I do not know if this makes a difference, but is Yellow the best mustard seed? The complete study was not at the link.
"Thermal and pressure stability of myrosinase enzymes from black mustard (Brassica nigra L. W.D.J. Koch. var. nigra), brown mustard (Brassica juncea L. Czern. var. juncea) and yellow mustard (Sinapsis alba L. subsp. maire) seeds."
"This study investigates the effects of temperature and pressure on inactivation of myrosinase extracted from black, brown and yellow mustard seeds. Brown mustard had higher myrosinase activity (2.75 un/mL) than black (1.50 un/mL) and yellow mustard (0.63 un/mL). The extent of enzyme inactivation increased with pressure (600-800 MPa) and temperature (30-70° C) for all the mustard seeds. However, at combinations of lower pressures (200-400 MPa) and high temperatures (60-80 °C), there was less inactivation. For example, application of 300 MPa and 70 °C for 10 min retained 20%, 80% and 65% activity in yellow, black and brown mustard, respectively, whereas the corresponding activity retentions when applying only heat (70° C, 10 min) were 0%, 59% and 35%. Thus, application of moderate pressures (200-400 MPa) can potentially be used to retain myrosinase activity needed for subsequent glucosinolate hydrolysis."
Olukayode Adediran Okunade, Sameer Khalil Ghawi, Lisa Methven, Keshavan Niranjan
Department of Food and Nutritional Sciences, University of Reading, Whiteknights,
P.O Box 226, Reading, RG6 6AP, UK
https://www.ncbi.nlm...pubmed/25977054
A pdf file was on a site. Here is a part:
"4 Conclusion
Myrosinase from different mustard species varied in terms of specific enzyme activity as
well as temperature and pressure stability. Brown mustard myrosinase had the highest
overall myrosinase activity and specific activity. Brown and black mustard myrosinase were
more resistant to pressure and thermal treatment than myrosinase from yellow mustard.
Combined high pressure-thermal treatment (up to 70 °C and 800 MPa) completely
inactivated myrosinase from the mustards studied. However, at low pressure (200-400
MPa), inactivation temperature increased in the mustard samples studied with lower rate of
loss in myrosinase activity compared to any of thermal, pressure and combined high
pressure-thermal treatment. This difference in myrosinase stability could be utilized to
control the hydrolysis level of glucosinolates when mustard seeds are used as a condiment
along with cooked Brassica vegetables. This could have important health implications
through increasing the delivery of bioactive isothiocyanates from the Brassica. In addition,
controlling enzyme activity can also be used to regulate sensory attributes of Brassica
vegetables."
Edited by Heisok, 04 February 2017 - 03:21 AM.