Effects of Condensed Tannins on the Toxicity of Fireweed

Fireweed (Senecio madagascariensis) is a noxious and invasive weed affecting pastures in Hawaii Australia and South America Fireweed contains compounds called pyrrolizidine alkaloids that are toxic to most grazing mammals Toxic effects to cattle include irreversible damage to liver cells hardening of the liver and loss of liver function which may lead to jaundice swelling and the

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proanthocyanidins or condensed tannins Archives

Proanthocyanidins or condensed tannins also called pycnogenols and leukocyanidins are polyphenolic compounds (in particular they are a flavonoid subgroup) widely distributed in the plant kingdom second only to lignin as the most abundant phenol in nature They are present in high concentrations in various parts of the plants such as flowers fruits berries seeds (e g in grape seeds) and

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Uses of tannins and tannosomes

In their condensed secondary-metabolite form tannins are highly toxic and insoluble compounds and they bind to proteins and enzymes As such in nature tannins are essential products for plant defense and they provide plants with a chemical mechanism with which to combat pathogens and herbivores Because tannins are so bitter most herbivorous predators are disinclined to consume them

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Tannins

Tannins 1 Vandana Kaur 14BPH1060 6th Sem 2 Introduction Tannins are polyphenolic substances found in many plants product of secondary metabolism Its water- soluble nature allows easy extraction and is useful in various applications in the chemical and pharmaceutical industry Definition-the complex organic non- nitrogenous polyphenolic substances of higher molecular weight They are used

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Condensed tannins: Quinone methide intermediates in

Condensed tannins: Quinone methide intermediates in procyanidin synthesis Journal of The Chemical Society Chemical Communications p 1035-1036 Posted Date: April 1 1980 Modified Date: August 22 2006 Print Publications Are No Longer Available In an ongoing effort to be fiscally responsible the Southern Research Station (SRS) will no longer produce and distribute hard copies of our

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Condensed Tannins from Ficus virens as Tyrosinase

Condensed Tannins from Ficus virens as Tyrosinase Inhibitors: Structure Inhibitory Activity and Molecular Mechanism PLOS ONE Dec 2019 Xiao-Xin Chen Yan Shi Wei-Ming Chai Hui-Ling Feng Jiang-Xing Zhuang Qing-Xi Chen Xiao-Xin Chen Yan Shi Wei-Ming Chai Hui-Ling Feng

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Effects of Condensed Tannins on the Toxicity of Fireweed

Condensed tannins which are common in many forage legumes bind with other molecules such as protein and alkaloids Complementarities among secondary compounds such as condensed tannins and alkaloids can allow animals to consume more of plant material they would otherwise avoid due to toxicity however there is very little information on whether tannins actually protect animals from the

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Plants and secondary metabolites (Tannins): A Review

Tannins are divided into two main groups according to their chemical structure and properties: hydrolysable (HT) and condensed tannins (CT) Hydrolysable tannins are usually found in lower concentrations in plants than CTs Condensed tannins consist of flavanoid units (flavan-3-ol) linked by carbon-carbon bonds They are found in many plant species such as Acacia spp Sericea lespedeza

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Analytical approach and effects of condensed tannins in

Analytical approach and effects of condensed tannins in carob pods (Ceratonia siliqua) on feed intake digestive and metabolic responses of kids Nissim Silanikove a * Serge Landau b Diti Or b Dorit Kababya c Israel Bruckental a Zafrira Nitsan a aInstitute of Animal Science Agricultural Research Organization Bet-Dagan 50250 Israel bInstitute of Field and Garden Crops Agricultural

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Occurrence of Condensed Tannins in Wheat and Feasibility

condensed tannins and other secondary metabolites has just begun Considerable eff ort is being undertaken to manipulate the biochemical pathway regulating con-densed tannins in alfalfa (Medicago sativa L ) and other legumes to make them bloat-safe improve their nitrogen use by ruminants and improve their feed value (Robbins

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Effect of condensed tannins from birdsfoot trefoil on

Mycelia of fungi grown with condensed tannins were covered by filamentous material which may have arisen from the formation of condensed tannin–protein complexes Less than 86% of the condensed tannins (as measured by the H 2 SO 4 method) were recovered after 120 h of incubation with N frontalis RE1 P communis 22 and N patriciarum 27

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Use of Tannins as Organic Protectants of Proteins in

Condensed tannins are polymers of flavan-3-ol (e g catechin) or flavan-3 4-diol (proanthocyanidins) linked by C–C or C–O–C bonds to yield compounds of varying molecular weight (Leinmuller et al 1991) Condensed tannins are synthesised from precursors from the acetate and shikimic acid pathways as is lignin The anabolic pathway was described in detail by Waterman and Mole (1994

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Condensed tannins from steamed Acacia mearnsii bark

Condensed tannins from steamed Acacia mearnsii bark Duan Wengui Ohara Seiji Hashida Koh Makino Rei 2005-05-01 00:00:00 The optimum steaming conditions for extraction of condensed tannins from Acacia mearnsii bark were explored after which characterization of proanthocyanidins from bark steamed under optimum conditions was carried out The optimum conditions were as follows:

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The Gastroprotective Effects of Eugenia dysenterica

Tannins are present in the extract which was analyzed by matrix assisted laser desorption/ionization (MALDI) the tannins identified by fragmentation pattern (MS/MS) were condensed type-B coupled up to eleven flavan-3-ol units and were predominantly procyanidin and prodelphinidin units Partial removal of tannins from the extract abolished the cytoprotective actions of the extract The

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Condensed tannins from steamed Acacia mearnsii bark

Condensed tannins from steamed Acacia mearnsii bark Duan Wengui Ohara Seiji Hashida Koh Makino Rei 2005-05-01 00:00:00 The optimum steaming conditions for extraction of condensed tannins from Acacia mearnsii bark were explored after which characterization of proanthocyanidins from bark steamed under optimum conditions was carried out The optimum conditions were as follows:

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Chemistry and significance of condensed tannins (Book

Chemistry and significance of condensed tannins New York : Plenum Press 1989 (OCoLC)645900320: Material Type: Conference publication: Document Type: Book: All Authors / Contributors: Richard W Hemingway Joseph J Karchesy Susan J Branham

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Tannins in wine

The condensed tannins also known as proanthocyanidins are the main grape-derived tannins They are formed by the polymerization of the polyphenolic flavan-3-ol monomers catechin and epicatechin These subunits form chains of varying length referred to by the unit 'dp' (for degree of polymerisation i e the number of flavan-3-ol subunits) The main variables in the characteristics of

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Differential effects of condensed and hydrolyzable tannin

1991a) Hydrolyzable tannins have been shown to inhibit the growth of an attine fungus (Seaman 1984) and condensed tannins appear to be even more inhib- itory (Cherrett et al 1989) This result is consistent with the observation that condensed tannins are very effective inhibitors of

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Tannins in Tea

Tannins are a class of compounds in tea especially black tea which tend to have a bitter flavor and astringent properties Teas high in tannins can be described as tannic Tannins are naturally occurring and common and are an important component of red wine They are also responsible for the dark color in some streams as they are found in leaves and wood and are released as organic matter

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CONDENSED TANNINS OF RAPESEED MEAL Journal of

ABSTRACT The study was undertaken to determine the amount and nature of condensed tannins in rapeseed meal No condensed tannins were found in rapeseed meats (endosperm plus germ) The hulls however yielded 0 1% condensed tannins by 70% aqueous acetone extraction the bulk of the condensed tannins in the hulls being unextractable by the extractants used The basic unit of the

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CONDENSED TANNINS OF RAPESEED MEAL Journal of

CONDENSED TANNINS OF RAPESEED MEAL LEUNG J FENTON T W MUELLER M M CLANDININ O R 1979-09-01 00:00:00 OF RAPESEED MEAL T W FENTON M M MUELLER and 0 R CLANDININ ABSTRACT The study was undertaken to determine the amount and nature of condensed tannins in rapeseed meal No condensed tannins were found in rapeseed meats

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