina).NOTE. There are conflicting views on the taxonomy of I. tinctoria (European woad) and I. indigotica (Chinese woad). I. indigotina was described for the first time by Fortune in 1846, and initially considered as a distinct species. Afterward, some taxonomists have classified it as a variety of I. tinctoria. Nowadays, I. indigotina is considered as a synonym of I. tinctoria [e.g. The Plant List, IPNI (International Plant Name Index), Tropicos]. (Speranzo et al. 2020). In this database, we use the names similarly as the authors.
Drying methods
oven-dried
Drying temperature
40 °C
Dried material storage temperature
15 °C
Dried material storage notes
dark; in the brown glass bottles
Extraction solvents
dichloromethane
Extraction repeats
2
Extraction time
12 min
Extraction temperature
70 °C
Analysis solvents
dichloromethane
Detection note
[M + H]+ 263 (both ESI+ and APCI +)
References

M. Tobias, I. Plitzko, and M. Hamburger, "A comprehensive metabolite profiling of Isatis tinctoria leaf extracts.," Phytochemistry , vol. 70 , no. 7 , pp. 924-934 , DOI: 10.1016/j.phytochem.2009.04.019 .