{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T20:41:25Z","timestamp":1778618485469,"version":"3.51.4"},"reference-count":24,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2006,1,18]],"date-time":"2006-01-18T00:00:00Z","timestamp":1137542400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Mass Spectrom."],"published-print":{"date-parts":[[2006,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The accumulation of As and Cd in <jats:italic>Brassica juncea<\/jats:italic> plants and the formation of complexes of these elements with bioligands such as glutathione and\/or phytochelatins (PCs) is studied. The genetic manipulation of these plants to induce higher As and Cd accumulation has been achieved by overexpressing the genes encoding for <jats:italic>gamma\u2010glutamyl cysteine synthetase<\/jats:italic> (\u03b3\u2010ECS) and <jats:italic>glutathione synthetase<\/jats:italic> (GS). These two enzymes are responsible for glutathione (GSH) formation in plants, which is the first step in the production of PCs. The biomass produced in both the wild type and the genetically modified plants, has been evaluated. Additionally, the total Cd and As concentration accumulated in the plant tissues was measured by inductively coupled plasma mass spectrometry (ICP\u2010MS) after extraction. Speciation studies on the extracts were conducted using size exclusion liquid chromatography (SEC) coupled online with ICP\u2010MS to monitor As, Cd and S. For further purification of the As fractions, reversed phase high performance liquid chromatography (RP\u2010HPLC) was used. Structural elucidation of the PCs and other thiols, as well as their complexes with As and Cd, was performed by electrospray\u2010quadrupole\u2010time\u2010of\u2010flight (ESI\u2010Q\u2010TOF). In both the Cd and As exposed plants it was possible to observe the presence of oxidized PC<jats:sub>2<\/jats:sub> ([M + H]<jats:sup>+<\/jats:sup>, <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 538), GS\u2010PC<jats:sub>2<\/jats:sub>(\u2010Glu) ([M + H]<jats:sup>+<\/jats:sup>, <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 716) as well as reduced GSH ([M + H]<jats:sup>+<\/jats:sup>, <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 308) and oxidized glutathione (GSSG) ([M + H]<jats:sup>+<\/jats:sup>, <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 613). However, only the GS plants exhibited the presence of As(GS)<jats:sub>3<\/jats:sub> complex ([M + H]<jats:sup>+<\/jats:sup>, <jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 994) that was further confirmed by MS\/MS. This species is reported for the first time in <jats:italic>B. juncea<\/jats:italic> plant tissues. Copyright \u00a9 2006 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/jms.992","type":"journal-article","created":{"date-parts":[[2006,1,18]],"date-time":"2006-01-18T16:54:55Z","timestamp":1137603295000},"page":"323-331","source":"Crossref","is-referenced-by-count":39,"title":["Study of phytochelatins and other related thiols as complexing biomolecules of As and Cd in wild type and genetically modified <i>Brassica juncea<\/i> plants"],"prefix":"10.1002","volume":"41","author":[{"given":"Ana Pereira","family":"Navaza","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria","family":"Montes\u2010Bay\u00f3n","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danika L.","family":"LeDuc","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norman","family":"Terry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alfredo","family":"Sanz\u2010Medel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,1,18]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0065-2113(02)75002-5"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/0735-260291044313"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1055\/s-2002-37399"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1104\/pp.014118"},{"key":"e_1_2_6_6_2","first-page":"10 118","article-title":"Long\u2010distance root\u2010to\u2010shoot transport of phytochelatins and cadmium in Arabidopsis","volume":"100","author":"Gong JM","year":"2003","journal-title":"Plant Biol."},{"key":"e_1_2_6_7_2","first-page":"595","article-title":"Metal\u2010binding properties of phytochelatin\u2010related peptides","volume":"86","author":"Satofuka H","year":"2001","journal-title":"J. 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