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Bials Orcinol TestGroup 5Algarme Dablo Garde Provida Solano Yu
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Background
Pentose is amonosaccharide withve carbon atoms
Hexose is amonosaccharide with
si! carbon atoms"#lose $#!ose
Arabinose %ibose
Galactose Glucose &
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Pur'ose
To test the 'resence o* 'entose in thesolution
To distinguish 'entoses *rom he!oses
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-om'osition
Orcinol %eagent contains( Orcinol . reacts with deh#drated 'entose to
*orm *ur*ural /#drochloric acid deh#drates 'entose to *orm
*ur*ural with orcinol &erric chloride . gives a bluish.violet coloration
with the a0ueous solution o* orcinol
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Procedure
2 m$625 dro's o* Glucose, &ructose and"#lose is6are added in each o* the 7 testtubes with 2 m$625 dro's o* Orcinolsreagent then warmed in water bath 843until a change in color is observed+
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%esults
S'eci c ob9ective(To determine the
presence of pentoses
-olor o* reagentYellow
Samples Observations
Glucose &rom light #to intense #solution
&ructose :ot tested
"#lose &rom light #to intense #solution
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Positive %esult
Bluish solution &ur*ural *urther reacts with orcinol and the iron ion
'resent in the test reagent to 'roduce a bluish'roduct+
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:egative %esult
Green, %ed, Brown solution /e!oses react to *orm Green, %ed, Brown 'roduct
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-om'arison
Seliwano;)s test is a chemical test whichdistinguishes between aldose and ketose sugars
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