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Showing 1 to 20 of 104 for “"Tannin"”.
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Tannin content of certain California oaks
… three California oaks as possible sources of tannin. Even though the study of the three varieties of tree may not be representative samples, the procedures developed may prove to be valuable in a more extensive research by other workers.
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Tannin content of English walnuts : thesis ...
… depend from the most part on the use of natural tannin extracts. During the year, 1952, the amount of natural tannin extracts used by the leather industry was 560,452,119 pounds as compared to 35,793,000 pounds of synthetic tanning materials. It is not as yet possible to produce synthetic …
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The nature of a constituent of quebracho tannin.
Tanning is defined as a process of skin treatment whereby the hot water shrinkage point of the skin is raised, the fibres of the skin substance are prevented from mutually adhering on drying, and the skin substance is protected from putrefaction under ordinary conditions in air. There are various …
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Re-strengthening demineralized bone via tannin-iron crosslinking
… the disease are needed now more than ever. Using tannin iron complexes we show that thin film deposition of the complexes are not only possible but effective at strengthening demineralized bone. Furthermore we show that by taking advantage of newly discovered tris-complexes that are able to form …
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Tannin geochemistry of natural systems: method development and application
Polyphenolic tannin comprises a significant proportion of the leaves, needles, and barks of vascular plant tissues---all major contributors to terrigenous organic matter cycling in aquatic systems. However, virtually nothing is known at the molecular level about tannin diagenesis despite the …
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The separation of the insoluble non-tannin constituents from chestnut extract
In the preparation of tannin extract from chestnut wood chips there is present in the extract, along with the tannin, certain insoluble non-tannin constituents. If allowed to remain in the extract, these materials make the tanning solution unsuitable for use in the manufacture of leather. To …
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Evaluation of parameters affecting the colloidal destabilization of spent vegetable tannin liquor
… a chemical method for treating spent vegetable tannin liquor. Vegetable tannin wastes are plagued by a multitude of undesirable characteristics, principal of which is a color problem. Historically, chemical coagulation processes have been successful in reducing color associated with industrial …
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Temporal composition of tannin and carbohydrate content in Eucalyptus leaves in South Africa
… study reports on the seasonal variation of the tannin concentration and carbohydrate content of the leaves of nine Eucalyptus species. Soluble tannins were quantified using Hagerman test and the carbohydrate content with a refractometer. Generally high tannin concentrations were observed during …
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Enzymatic polymerisation in situ of depolymerised mimosa tannin applied to stabilisation of collagen
Vegetable tannins used in tanning of hides and skins are limited to surface reactions by their large molecular weights. The molecular weight reduces penetration into the skin and lowers the thermal stability or tanning effect. Investigation into the utilisation of small phenolic compounds such as …
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Acorn Caching and Consumption of Weevil-infested Nuts: Possible Means of Tannin Circumvention for the Blue Jay
… properties of secondary compounds (tannins) found in the acorns of many oak species. I examined responses by blue jays to a mixture of infested and uninfested pin oak (Ouercus palustris Muenchh.) acorns to see if jays selectively consumed nuts containing weevil larvae (Curculio) as a …
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Management Strategies for Natural Cider Fermentation: Effects of sulfite addition and acidification in high- and low- tannin cultivars
… outcomes for naturally fermented high- and low-tannin apple cultivars. Four treatment conditions were applied to both the high- and the low- tannin cultivars: acidification only, sulfites only, acidification and sulfites, and a control with no pre-fermentation juice chemistry adjustment. The …
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Carbon based secondary metabolites in African savanna woody species in relation to anti-herbivore defense
… species have been inferred from foliar condensed tannin and total phenolic concentrations. However these measures are controversial since condensed tannin chemical heterogeneity compromises its simple quantification and total phenolics, which is a measure of general foliar phenolics, includes many …
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Determination of tannin levels in multi-purpose Kenyan trees and fodder crops, their variation and effect on protein digestibility in ruminants
… and have high protein content. These trees have tannins whose levels, seasonal and altitude distribution have not been established. Previous studies have indicated that tannins may have either beneficial effects like bloat control and increased protein bypass, or deleterious effects like the …
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EFFECT OF GENOTYPES, TANNIN LEVEL AND PROCESSING METHODS ON THE PHYSICOCHEMICAL, NUTRITIONAL AND STRUCTURAL CHARACTERISTICS OF FABA BEAN GROWN IN WESTERN CANADA
… study was to determine the effect of genotypes, tannin levels (low and normal) and heat processing methods on the structural, physicochemical, and nutritional characteristics of faba bean grown in western Canada as an alternative protein and energy source for ruminants. The faba bean used for …
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Tannin – starch interplay: Investigating the impact of grape tannins on the properties of various starches : A dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Food Innovation at Lincoln University
… Interaction of starch with bio-molecules such as tannins can significantly enhance the overall textural-cum-nutritional properties of starch. Tannins, a rich source of phenolic compounds and exhibits antioxidants activity, can interact with various molecules, including starch and proteins in …
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Genetics and Biochemistry of the Low Tannin Characteristic in Vicia faba L. and Development of a Molecular Marker for the zt2 Gene
… all the other pulses. The presence of condensed tannins (proanthocyanidins) in the testa of the seeds limits the use of faba bean both in the food and feed industries. Low tannin faba bean varieties are available for cultivation. The low tannin phenotype is controlled by two genes zt1 and zt2. …
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The effect of condensed tannins on goats’ body weight
Tannins are one of the most common plant secondary compounds. Amongst the tannins are condensed tannins (CT), which occur nearly in every plant species browsed by goats. Condensed tannins have a potential to bind proteins, reduce the feed intake and consequently reduce the body weight gain of …
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Stærð munnvatnskirtla í hrossum: mælikvarði á hæfileika til tanninbindingar
… um mögulegan eiginleika hrossa til að binda tannin. Engar rannsóknir hafa verið birtar á þessu sviði svo óljóst er hvort hross hafa þennan eiginleika, en þegar tekið er tillit til þróunarfræðilegs bakgrunns þeirra er það ekki er óhugsandi. Dýr sem lifa á runnagróðri búa yfirleitt yfir …
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