EFFECT OF THE BENCH SCALE EXTRACTION CONDITIONS ON Pinus radiata BARK EXTRACT YIELD, ANTIOXIDANT PROPERTIES AND COMPOSITION

Rhizophora mangle, the red mangrove, has long been known as a traditional medicine. Its bark has been used as astringent, antiseptic, hemostatic, with antifungic and antiulcerogenic properties. In this paper, we aimed to evaluate the antioxidant properties of a buthanolic fraction of theR. manglebark extract (RM) against experimental gastric ulcer in rats. Unib-Wh rats received pretreatment ofR. mangleafter the induction of gastric injury with absolute ethanol and ischemia-reperfusion. Gastric tissues from both methods were prepared to the enzymatic assays, the levels of sulfhydril compounds (GSH), lipid peroxides (LPO), and the activities of glutathione reductase (GR), glutathione peroxidase (GPx), superoxide dismutase (SOD) and myeloperoxidase (MPO) were measured. The RM protected the gastric mucosa in both methods used, ethanol-induced gastric ulcer and ischemia-reperfusion, probably, by modulating the activities of the enzymes SOD, GPx, and GR and increasing or maintaining the levels of GSH; in adittion, LPO levels were reduced. The results suggest that the RM antioxidant activity leads to tissue protection; thus one of the antiulcer mechanisms present on the pharmacological effects ofR. mangleis the antioxidant property.

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Production of a Natural Antioxidant from Pinus radiata Bark

Journal of Biotechnology ◽

10.1016/j.jbiotec.2010.09.245 ◽

2010 ◽

Vol 150 ◽

pp. 295-295

Author(s):

Valentina Ramos ◽

Verónica Sanhueza ◽

Estrella Aspé ◽

Marlene Roeckel ◽

Katherina Fernández

Keyword(s):

Pinus Radiata ◽

Natural Antioxidant ◽

Pinus Radiata Bark

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Polyphenolic Extractives of Pinus radiata Bark

Holzforschung ◽

10.1515/hfsg.1977.31.1.20 ◽

1977 ◽

Vol 31 (1) ◽

pp. 20-25 ◽

Cited By ~ 44

Author(s):

Y. Yazaki ◽

W. E. Hillis

Keyword(s):

Pinus Radiata ◽

Pinus Radiata Bark

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Retention and plant availability of chromium in soils as affected by lime and organic matter amendments

Soil Research ◽

10.1071/sr00090 ◽

2001 ◽

Vol 39 (5) ◽

pp. 1091 ◽

Cited By ~ 30

Author(s):

N. S. Bolan ◽

S. Thiagarajan

Keyword(s):

Organic Matter ◽

Pinus Radiata ◽

Contaminated Soils ◽

Opposite Effect ◽

Organic Amendment ◽

Column Experiments ◽

Fluidised Bed ◽

Tannery Industry ◽

Cr Concentration ◽

Pinus Radiata Bark

Chromium is used as Cr(III) in the tannery industry and as Cr(VI) in the timber treatment industry. In this experiment, the effect of 2 liming materials [fluidised bed boiler ash (FBA) and lime] and an organic amendment (Pinus radiata bark) on the retention of Cr by 2 soils (Egmont and Tokomaru) was examined using both ‘batch’ and ‘column’ experiments. The effect of these amendments on the uptake of Cr from the Egmont soil, treated with various levels of Cr (0–3200 mg Cr/kg soil), was examined using sunflower (Helianthus annuus) plants. The transformation of Cr was examined by fractionation of Cr in soils. Addition of FBA and lime increased the retention of Cr(III), but had the opposite effect on the retention of Cr(VI). Addition of bark did not affect the retention of Cr(III), but it increased the retention of Cr(VI). Increasing additions of Cr increased Cr concentration in plants, resulting in decreased plant growth. The liming materials were found to be effective in reducing the phytotoxicity of Cr(III) and the Pinus radiata bark was effective for Cr(VI). In both Cr(III)- and Cr(VI)-contaminated soils, the concentrations of Cr were higher in the organic-bound, oxide-bound, and residual fractions than in the soluble and the exchangeable fractions. The concentrations of Cr in the soluble and the exchangeable fractions were higher in the Cr(VI)-contaminated than the Cr(III)-contaminated soil. Addition of the liming materials decreased the concentration of the soluble Cr(III) and bark decreased soluble Cr(VI) in soil. There was evidence for the reduction of Cr(VI) to Cr(III) in the bark-treated soils.

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