G. Negri

Publications88
h-index23
Citations2,414
Highly Influential Citations103
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Traditional uses, chemistry and pharmacology of Croton species (Euphorbiaceae)
Croton is a genus of Euphorbiaceae comprising around 1,300 species, widespread in tropical regions of the Old and New Worlds. Several species have a long role in the traditional use of medicinal… Expand
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Brazilian red propolis: unreported substances, antioxidant and antimicrobial activities.
BACKGROUND Chloroform, ethyl acetate and methanol extracts of a sample of red propolis from the state of Alagoas (northeast Brazil) were analyzed by gas chromatography-mass spectrometry and… Expand
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Seasonal Variation, Chemical Composition and Antioxidant activity of Brazilian Propolis Samples
Total phenolic contents, antioxidant activity and chemical composition of propolis samples from three localities of Minas Gerais state (southeast Brazil) were determined. Total phenolic contents were… Expand
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Hydroxycinnamic acid amide derivatives, phenolic compounds and antioxidant activities of extracts of pollen samples from Southeast Brazil.
Seven bee pollen samples (C1-C7) with different palynological sources were harvested from Pindamonhangaba municipality (Southeast Brazil). Methanol extracts of untreated samples (control), samples… Expand
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Origin and Chemical Variation of Brazilian Propolis
Propolis is a hive product containing chiefly beeswax and plant-derived substances such as resin and volatile compounds. Propolis has been used as an antiseptic and wound healer since ancient times… Expand
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Plant Origin of Green Propolis: Bee Behavior, Plant Anatomy and Chemistry
Propolis, a honeybee product, has gained popularity as a food and alternative medicine. Its constituents have been shown to exert pharmacological effects, such as anti-microbial, anti-inflammatory… Expand
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Diabetes melito: plantas e princípios ativos naturais hipoglicemiantes
O diabetes melito e considerada como uma sindrome que e, quanto a etiologia e patogenese, caracterizada por alterar a homeostase do organismo, por disturbios metabolicos complexos e primarios dos… Expand
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Antinociceptive peripheral effect of Achillea millefolium L. and Artemisia vulgaris L.: both plants known popularly by brand names of analgesic drugs
The hydroalcohol extracts of Achillea millefolium L. (AM) and Artemisia vulgaris L. (AV), both belonging to the Asteraceae family, were evaluated by the hot plate, writhing, formalin and intestinal… Expand
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Antiproliferative and antioxidant activities of a tricin acylated glycoside from sugarcane (Saccharum officinarum) juice.
From sugarcane juice, a flavone, identified by spectroscopic methods as tricin-7-O-beta-(6''-methoxycinnamic)-glucoside, was isolated, in addition to orientin. The tricin derivative was shown to have… Expand
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A new type of Brazilian propolis: Prenylated benzophenones in propolis from Amazon and effects against cariogenic bacteria
Abstract Ethanol extracts of four propolis samples (E1–E4) from Manaus (Brazilian Amazon) were analysed by HPLC/DAD/ESI–MS/MS and GC/EIMS. The major constituents of E2 and E4 were analysed by NMR (1H… Expand
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