Phytochemical investigation and antimicrobial activity of Psidium guajava L. leaves

Metwally, Aly M.; Omar, Abeer; Harraz, Fathalla M.; Sohafy, Samah M. El

doi:10.4103/0973-1296.66939

Cited by 130 publications

(67 citation statements)

References 11 publications

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“…In previous studies methanolic extracts suppressed the growth of S. aureus and E. coli (Doughari and Manzara, 2008). Ethanol extracts isolated flavonoid compounds that were effective against S. aureus and E. coli (Metwally, 2010). Contrary results on the activity of methanolic leaf extracts was reported by (Gaidem et al, 2010) where by the extracts had no effect on the growth E. coli, S. aureus and S. fecalis .…”

Section: Discussionmentioning

confidence: 99%

Bioactivity determination of methanol and water extracts for roots and leaves of Kenyan Psidium guajava L landraces against pathogenic bacteria

2013

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Guava (Psidium guajava L) is native to South America and exists as both wild and cultivated. Guava has been used as a source of food and raw materials for pharmaceuticals. The aim of this study was to determine bioactivity of methanol and water extracts from root and leaves of Kenyan guava landraces against selected pathogenic bacteria. Study samples were collected from Western and South Coast of Kenya. One hundred grams of leaf and root ground powders were used for sequential extraction using methanol and water. Extracts were evaporated and 0.2gms dissolved using the extraction solvent and tested against gram positive (Staphylococcus aureus, Bacillus subtilis) and negative bacteria (Escherichia coli). Data on inhibition zone was taken in mm and analyzed at 95% confidence interval. Extracts from Western region had significant inhibition compared to Coastal region. The two regions have different climatic conditions that result in these plants having different compounds even though they are the same species. Roots had higher inhibition compared to the leaves as they contain high levels of tannins compared to leaves. Water as an extracting solvent had higher inhibition than methanol as it is more polar and it absorbs more bioactive compounds. S. aureus was most inhibited followed by E. coli and B. subtilis respectively. There was no significant difference between the gram positive and negative bacteria. Remarkably, some methanol and water root extracts had significant inhibition against bacteria when compared to some commercial antibiotics used. Results of this study indicate that Kenyan guava roots from Western Kenya extracted with methanol and water have a potential to be used as a source of active compounds in treatment of gram positive and gram negative bacteria pathogens.

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Section: Discussionmentioning

confidence: 99%

Bioactivity determination of methanol and water extracts for roots and leaves of Kenyan Psidium guajava L landraces against pathogenic bacteria

2013

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“…In addition, this could help determine whether the previously reported low IVOMD (Adrian et al 2012) has an impact on mineral absorption. The lack of nutrient availability and compromise of animal health could increase due to the presence of antimicrobial factors (Metwally et al 2010), resulting in limited digestibility of pasture grasses (Adrian et al 2012). Researchers in India looked at twenty-four crossbred (Large White Yorkshire × Desi) male pigs and found that adding sun-dried guava pomace (up to 30 percent) to their diets did not significantly affect growth and carcass characteristics (Madhava et al 2004).…”

Section: Correlations Of Macrominerals Between Guava and Soilmentioning

confidence: 98%

Mineral Composition and Soil-Plant Relationships for Common Guava (Psidium guajavaL.) and Yellow Strawberry Guava (Psidium cattleianumvar. lucidum) Tree Parts and Fruits

Adrian

Arancon

Mathews

et al. 2015

Communications in Soil Science and Plant Analysis

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The mineral compositions of the fruit and tree parts of common guava, Psidium guajava L., and strawberry guava, Psidium cattleianum var. lucidum, were determined. The study occurred during three seasons at six locations in Hawaii to assess guava as feed for livestock. Guava bark contained the greatest concentrations of calcium (Ca) and ash; leaves the greatest concentrations of magnesium (Mg), sulfur (S), sodium (Na), boron (B), and manganese (Mn); and the shoots had the greatest concentrations of nitrogen (N), phosphorus (P), and potassium (K). The leaves and the shoots had the greatest concentrations of copper (Cu) and iron (Fe). Between guava and waiwi, guava had greater concentrations of most minerals except for Na in all plant parts, and Mg and ash in the leaves. Guava leaves and shoots meet the macromineral requirements for various phases of sheep, goat, and beef cattle life cycles with the exception of P and Na. Guava shoots do not meet Mn requirements for lactating cows.

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“…Muller Hinton agar (MHA) plates were prepared by pouring 15 ml of molten media into sterile petriplates [20][21][22]. The fresh grown bacteria were suspended in sterile saline to achieve concentration of 10 7 CFU/ml.…”

Section: Antimicrobial Susceptibility Testmentioning

confidence: 99%

Antimicrobial and Anti-Inflammatory Activity of Press Cake of Jatropha curcas

Tripathi¹,

Sharma²

2016

Appli Micro Open Access

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Several compounds present in fruits as Polyphenol, are able to kill or inhibit the growth of microorganisms. These properties are relevant mainly in tropical areas, as Amazonian region where infectious are highly prevalent. Therefore, this study investigated the antimicrobial activity of Jatropha curcas seed cake against microorganisms. The results showed antibacterial effect of Jatropha curcas seed cake methanolic extracts on two Gram-positive bacteria and Gram-negative bacteria. Effect of Jatropha curcas seed cake on Superoxide and nitric oxide production was also estimated in macrophage cells. This result suggests its anti-inflammatory and antibacterial potential of the herb, which could be due to the bio-active principles which are anti-inflammatory and antibacterial in nature. The present study, therefore emphasizes the use of Jatropha curcas seeds as an anti-inflammatory and antibacterial drug against macrophage cells and bacteria respectively.

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Phytochemical investigation and antimicrobial activity of Psidium guajava L. leaves

Cited by 130 publications

References 11 publications

Bioactivity determination of methanol and water extracts for roots and leaves of Kenyan Psidium guajava L landraces against pathogenic bacteria

Bioactivity determination of methanol and water extracts for roots and leaves of Kenyan Psidium guajava L landraces against pathogenic bacteria

Mineral Composition and Soil-Plant Relationships for Common Guava (Psidium guajavaL.) and Yellow Strawberry Guava (Psidium cattleianumvar. lucidum) Tree Parts and Fruits

Antimicrobial and Anti-Inflammatory Activity of Press Cake of Jatropha curcas

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