Antioxidant activity of noni juice in heavy smokers

Mian Ying Wang, M. Nawal Lutfiyya, Vicki Weidenbacher-Hoper, Gary Anderson, Chen X. Su, Brett J. West

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Background. Noni (Morinda citrifolia) juice has demonstrated antioxidant activity in vitro and in vivo. To evaluate this activity in humans, noni juice from Tahiti (TNJ) was evaluated in a 30 day, double-blind, and placebo controlled clinical trial with 285 current heavy smokers. Research participants were randomly assigned to three daily treatment groups: 118 mL placebo, 29.5 mL TNJ, and 118 mL TNJ. Plasma superoxide anion radicals (SAR) and lipid hydroperoxide (LOOH) levels were measured pre and post-intervention. Results. After 30 days, mean SAR decreased from 0.26±0.14 to 0.19±0.10 mol/mL in the 29.5 mL dose group (P < 0.01) and from 0.26±0.22 to 0.18± 0.11 mol/mL in the 118 mL dose group (P < 0.001). LOOH levels decreased from 0.53±0.19 to 0.40±0.10 mol/mL in the 29.5 mL dose group (P < 0.001) and from 0.55±0.21 to 0.40±0.14 mol/mL in the 118 mL dose group (P < 0.001). No significant reductions in SAR or LOOH levels were observed in the placebo group. Conclusion. The results suggest an antioxidant activity from noni juice in humans exposed to tobacco smoke, thereby replicating the results found previous chemical and in vivo tests.

Original languageEnglish (US)
Article number13
JournalChemistry Central Journal
Issue number1
StatePublished - 2009
Externally publishedYes

Bibliographical note

Funding Information:
MYW received funding through a grant made to the University of Illinois College of Medicine at Rockford by Morinda Holdings, Inc., a manufacturer of noni juice. CXS and BJW are employees of Tahitian Noni International, a division of Morinda Holdings, Inc. No competing interests exist for the remaining authors.

Funding Information:
Summer Jensen, Johnathan Fritz, 'Afa K. Palu assisted in completion of the LOOH and SAR assays. Funding for this project was provided by Morinda Inc., Provo, Utah, USA.


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