Analysis of phenolic compounds including tannins, gallotannins and flavanols of Uapaca kirkiana fruit

Muchuweti, Maud; Ndhlala, Ashrrell R.; Kasiamhuru, A.

doi:10.1016/j.foodchem.2004.11.030

Cited by 26 publications

(25 citation statements)

References 8 publications

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“…Artobotrys brachypetalus and S. cordatum fruits rather have sweet tastes, suggesting more sugars compared with X. caffra fruits. There are more phenolics in embryos and peels of Uapaca kirkiana fruit (Muchuweti et al. , 2006).…”

Section: Resultsmentioning

confidence: 99%

Phenolic content and profiles of selected wild fruits of Zimbabwe: Ximenia caffra, Artobotrys brachypetalus and Syzygium cordatum

Ndhlala

Muchuweti

Mupure

et al. 2008

Int J of Food Sci Tech

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SummaryThe phenolic compound content and profiles of three wild fruits found in Zimbabwe were tentatively identified using the traditional colorimetric methods and high-performance liquid chromatography (HPLC). The fruits assayed were: Ximenia caffra, Artobotrys brachypetalus and Syzygium cordatum. Ximenia caffra fruit peels contained the highest amounts of total phenolics amounting to 1205 lg g)1 in fresh weight, flavonols amounting to 27 lg g )1 and phenolic acids on HPLC tentative identification showed higher concentrations compared with the profiles of the other fruits. Syzygium cordatum fruit peels contained the least amounts of phenolics amounting to 20 lg g)1, flavonols amounting to 8 lg g )1 and phenolic acids' HPLC profiles showed low concentrations. Comparing the peels and pulps of all the fruits, we detected more total phenolics in the peels of X. caffra as high as 1205 lg g )1 and the pulps had 228 lg g)1, more flavonols and phenolic acids while the peels of S. cordatum fruits contained the least with a total phenolic acid content of 20 lg g )1, and had more flavonols in the pulps than the peels, 11 lg g)1 and 8 lg g)1, respectively. Ximenia caffra contained 1.2% and about 1% dry weight condensed tannins in peels and pulps, respectively. In S. cordatum we detected 0.2% and 0.3% dry weight condensed tannins in the peels and pulps, respectively.

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Section: Resultsmentioning

confidence: 99%

Phenolic content and profiles of selected wild fruits of Zimbabwe: Ximenia caffra, Artobotrys brachypetalus and Syzygium cordatum

Ndhlala

Muchuweti

Mupure

et al. 2008

Int J of Food Sci Tech

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“…However, brown fruits were preferred to yellow fruits, a preference that may be related to higher sugar contents in browner fruits at harvest (Kadzere et al 2006b). The causes of astringency in U. kirkiana are not known, but probably reflect high tannin contents (Muchuweti et al 2006). Sensory studies such as those developed in a study of Dacryodes edulis (Kengni et al 2001) could better identify taste attributes in U. kirkiana and aid genetic selection and evaluate the effects of postharvest treatments.…”

Section: Discussionmentioning

confidence: 99%

Harvesting and postharvest handling practices and characteristics of Uapaca kirkiana (Muell. Arg.) fruits: a survey of roadside markets in Malawi

et al. 2006

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Uapaca kirkiana (Muell. Arg.), a highly valued indigenous fruit species, is being domesticated to increase its utilization in southern Africa. Vendors, who were also the fruit gatherers, that were selling U. kirkiana fruits at roadside markets in Dedza, Malawi, were interviewed on four occasions during the marketing season (October 2003-January 2004) and fruit samples were concurrently sampled from each vendor. Information was obtained on when and how the fruits had been harvested and handled. Timing of fruit harvest was based on experience, aided by indicators such as occurrence of first heavy rains, natural abscission, size and color changes. Harvesting by knocking down unripe fruits from trees was practiced throughout the season, but naturally abscised fruits were also gathered in December and January. Fruits harvested when mature but unripe required incubation in soil, plain and woven plastic bags or clay-pots. The incubation method changed and the duration of incubation decreased between October (3-4 days) and January (£2 days). Fruit samples were evaluated for damage, color and soluble solids concentration (SSC). Fruit SSC and color lightness/brightness (L*) increased from 10.1 to 16.4% (P < 0.01) and from 45.7 to 50.5 units, (P < 0.01), respectively. Higher SSC values were generally associated (R 2 =0.68, P < 0.001) with increasing pulp color intensity. Cracking, at 48%, constituted the most common form of damage in sampled fruits. On average, fruits were saleable for only 3-4 days, this being attributed to inherent fruit characteristics combined with immaturity at harvest, and damage during harvesting and storage in hot dry conditions. Lack of appropriate harvesting and handling techniques were associated with fruit darkening, drying, rotting and other postharvest problems.

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“…After freeze-drying, the WBMs were ground to a powder and stored at -20°C. Total polyphenol content was determined according to the method of Muchuweti et al 5 The 1,1-diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assays described by Hayes et al 6 were used to determine the antioxidant activity of WBMs.…”

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confidence: 99%

Agaricus bisporusAttenuates Dextran Sulfate Sodium-Induced Colitis

Park²,

Gwon³

et al. 2014

Journal of Medicinal Food

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Agaricus bisporus (white button mushroom, WBM) is widely consumed in most countries and is reported to have anti-inflammatory and antioxidant activities. However, little is known regarding its effects in dextran sulfate sodium (DSS)-induced colitis, which are related to dysfunction of intestinal immunity. The aim of the present study was to investigate the effects of WBMs in an animal model of DSS-induced colitis. Male, 4-week-old ICR mice (n=10 per group) were fed a normal diet with or without 10% WBM for 4 weeks, and colitis was induced by 3% DSS in drinking water for 7 days. WBMs prevented DSS-induced shortening of colon length (P=.033) and diminished diarrhea (P=.049) and gross bleeding (P=.001), resulting in a decreased disease activity index. Results of histological analysis showed that WBMs suppressed mucosal damage. In addition, WBMs attenuated the DSS-induced increase in myeloperoxidase activity (P=.012) and upregulation of proinflammatory cytokine tumor necrosis factor-α (P=.020) in the colon segment. Taken together, these findings suggest a possible role for the WBM as an immunomodulator that can prevent and/or treat ulcerative colitis.

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Analysis of phenolic compounds including tannins, gallotannins and flavanols of Uapaca kirkiana fruit

Cited by 26 publications

References 8 publications

Phenolic content and profiles of selected wild fruits of Zimbabwe: Ximenia caffra, Artobotrys brachypetalus and Syzygium cordatum

Phenolic content and profiles of selected wild fruits of Zimbabwe: Ximenia caffra, Artobotrys brachypetalus and Syzygium cordatum

Harvesting and postharvest handling practices and characteristics of Uapaca kirkiana (Muell. Arg.) fruits: a survey of roadside markets in Malawi

Agaricus bisporusAttenuates Dextran Sulfate Sodium-Induced Colitis

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