title: Antioxidant and cytotoxic potential of a new thienyl derivative from Tagetes erecta roots.
abstract: BACKGROUND
  The search for newer compounds against pathogenic species continues unabated due to drug resistance. Traditionally, Tagetes erecta Linn. (Compositae) has been used for the treatment of various parasitic and microbial diseases.
  
  
  OBJECTIVE
  To evaluate the antioxidant activity of the ethanol extract of Tagetes erecta roots and its cytotoxicity against prostate and HeLa cancer cell lines followed by activity-guided isolation.
  
  
  METHODS
  The antioxidant screening was carried out using diphenylpicrylhydrazyl (DPPH) radical scavenging assay with serial concentrations ranging from 2 to 100 µg/mL, and cytotoxicity was evaluated against prostate (PC-3) and HeLa cell lines using microculture tetrazolium test (MTT) assay with concentrations ranging from 500 to 1.89 µg/mL. Isolation of the ethanol extract was carried out using column chromatography whereby 21 isolates were obtained (T₁-T₂₁), and the most active isolate was subjected for characterization using ultraviolet (UV), infrared (IR), nuclear magnetic resonance (NMR), and mass spectroscopic techniques.
  
  
  RESULTS
  The ethanol extract scavenged DPPH free radicals thereby exhibiting antioxidant activity with an IC₅₀ of 35.9 µg/mL. In addition, the extract conferred noticeable cytotoxicity against the HeLa (LD₅₀ of 164.28 µg/mL) and PC-3 cell lines (LD₅₀ of 407.3 µg/mL). Among all the isolates, T₃ showed antioxidant activity with IC₅₀ of 11.56 µg/mL and cytotoxicity with LD₅₀ of 12.5 µg/mL against HeLa and 30.25 µg/mL against PC-3 cell lines and was characterized as 2-ethynyl-5-(thiophen-2-yl) thiophene.
  
  
  CONCLUSIONS
  The new thienyl compound (T₃) exhibited profound antioxidant activity and cytotoxicity at relatively lower concentrations than the extract.
  
  
  CONCLUSIONS
  The observations provide support for the ethnobotanical use of the plant.
authors: Department of Pharmacognosy and Phytochemistry, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, India. gupta.aiims@gmail.com
authors: Pankaj
authors: P
authors: Gupta
authors: Alka
authors: A
authors: Gupta
authors: Krati
authors: K
authors: Agarwal
authors: Priti
authors: P
authors: Tomar
authors: Saurabh
authors: S
authors: Satija
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D000975:Antioxidants / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D055808:Drug Discovery; D020834:Ethnopharmacology; D005260:Female; D016166:Free Radical Scavengers / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D007194:India; D020128:Inhibitory Concentration 50; D008297:Male; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D018517:Plant Roots / Q000737:chemistry; D011471:Prostatic Neoplasms / Q000188:drug therapy*; D031686:Tagetes / Q000737:chemistry*; D013876:Thiophenes / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D002583:Uterine Cervical Neoplasms / Q000188:drug therapy*
chemical_list: C576584:2-ethynyl-5-(thiophen-2-yl)thiophene; D000972:Antineoplastic Agents, Phytogenic; D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts; D013876:Thiophenes