Definition
noun
A method used to detect the presence of pentoses with a test reagent consisting of orcinol, HCl and ferric chloride.
Supplement
This test is used to detect the presence of a pentose in urine. In the presence of pentoses, the test reagent dehydrates pentoses to form furfural. Furfural, then, reacts with orcinol. The iron ion in the test reagent will produce a bluish product. Thus, a bluish solution with which precipitate may form indicates positive for (or the presence of) pentoses.
Synonym: Bial’s test, Bial’s orcinol test.
See also: orcinol, pentose.
Dictionary > Orcinol test
You will also like...
![Cell structure](https://www.biologyonline.com/wp-content/uploads/2020/02/Cell-structure-276x168.jpg)
Cell Structure
A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..
![Golgi apparatus (3-D illustration)](https://www.biologyonline.com/wp-content/uploads/2020/02/Role-of-Golgi-Apparatus-Endoplasmic-Reticulum-in-Protein-Synthesis-252x168.jpg)
Role of Golgi Apparatus & Endoplasmic Reticulum in Protein Synthesis
The endoplasmic reticulum and Golgi apparatus are the organelles involved in the translation step of protein synthesis a..
![Chromosome Mutations](https://www.biologyonline.com/wp-content/uploads/2020/02/Chromosome-Mutations-238x168.jpg)
Chromosome Mutations
Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..
![Still freshwater and plants](https://www.biologyonline.com/wp-content/uploads/2020/02/Still-Freshwater-Plants-262x168.jpg)
Still Freshwater & Plants
Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..
![An artistic depiction of a human embryo](https://www.biologyonline.com/wp-content/uploads/2020/02/Growth-and-Development-of-a-Human-Baby-252x168.jpg)
Growth and Development of a Human Baby
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..
![Growth and Plant Hormones](https://www.biologyonline.com/wp-content/uploads/2020/02/Growth-and-Plant-Hormones-300x158.jpg)
Growth and Plant Hormones
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..