concept

Tannins

Also known as: Tannin, tannin

Facts (48)

Sources
Active Plant Principles and Applications in Plant Medicine irispublishers.com Daniela Rebeca Ardelean, Ramona Stef, Monica Butnariu · Iris Publishers May 2, 2024 11 facts
claimSalicis cortex (willow bark) is harvested from various willow species, including Salix alba, S. capreea, S. fragilis, and S. purpurea, and derives its tonic, astringent, anti-inflammatory, and antipyretic properties from its tannin content.
claimQuercus cortex (oak bark), derived primarily from Quercus robur and Quercus sessiliflora (syn. Q. petraea), contains tannins as active principles.
claimAcorns (Quercus semen) contain tannin and starch and are used in ground form as flour to treat diarrhea in children.
claimRosae petalum (petals or flowers of wild rose or rose hip species) are used as an astringent or antiseptic due to the presence of tannins and anthocyanins.
claimTannins are widespread throughout the plant kingdom, with all plants producing them to varying degrees as a defense mechanism against external aggressions by making bark and leaves bitter and unfit for consumption by insects or animals.
claimThe Chinese tea plant Camellia sinensis contains caffeine in the same proportions as coffee (Coffea arabica), but the tea contains more tannin, which provides an astringent and acidic taste and inhibits the absorption of caffeine into the blood.
claimTannins are nitrogen-free vegetable substances belonging to the class of polyphenones that are generally amorphous, water-soluble, and capable of forming impermeable and putrefactive compounds with proteins.
claimGallic acid is the most widespread constituent found within the composition of tannins.
measurementHyperici herba, which represents the aerial part and flowering seeds of St. John’s wort (Hypericum perforatum), contains between 13% and 17% tannins in the dry plant product.
claimTherapeutically, tannins are utilized as astringents, hemostatics, and antidiarrheals, though they may act as laxatives or emetics when administered in large doses.
measurementSalix alba (white willow) contains up to 10% tannin, which is primarily of a Gallic nature.
Vernonia amygdalina: a comprehensive review of the ... frontiersin.org Frontiers 11 facts
measurementVernonia amygdalina contains 305 mg/g of flavonoids, 104 mg/g of phytate, 6 mg/g of saponin, 1.7 mg/mL of tannin, and 20 mg/mL of alkaloids.
measurementThe ethanol extract of Vernonia amygdalina contains 99 mg/g of tannins, 70 mg/g of flavonoids, 64 mg/g of saponins, 36 mg/g of phenols, and 32 mg/g of alkaloids.
claimThe bitter taste of Vernonia amygdalina is caused by secondary metabolites, including saponins, tannins, alkaloids, and glycosides, which act as anti-dietary components.
claimPhytochemicals found in Vernonia amygdalina—specifically alkaloids, flavonoids, terpenoids, phenolics, and tannins—exhibit biological activities including antimicrobial effects, antioxidant properties, disease prevention and therapy, free radical scavenging, anticancer activity, and antiviral potential.
claimPhytochemical screening of ethanol and aqueous leaf extracts of Vernonia amygdalina revealed the presence of flavonoids, alkaloids, saponins, tannins, triterpenoids, steroids, and cardiac glycosides.
claimChemical analysis of Vernonia amygdalina reveals the presence of flavonoids, alkaloids, saponins, tannins, triterpenoids, sesquiterpene lactones, steroids, cardiac glycosides, oxalates, phytates, cyanogenic glycosides, and phenols.
claimVernonia amygdalina contains numerous phytochemicals including alkaloids, glycosides, sesquiterpene lactones, steroids, flavonoids, proanthocyanidins, tannins, terpenoids, phenylpropanoids, resins, lignans, furocoumarines, naphthodianthrones, proteins, and peptides.
claimAbrading Vernonia amygdalina leaves significantly decreases nutrient and antinutrient (phytate and tannin) levels, causes a large decrease in proximate and mineral composition, increases magnesium content, and results in no significant change to carbohydrate content.
measurementThe aqueous leaf extract of Vernonia amygdalina contains 27 mg/g of saponins, 46 mg/g of alkaloids, 122 mg/g of flavonoids, 17 mg/g of terpenoids, 12 mg/g of tannins, 48 mg/g of steroids, and 36 mg/g of phenols.
procedureBlanching and abrasion are methods used to reduce anti-nutritional components such as tannin and phytate in Vernonia amygdalina leaves, according to Yakubu et al. (2012).
claimOvernight soaking, blanching, and abrasion significantly reduce the mineral, tannin, and phytate contents of Vernonia amygdalina.
Medicinal plants: bioactive compounds, biological activities ... frontiersin.org Frontiers in Immunology 6 facts
referenceAristri MA, Lubis MAR, Iswanto AH, Fatriasari W, Sari RK, Antov P, et al. authored 'Bio-based polyurethane resins derived from tannin: Source, synthesis, characterisation, and application' published in Forests in 2021.
claimPolyphenols are categorized into four distinct groups: phenolic acids, flavonoids, tannins, and stilbenes.
claimPolyphenols and tannins disrupt quorum sensing, which is a critical communication mechanism for biofilm development.
claimMedicinal plants contain diverse bioactive chemicals including coumarins, flavonoids, phenolics, alkaloids, terpenoids, tannins, essential oils, lectins, polypeptides, and polyacetylenes.
claimAristri et al. reported that the antibacterial properties of tannins are linked to the cleavage of the ester linkage between gallic acid and polyols.
claimTannins are distributed in various plant parts and serve as a natural defense against microbial invasion, exhibiting antibacterial effects against fungi, yeasts, bacteria, and viruses.
Nutritional potential of underutilized edible plant species in coffee ... link.springer.com Springer Apr 23, 2021 6 facts
referenceChung, Wong, Wei, Huang, and Lin (1998) reviewed the relationship between tannins and human health.
measurementOut of 12 species analyzed, 5 species showed no detected tannins, while the other 7 species had tannin content varying from 3.15 mg/g edible portion (Triumfetta mauritianum) to 3.97 mg/g fresh edible portion (Syzygium guineense).
measurementTannin content was highest in the fruits of Syzygium guineense (3.97 mg/100 g fresh edible portion) followed by Ficus sycomorus (1.96 mg/g fresh edible portion).
claimLow tannin values in the study might be a consequence of freezing, as long freezing periods have been reported to reduce tannin content in some vegetables by Aregahegn et al. (2013).
claimCooking green vegetables and tubers reduces the levels of phytates, tannins, and oxalates.
claimTannins reduce the nutritional value of foods by interacting with proteins, starch, and digestive enzymes, as noted by Chung et al. (1998).
Medicinal plants and human health: a comprehensive review of ... link.springer.com Springer Nov 5, 2025 5 facts
claimTannins derived from green tea (Camellia sinensis) adhere to bacterial proteins and interfere with biological activities.
referenceHassan (2025) published a study in the International Journal of Molecular Sciences on the mechanistic perspectives of Herpes simplex virus inhibition by phenolic acids and tannins, specifically regarding interference with the virus life cycle.
claimTannins and proanthocyanidins possess antiviral properties by binding to viral envelope proteins, which obstructs early cellular attachment and membrane fusion.
claimMedicinal plants contain primary and secondary metabolites categorized as bioactive compounds, including alkaloids, steroids, tannins, phenolic compounds, and flavonoids, which can elicit physiological effects on the human body.
claimTannins and proanthocyanidins exhibit broad-spectrum efficacy against enveloped viruses by inducing steric hindrance and conformational alterations of viral surface proteins through hydrogen bonding and hydrophobic interactions with viral glycoproteins.
Phytochemical and Pharmacological Studies of Traditionally Used ... heraldopenaccess.us Journal of Food Science & Nutrition 3 facts
claimOcimum basilicum Linn. contains secondary metabolites including essential oils, phenols, flavonoids, anthocyanins, tannins, and steroids, along with minerals such as Fe, Ca, Mg, P, Mn, Na, K, and Zn.
claimHerbal plant infusions available as ready-to-serve drinks, instant tea, or squashes possess antidiabetic properties due to the presence of functional ingredients including phenols, flavonoids, tannins, alkaloids, and essential oils, which increase sugar metabolism by stimulating insulin secretion and maximizing sugar excretion through renal diuresis.
claimPreliminary phytochemical analysis indicates that Ocimum basilicum Linn. contains terpenoids, alkaloids, phenolics, flavonoids, tannins, saponin, reducing sugars, cardiac glycosides, steroids, and glycosides.
Investigation of nutritional and phytochemical properties of wild ... nature.com Nature Dec 9, 2025 2 facts
claimSecondary phytochemical screening identifies bioactive compounds such as alkaloids, flavonoids, phenols, saponins, and tannins, which are responsible for the therapeutic efficacy of plants.
claimPlants contain phytochemicals such as alkaloids, flavonoids, phenols, saponins, and tannins, which often exhibit antioxidant, antimicrobial, and anti-inflammatory properties.
Ethnobotanical and Food Composition Monographs of Selected ... ouci.dntb.gov.ua Javier Tardío, María de Cortes Sánchez-Mata, Ramón Morales, María Molina, Patricia García-Herrera, Patricia Morales, Carmen Díez-Marqués, Virginia Fernández-Ruiz, Montaña Cámara, Manuel Pardo-de-Santayana, María Cruz Matallana-González, Brígida María Ruiz-Rodríguez, Daniel Sánchez-Mata 1 fact
measurementThe seeds of Ziziphus lotus contain significantly higher levels of protein (8.37 to 27.75%), lipid (35.39 to 48.01%), potassium (125.874 to 325.408 mg. 100−1 g), polyphenol (439.465 to 1349.46 mg.GAE.100 g−1), flavonoid (83.908 to 98.259 mg.QE.100 g−1), tannins (55.268 to 277.94 mg.GAE.100 g−1), and chlorophyll b (11.2 to 30.4 μg g−1) compared to the fruit pulp.
Medicinal plants meet modern biodiversity science - OUCI ouci.dntb.gov.ua Charles C. Davis, Patrick Choisy · Elsevier BV 1 fact
claimPhytochemical analysis of Dichrostachys cinerea confirms the presence of biologically active compounds including flavonoids, polyphenols, alkaloids, saponins, terpenoids, and tannins.
Pharmacological Uses of New Bioactive Compounds from Medicinal ... academia.edu International Academic Publishing House 1 fact
claimSecondary metabolites found in medicinal plants, including flavonoids, tannins, phenolic acids, terpenoids, alkaloids, coumarins, essential oils, and polypeptides, possess antibacterial, anti-inflammatory, antioxidant, anti-cancer, neuroprotective, and immunomodulatory properties.
Pharmacological Uses of New Bioactive Compounds from Medicinal ... ouci.dntb.gov.ua Bhanumati Sarkar, Paramita Biswas, Suman Adhikari · International Academic Publishing House (IAPH) 1 fact
claimProminent bioactive compounds found in medicinal plants include flavonoids, tannins, phenolic acids, terpenoids, alkaloids, coumarins, essential oils, and polypeptides.