Anderson, R. A. & Sowers, J. A. (1968). Optimum conditions for binding of plant phenols to insoluble polyvinylpyrrolidone. Phytochemistry 7, 293–301.
Asquith, T. N. & Butler, L. G. (1985). Use of dye-labeled protein as spectrophotometric assay for protein precipitants such as tannin. Journul of Chemical Ecology 11, 1535–1544.
Asquith, T. N., Uhlig, J., Mehansho, H., Putman, L., Carlson, D. M. & Butler, L. (1987). Binding of condensed tannins to salivary proline-rich glycoproteins: the role of carbohydrate. Journal of Agricultural and Food Chemistry 35, 331–334.
Badran, A. M. & Jones, D. E. (1965). Polyethylene glycols-tannin interactions in extracting enzymes. Nature 206, 622–623.
Barroga, C. F., Laurena, A. C. & Mendoza, E. M. (1985). Effect of condensed tannins on the in vitro protein digestibility of mung bean (Vigna radiata (L.) Wilczek). Journal of Agricultural and Food Chemistry 33, 1157–1159.
Barry, T. N. & Duncan, S. J. (1984). The role of condensed tannins in the nutritive value of Lotus pedunculatus for sheep. 1. Voluntary intake. British Journal of Nutrition 51, 485–491.
Barry, T. N. & Manley, T. R. (1986). Interrelationships between the concentrations of total condensed tannins, free condensed tannins and lignin in Lotus sp. and their possible consequences in ruminant nutrition. Journal of the Science of Food and Agriculture 31, 248–254.
Bl¨lmmel, M. & Ørskov, E. R. (1993). Comparison of in vitro gas production and nylon bag degradability of roughage in predicting feed intake in cattle. Animal Feed Science and Technology 40, 109–119.
Cafantaris, B. (1981). Ueber die Wirkung von Antibiotikazsaetzen auf die mikrobielle Gaerung im Pansensaft in vitro. (The influence of antibiotic supplements on microbial fermentation in rumen fluid in vitro.) Ph.D. Thesis, University of Hohenheim, Stuttgart, Germany.
Doner, L. W., Bécard, G. & Irwin, P. L. (1993). Binding of flavonoids by polyvinylpolypyrrolidone. Journal of Agricultural and Food Chemistry 41, 753–757.
Foley, W. J. & Hume, I. D. (1987). Digestion and metabolism of high-tannin Eucalyptus foliage by the brushtail possum (Trichosurus vulpecula) (Marsupialia: Phalangeridae). Journal of Comparative Physiology B 157,67–76.
Garrido, A., Gomez-Cabrera, A., Guerrero, J. E. & van der Meer, J. M. (1991). Effects of treatment with. polyvinylpyrrolidone and polyethylene glycol on faba bean tannins. Animal Feed Science and Technology 35, 199–203.
Glenn, J. L., Durley, R. C. & Pharis, R. P. (1972). Use of insoluble polyvinylpyrrolidone for purification of plant extracts and chromatography of plant hormones. Phytochemistry 11, 345–351.
Goering, H. G. & van Soest, P. J. (1970). Forage Fiber Analysis. Agriculture Handbook no. 379. Washington DC: Agricultural Research Station, US Department of Agriculture.
Hagerman, A. E. & Butler, L. G. (1981). Specificity of proanthocyanidin-protein interactions. Journal of Biological Chemistry 256, 4494–4497.
Hagerman, A. E. & Robbins, C. (1993). Specificity of tannin-binding salivary proteins relative to diet selection by mammals. Canadian Journal of Zoology 71, 628–633.
Hemingway, R. W. (1989). Structural variation in proanthocyanidins and their derivatives. In Chemistry and Significance of Condensed Tannins, pp. 83–108 [Hemingway, R.W. and Karchesy, J. J., editors]. New York: Plenum Press.
Horigome, T., Ohkuma, T. & Muta, M. (1984). Effect of condensed tannins of false acacia leaves on protein digestibility as measured with rats. Japanese Journal of Zootechnical Science 55, 209–306.
Hydén, S. (1955). A turbidity method for the determination of higher polyethylene glycol in biological materials. Kungl Lantbrukshögskolans Annaler 22, 139–145.
Khazaal, K. & Ørskov, E. R. (1993). A preliminary investigation on the use of the in vitro gas production technique with polyvinylpyrrolidone for the assessment of antinutritive factors in browse. In Proceedings of the VIIth World Conference on Animal Production, Vol. 3, pp. 245–246. Edmonton: University of Alberta.
Laurena, A. C., Truong, V. D. & Mendoza, E. M. T. (1984). Effects of condensed tannins on the in vitro protein digestibility of cowpea (Vigna unguiculata L. Walp). Journal of Agricultural and Food Chemistry 32, 1045–1048.
McArthur, C. (1988). Variation in neutral detergent fiber analysis of tannin-rich foliage. Journal of Wildlife Management 52, 374–378.
Makkar, H. P. S. & Becker, K. (1993). Behaviour of tannic acid from various commercial sources towards redox, metal complexing and protein precipitation assays of tannins. Journal of the Science of Food and Agriculture 62, 295–299.
Makkar, H. P. S. & Becker, K. (1994). Isolation of tannins from leaves of some trees and shrubs and their properties. Journal of Agricultural and Food Chemistry 42, 731–734.
Makkar, H. P. S., Blümmel, M., Borowy, N. K. & Becker, K. (1993). Gravimetric determination of tannins and their correlations with chemical and protein precipitation methods. Journal of the Science of Food and Agriculture 61, 161–165.
Makkar, H. P. S., Dawra, R. K. & Singh, B. (1988). Determination of both tannin and protein in a tannin-protein complex. Journal of Agricultural and Food Chemistry 36, 523–525.
Makkar, H. P. S. & Singh, B. (1991). Distribution of condensed tannins (proanthocyanidins) in various fibre fractions in young and mature leaves of some oak species. Animal Feed Science and Technology 32, 253–260.
Makkar, H. P. S., Singh, B. & Dawra, R. K. (1987). Tannin-nutrient interactions-a review. International Journal of Animal Science 2, 127–139.
Marten, G. C. & Barnes, R. F. (1980). Prediction of energy digestibility of forages with in vitro rumen fermentation and fungal enzymes systems. In Standardization of Analytical Methodology of Feeds, pp. 61–71 [Pigden, W.J., Balch, C. C. and Graham, M., editors]. Ottawa: International Development Research Centre.
Menke, K. H., Raab, L., Salewski, A, Steingass, H., Fritz, D. & Schneider, W. (1979). The estimation of the digestibility and metabolizable energy content of ruminant feedstuffs from the gas production when they are incubated with rumen liquor. Journal of Agricultural Science 93, 217–222.
Ørskov, E. R. & McDonald, I. (1979). The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. Journal of Agricultural Science 92, 499–503.
Percival, F. W. (1986). Isolation of indol-3-acetyl amino acids using polyvinylpyrrolidone chromatography. Plant Physiology 80, 259–263.
Porter, L. J., Hrstich, L. N. & Chan, B. C. (1986). The conversion of procyanidins and prodelphinidins to cyanidin and delphinidin. Phytochemistry 25, 223–230.
Pritchard, D. A, Martin, P. R. & O'Rourke, P. K. (1992). The role of condensed tannins in the nutritive value of mulga (Acacia aneura) for sheep. Australian Journal of Agricultural Research 43, 1739–1746.
SAS (1988). SAS/STAT Program. Cary, NC: SAS Institute Inc.
Tilly, J. M. A. & Terry, R. A. (1963). A two-stage technique for the in vitro digestion of forage crops. Journal of the British Grasslands Society 18, 104–111.
Wrolstad, R. E. (1968). Thin-layer chromatography of anthocyanins on mixed layers of polyvinylpyrrolidone and cellulose. Journal of Chromatography 37, 542–544.