Supplementation of cooked broccoli with exogenous moringa myrosinase enhanced isothiocyanate formation.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory food chemistry experiment without human or animal subjects
PubMed 35820274 · doi:10.1016/j.foodchem.2022.133651
What was done
Researchers evaluated the effect of cooking time (1 minute of microwaving) and the addition of exogenous myrosinase from ground moringa seeds on the formation of isothiocyanates (ITCs) in broccoli. They also characterized the optimal pH, thermal stability, and kinetic affinity of moringa myrosinase compared to broccoli myrosinase using sinigrin as a substrate.
What was found
Microwaving raw broccoli for 1 minute reduced ITC generation by nearly 40%. Supplementing the cooked broccoli with ground moringa seeds containing exogenous myrosinase increased ITC formation by 38%. Moringa myrosinase demonstrated optimal activity at pH 4.0–6.0, higher thermal stability than broccoli myrosinase, and a higher kinetic affinity for sinigrin.
Why it matters
Cooking frequently denatures endogenous myrosinase in brassica vegetables, curtailing the conversion of glucosinolates into bioactive isothiocyanates. Adding heat-stable exogenous moringa seed myrosinase provides a food-based strategy to restore isothiocyanate yield in prepared broccoli.
Limits
The study was entirely in vitro with no human dietary intervention or pharmacokinetic measurements to confirm in vivo bioavailability. Specific sample replication counts, exact concentration metrics, and statistical dispersion were omitted from the abstract.
Cited by
- supports Moringa, daikon radish, mustard seed, wasabi, and horseradish are rich sources of the enzyme myrosinase.