Direct Green

Direct Yellow 12 Direct Green 6 Direct Brown 2 Direct Black 38 Direct Blue 15 Direct Red 23 Congo Red Direct Orange 26 Tartrazine P. chrysosporium ZrOCl2-activated pumice [54]... 

Direct green dyes, 9 406 Direct heat dryers, 9 117-127... 

Numerous linear diamines, such as many of those in the survey mentioned above, have been evaluated as potential replacements for benzidine, an inexpensive and highly versatile intermediate that was banned in the 1970s because it posed a carcinogenic threat. Two trisazo dyes have been synthesised recently using 4,4, diaminodiphenyl thioether instead of the benzidine component of Cl Direct Black 38 (3.112 X = Y = NH2) and Cl Direct Green 1 (3.112 X = OH, Y = H). These new dyes exhibited higher substantivity and fastness to washing than the two traditional products on cellulosic fibres [119]. 

Thus, RP-HPLC-MS has been employed for the analysis of sulphonated dyes and intermediates. Dyes included in the investigation were Acid yellow 36, Acid blue 40, Acid violet 7, Direct yellow 28, Direct blue 106, Acid yellow 23, Direct green 28, Direct red 79, Direct blue 78 and some metal complex dyes such as Acid orange 142, Acid red 357, Acid Violet 90, Acid yellow 194 and Acid brown 355. RP-HPLC was realized in an ODS column (150 X 3 mm i.d. particle size 7 /.an). The composition of the mobile phase varied according to the chemical structure of the analytes to be separated. For the majority of cases the mobile phase consisted of methanol-5 mM aqueous ammonium acetate (10 90, v/v). Subsituted anthraquinones were separated in similar mobile phases containing 40 per cent methanol. The flow rate was 1 ml/min for UV and 0.6 ml/min for MS detection, respectively. The chemical structure of dye intermediates investigated in this study and their retention times are compiled in Table 3.28. It was found that the method is suitable for the separation of decomposition products and intermediates of dyes but the separation of the original dye molecules was not adequate in this RP-HPLC system [162],... 

Nonphotosynthetic Even though almost all living organisms depend either directly (green plants) or Processes indirectly (saprophytes and animals) upon photosynthesis to capture the energy of the... 

The use of pyridine during final coupling (pyridine coupling) is illustrated in the following abridged manufacturing specification for C. I. Direct Green 33, 34270 2-aminonaphthalene-8-sulfonic acid —> 3,5-xylidine- 2-ethoxy Cleve acid-6— A-acetyl H acid... 

Compared to direct azo dyes, the direct anthraquinone dyes have lower tinctorial strengths and are therefore far less economical to use. They have lost most of their importance. Only a few special green dyes have retained their importance. Direct green cotton dyes can be produced by coupling a blue bromamine acid dye and a yellow azo dye via ureido or diaminotriazine bridges. 

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