TOLLEN'S REACTION FOR PENTOSES
\tˈə͡ʊlənz ɹɪˈakʃən fɔː pˈɛntə͡ʊzɪz], \tˈəʊlənz ɹɪˈakʃən fɔː pˈɛntəʊzɪz], \t_ˈəʊ_l_ə_n_z ɹ_ɪ__ˈa_k_ʃ_ə_n f_ɔː p_ˈɛ_n_t_əʊ_z_ɪ_z]\
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Consists of heating the solution to be tested with concentrated hydrochloric acid and orcin. If pentose is present, the solution turns first reddish blue, then bluish green. The coloring matter formed is soluble in amyl alcohol, yielding a bluish green solution with a characteristic absorption spectrum. A similar test is one in which phloroglucin is used instead of orcin. The color of the solution as well as the amyl alcohol is red, when pentose is present.
By Smith Ely Jelliffe
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Nearby Words
- tollage
- tollbar
- tollbooth
- tollbridge
- tolled
- Tollen's reaction for pentoses
- tollens' reaction
- toller
- tolletane
- tollgate
- tollgatherer