Antioxidant Activities, Total Phenolics and Flavonoids Content in Two Varieties of Malaysia Young Ginger (Zingiber officinale Roscoe)

Abstract

Ginger (Zingiber officinale Roscoe) is a well known and widely used herb, especially in Asia, which contains several interesting bioactive constituents and possesses health promoting properties. In this study, the antioxidant activities of methanol extracts from the leaves, stems and rhizomes of two Zingiber officinale varieties (Halia Bentong and Halia Bara) were assessed in an effort to compare and validate the medicinal potential of the subterranean part of the young ginger. The antioxidant activity and phenolic contents of the leaves as determined by the 1,1-diphenyl-2-picryl-hydrazyl (DPPH) assay and the total amounts of phenolics and flavonoids were higher than those of the rhizomes and stems. On the other hand, the ferric reducing/antioxidant potential (FRAP) activity of the rhizomes was higher than that of the leaves. At low concentration the values of the leaves’ inhibition activity in both varieties were significantly higher than or comparable to those of the young rhizomes. Halia Bara had higher antioxidant activities as well as total contents of phenolic and flavonoid in comparison with Halia Bentong. This study validated the medicinal potential of the leaves and young rhizome of Zingiber officinale (Halia Bara) and the positive relationship between total phenolics content and antioxidant activities in Zingiber officinale.

Growth, physiological and biochemical responses of Meliaceae species - Azadirachta indica and Melia dubia to elevated CO2 concentrations

“…A strong positive correlation between Pn and gs, with a large increase in Pn with a relatively small decrease in gs has been reported also in Avena sativa [41]. The increase of phenols under eCO 2 is consistent with the general response of plants found positively correlated with photosynthetic rates, increase in soluble sugars and total non-structural carbohydrates [58][59]. In the present study, shoot and root length showed significant positive correlation (P>0.01) with Pn, gs, E and reducing sugars similar to the reports available.…”

Effect of osmotic dehydration on the physical and chemical properties of Mexican ginger (Zingiber officinalevar. Grand Cayman)

“…Grand Cayman) has been extensively used as a traditional medicine in the East. The main bioactive components of ginger are the gingerols, which possess antioxidant, anticancer, and anti-inflammatory attributes (Ghasemzadeh, Jaafar, & Rahmat, 2010). However, the high moisture content (70-75%) of ginger makes it susceptible to microbial contamination and insect infestation, resulting in significant loss and deterioration of product quality, drying could be a useful process to reduce product damage.…”

Determination of in vitro antidiabetic effects of Zingiber officinale Roscoe

“…Zingiber officinale (ginger) rhizome is one of the classic examples of an herb used for not only culinary preparations but also for unique therapeutic significance owing to its antioxidant, antimicrobial, anti-inflammatory and chemoprotective potential (Afzal et al, 2001;El-Ghorab et al, 2010;Ghasemzadeh et al, 2010;Rani et al, 2011;Al-Suhaimi et al, 2011;Baliga et al, 2011;Butt, Sultan, 2011;Rehman et al, 2011). Although several studies have mentioned antidiabetic activity of Zingiber officinale (Grover et al, 2002;Akhani et al, 2005;Kelble, 2005;Al-Amin et al, 2006;Büyükbalci, Sedef, 2008;Islam, Choi, 2008;Abd-Elraheem et al, 2009;Saraswat et al, 2009;Ogbera et al, 2010;Saraswat et al, 2010;Madkor et al, 2011;Ramudu et al, 2011;Rani et al, 2011), no data is available on protein glycation and glucose absorption inhibitory potential of native Zingiber officinale rhizomes at national level.…”