Imaging Mass Spectrometry Reveals In Situ Conversion of Glucosinolates to Bioactive Isothiocyanates in Cabbage.
Level 5 - mechanism / opinion, no new human data
Plant tissue analytical and imaging laboratory study with no human data
PubMed 41436433 · doi:10.1021/acs.jafc.5c10194
What was done
Glucosinolate (GSL) levels (including glucoraphanin and sinigrin) in intact and mechanically ruptured cabbage (*Brassica oleracea* var. *capitata*) samples were quantified using liquid chromatography-mass spectrometry (LC-MS). Imaging mass spectrometry (IMS) was then used to map the spatial distribution of GSL precursors and their conversion products, bioactive isothiocyanates (ITCs, including sulforaphane and allyl isothiocyanate), across tissue sections.
What was found
The abstract reports no numerical values or statistical metrics. Qualitatively, GSL precursors were localized primarily in intact tissue regions, whereas ITCs were detected predominantly in ruptured tissue regions, exhibiting a reciprocal spatial distribution upon cellular disruption.
Why it matters
This work provides the first direct spatial visualization of myrosinase-mediated GSL-to-ITC conversion directly within plant tissues. It demonstrates the utility of imaging mass spectrometry for tracking localized enzymatic transformations relevant to plant defense and food functionality.
Limits
The abstract provides no sample sizes (number of cabbage heads, slices, or analytical replicates) and lacks quantitative concentrations or recovery rates. The findings are restricted to ex vivo botanical tissue and do not assess human digestion, bioavailability, or clinical effects.
Cited by
- supports Intact broccoli plants contain the stable precursor molecule glucoraphanin rather than sulforaphane, which is highly reactive.
- supports Plant myrosinase converts vacuole-stored glucoraphanin into sulforaphane when plant tissue cells are ruptured.