Polyphenolic Composition and Antioxidant Activities of 6 New Turmeric (Curcuma Longa L.) Accessions

Abstract

The phytochemical composition and antioxidant capacities of 6 new NRCRI turmeric (Curcuma longa L.) accessions (39, 35, 60, 30, 50 and 41) were determined using standard techniques. The moisture contents of the tumeric samples ranged from 15.75 to 47.80% and the curcumin contents of the turmeric samples fell within the range of curcumin obtained from turmeric in other countries of the world. Furthermore, the turmeric accessions contained considerable amounts of antioxidants (measured using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and reducing power assays), alkaloids, flavonoids, anthocyanins, and phenolics. There was significant correlation between the anthocyanin contents of the tumeric accessions versus their alkaloid (0.744) and flavonoid contents (0.986) suggesting an additive effect between the anthocyanins and alkaloids in turmeric; significant correlation between the inhibition of the turmeric accessions on DPPH radical versus their flavonoid (0.892) and anthocyanin (0.949) contents and significant correlation between the reducing power of the turmeric accessions versus their flavonoid (0.973) and anthocyanin (0.974) contents suggesting that anthocyanins as flavonoids largely contribute to the antioxidant activities of turmeric. The positive regression recorded between inhibition of DPPH radical by the turmeric accessions and quercetin versus reducing power (R2 = 0.852) suggest that any of these methods could be used to assess the antioxidant activities of tumeric. Finally, the study indicated the potentials of the turmeric accessions especially accessions 30 and 50 as promising sources of antioxidants.

The In Vitro Antioxidant Activity and Phytochemicals of Locally Consumed Plant Foods from Quezon Province, Philippines

“…longa (luyang dilaw) grown in Nigeria and Bangladesh and P. umbellatum (kamamba) variety in Pennsylvania, USA were reported with significant reducing power. 23,[26][27] Z. officinale (luya) rhizome showed significant ferric ion reduction (76.24% reduction) even at the lowest concentration of 12.79 µg/mL, which agrees with the reducing potencies of reference standards as shown: Trolox > BHT > Ginger > α-tocopherol. [28][29] Potential plant materials, D. esculentum (pako) leaves and D. philippinensis (katmon) fruit, showed effective reductive activity of 70.56±6.6% and 68.36±11.6% at 50.9 µg/mL and 36.77±12.8% and 44.53±23.1% at 12.7 µg/mL, respectively.…”

Biochemistry, Safety, Pharmacological Activities, and Clinical Applications of Turmeric: A Mechanistic Review

“…e bioactive components present in turmeric volatile oil include tumerone that is reported to be effective against carcinogenesis. e previous investigation indicated that turmeric had distinctive antioxidant potential [64]. Curcumin removed turmeric oleoresin which is the resource material for the production of curcumin and contains oil, resin, and nonextractable curcumin.…”

Does Curcuma longa root powder have an effect against CCl4-induced hepatotoxicity in rats: a protective and curative approach

“…In traditional medicine, it usually serves to treat liver disorders including liver fibrosis. Turmeric possesses antiviral (Kim et al, 2009), anti-inflammatory (Bereswill et al, 2010), antioxidant (Al-Jassabi et al, 2012;Chinedum et al, 2015;Tanvir et al, 2017), antidiabetic (Aziz et al, 2013) and anticancer (Abdel-Lateef et al, 2016) properties. Liver is one of the important organs of the body which plays a major role in the metabolism of proteins, carbohydrates, lipids.…”