Pink pigments

PVPP is commonly used to remove undesirable brown or pink pigments from wine (Jackson, 1994). However, because much of the color of red wine is due to polyphenolic compounds, treatment with PVPP or other polyamides can diminish the red color and so must be carefully controlled. Additions of gelatin or egg white (egg albumin has about... 

Tappel (1957) was among the first to record spectral characteristics of the pink pigments of... 

Shiba T (1991) Roseobacter litoralis gen. nov., sp. nov., and Roseobacter denitrificans sp. nov., aerobic pink-pigmented bacteria which contain bacteriochlorophyU a. System Appl Microbiol 14 140-145... 

This assay is basically used to appoint the lipid oxidation. It is an older test for receiving the oxidation status of fats spectrophotometricaUy. Thereby the aldehydes, which are generated by the autoxi-dation of unsaturated fatty acids, are converted into red or yellow colorimeters with TEA. Eut it is also used for the determination of the potency of antioxidants with thiobarbituric acid reactive substances (TEARS). Thereby the antioxidant activity is measmed by the inhibition of the lipid oxidation. It concerns the spectrophotometric detection of malonic aldehyde, one of the secondary lipid peroxidation products, which generates a pink pigment with TEA (Ruberto et al., 2000 Varda-Unlii etal.,2003). 

Kato, M. and Takahashi, M. (2001) Synthesis of Cr-doped NdA103-Al203 reddish pink pigment /. Mater. Scl Lett, 20,413 14. 

The pink pigment, sometimes seen in urinary uric acid deposits with which it is precipitated. 

Evidence of this technique has been found by the present authors in a sample of a pink pigment containing textile fibres and tannins excavated from Pompeii, dating to the second century ad (Walsh et al., 2004) and fibres have also been found within a sample of red lake from Titian s Venus and Adonis (c. 1560) analysed at the J. Paul Getty Museum (Birkmaier et al., 1995). 

Lund BM, Brocklehurst TF, Wyatt GM (1981) Characterization of strains of Clostridium puniceum sp. nov., a pink-pigmented, pectolytic bacterium. J Gen Microbiol 122 17-26... 

In clone 02, the pink cells are usually brilliant pink (Petunia Purple, Color No. 32 but occasionally they may appear as deep maroon, or they can be extremely faint in hue. However, a cell is scored as pink if any pink pigment can be recognized (Figs. 7 and 9). A didimium filter (Fish-Schurman Corp., New Rochelle, N.Y.) can be used to intensify the pink color and improve blue-to-pink contrast. 

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