title: Determination and characterization of cysteine, glutathione and phytochelatins (PC₂₋₆) in Lolium perenne L. exposed to Cd stress under ambient and elevated carbon dioxide using HPLC with fluorescence detection.
abstract: Metal-binding thiols, involved in detoxification mechanisms in plant and other organism under heavy metal stress, are receiving more and more attentions, and various methods have been developed to determine related thiols such as cysteine (Cys), glutathione (GSH) and phytochelatins (PCs). In present study, an HPLC method was established for simultaneous determination of Cys GSH and PC(2-6) after treatment with disulfide reductant of tris (2-carboxyethyl) phosphine hydrochloride (TCEP) and thiolyte reagent of monobromobimane (mBBr). The separation of thiol derivatives was performed on an Agilent Zorbax Eclipse XDB-C18 column (4.6 mm × 30 mm, 1.8 μm) with a linear gradient elution of 0.1% (v/v) trifluoroacetic acid (TFA)-acetonitrile (ACN) at 0.8 mL min(-1). The temperature of the column was maintained at 25°C. The excitation and emission wavelengths were set at 380 and 470 nm, respectively. The thiol derivatives were well separated in 19 min, and the total analysis time was 30 min. The established method was proved selective, specific and reproducible, and could be applicable to determine Cys, GSH and PC(2-6) and to evaluate their roles in detoxification mechanisms in Cd-treated Lolium perenne L. under ambient and elevated carbon dioxide (CO(2)). It was found that the total SH contents and proportions of thiols in roots and shoots were dependent on Cd concentration, whereas the total SH contents decreased and the proportions of thiols altered without significance at elevated CO(2) level.
authors.affiliation: Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, PR China.
authors.forename: Xue Hai
authors.initials: XH
authors.lastname: Ju
authors.forename: Shirong
authors.initials: S
authors.lastname: Tang
authors.forename: Yan
authors.initials: Y
authors.lastname: Jia
authors.forename: Junkang
authors.initials: J
authors.lastname: Guo
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Ding
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Song
authors.forename: Yujie
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D002104:Cadmium / Q000633:toxicity*; D002245:Carbon Dioxide / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003545:Cysteine / Q000032:analysis* / Q000378:metabolism; D004355:Drug Stability; D005453:Fluorescence; D005978:Glutathione / Q000032:analysis* / Q000378:metabolism; D016014:Linear Models; D008129:Lolium / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D054811:Phytochelatins / Q000737:chemistry* / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism; D018520:Plant Shoots / Q000737:chemistry / Q000378:metabolism; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013312:Stress, Physiological / Q000187:drug effects*; D013696:Temperature
chemical_list: D002104:Cadmium; D002245:Carbon Dioxide; D054811:Phytochelatins; D005978:Glutathione; D003545:Cysteine