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A 2011 study published in Food Chemistry examined blanching (cooking asparagus briefly in boiling water) and saw a marked difference in the asparagus depending on how long the vegetable was submerged

doi:10.1016/j.bbagen.2012.10.012 Ballatori N, Krance SM, Notenboom S, Shi S, Tieu K, Hammond CL

Color shift from clear or pale yellow to darker yellow or brown indicates oxidation reduced glutathione (GSH) converting to oxidised glutathione disulfide (GSSG)

Glutamate is primarily released from neurons by fusing intracellular glutamate-filled vesicles into the synapse, with the expelled glutamate dispersing through entropy

Lord et al., 2018)