Lab 1: Identification of carbohydrates
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Questions and Answers

Quin es el tipus de sucre que es redueix a través de Tollen's reagent?

  • Galactosa (correct)
  • Sacarosa
  • Fructosa (correct)
  • Glucosa (correct)

Quin dels següents compostos es classifica com un heteropolisacàrid?

  • Inulina
  • Glucogen
  • Amilopectina
  • Pectin (correct)

Quina prova es fa servir per identificar els pentoses?

  • Prova de Bial (correct)
  • Prova de Barfoed
  • Prova de Fehling
  • Prova de Molisch

Quin dels següents compostos és un polisacàrid?

<p>Inulina (B)</p> Signup and view all the answers

Quina reacció utilitza el cupròs per identificar la presència de sucres reductors?

<p>Prova de Benedict (B), Prova de Fehling (D)</p> Signup and view all the answers

Quin d'aquests és un exemple de monosacàrid?

<p>Galactosa (D)</p> Signup and view all the answers

Quina és la classi de carbohidrat formada per cadenes llargues de monosacàrids?

<p>Polisacàrids (B)</p> Signup and view all the answers

Quina substància es forma quan un polisacàrid és hidrolitzat?

<p>Monosacàrids (A)</p> Signup and view all the answers

Quin metabolisme es relaciona amb els oligosacàrids?

<p>Fermentació (D)</p> Signup and view all the answers

Quin es lo resultat del test de Molisch per identificar los carbs?

<p>Un anell violeta amb naphthol (C)</p> Signup and view all the answers

Quin dels seguenti tests es especific per l'identificacions de la galactosa?

<p>Test de Mucic Acid (D)</p> Signup and view all the answers

Cossí lo test de Benedict indica la preséncia d'un sucre redut?

<p>Amb un precipitat vermelh (A)</p> Signup and view all the answers

Quina es la durada del test de Barfoed per monosacàrids?

<p>3 min (C)</p> Signup and view all the answers

Quin test requisit d'un agent oxidant per l'identificacions de sucres?

<p>Test de Fehling (A)</p> Signup and view all the answers

Cossí es reconeguda la preséncia de ketohexoses dins lo test de Seliwanoff?

<p>Per un producte vermelh (D)</p> Signup and view all the answers

Quin es lo resultat d'un teste per pentoses dins lo test de Bi al?

<p>Producte de furfural (B)</p> Signup and view all the answers

Cossí lo test de Fehling indica la preséncia de sucres reduts?

<p>Amb un precipitat de cuprous oxide (D)</p> Signup and view all the answers

Qual test se utiliza per verificar la preséncia de furfural dins los monosacàrids?

<p>Test de Molisch (B)</p> Signup and view all the answers

Quin es lo terminus per descriure un saccharide format per un molécule de glucose e un molécule de fructose?

<p>Disaccharide (A)</p> Signup and view all the answers

Quina reaccion proporciona un resultat roge amb un òxid cuprós quand se testa la preséncia d'un aldose?

<p>Reaccion de benedict (D)</p> Signup and view all the answers

En quina forma se presenta la lactosa?

<p>Galactose e glucose (B)</p> Signup and view all the answers

Quin test se utiliza per identificar la preséncia de fructose?

<p>Test de Seliwanoff (C)</p> Signup and view all the answers

Quin dels següents es un monosaccharide?

<p>Ribose (B)</p> Signup and view all the answers

Quin dels següents composts es insoluble en aiga?

<p>Mucic acid (B)</p> Signup and view all the answers

Quin d'aquests composts es un ketose?

<p>Fructose (C)</p> Signup and view all the answers

Quina es la formula generala per los disaccharides?

<p>C_n(H2O)_(n-1) (D)</p> Signup and view all the answers

Quin test se utiliza per detectar la preséncia de pentoses?

<p>Test de Bials (B)</p> Signup and view all the answers

Quina es la propietat especifica dels disaccharides en preséncia de certs agents químics?

<p>Reduir l'òxid cuprós (D)</p> Signup and view all the answers

What type of sugars are ribose and galactose classified as?

<p>Pentoses (A)</p> Signup and view all the answers

Which test is specifically used to identify the presence of fructose?

<p>Seliwanoff's test (C)</p> Signup and view all the answers

Which reagent gives a reddish cuprous oxide result indicating a positive test for reducing sugars?

<p>Benedict's reagent (A)</p> Signup and view all the answers

What is produced when lactose undergoes hydrolysis?

<p>Glucose and galactose (A)</p> Signup and view all the answers

What is a typical result when conducting the Molisch test on carbohydrates?

<p>Purple coloration (A)</p> Signup and view all the answers

Which monosaccharide is soluble in water?

<p>Galactose (C)</p> Signup and view all the answers

Which of the following reactions would lead to a blue-green product when a pentose is present?

<p>Bial's test (B)</p> Signup and view all the answers

What does the Seliwanoff test specifically indicate when conducted on sugars?

<p>Presence of ketoses (C)</p> Signup and view all the answers

What type of carbohydrate is formed by the combination of glucose and fructose?

<p>Disaccharide (A)</p> Signup and view all the answers

Which substance provides a positive result in Barfoed's test for monosaccharides?

<p>Fructose only (C)</p> Signup and view all the answers

Which test specifically identifies ketoses?

<p>Seliwanoff Test (A)</p> Signup and view all the answers

Which of the following sugars takes the longest to react in the Barfoed's Test?

<p>Disaccharides (B)</p> Signup and view all the answers

What color change indicates the presence of furfural in the identification of pentoses in Bi al's Test?

<p>Blush (B)</p> Signup and view all the answers

Which test requires nitric acid for the specific identification of galactose?

<p>Mucic Acid Test (B)</p> Signup and view all the answers

In the Seliwanoff Test, which product results from the reaction of ketohexoses?

<p>Red product (A)</p> Signup and view all the answers

What is the result of the Molisch Test for carbohydrate identification?

<p>Purple ring (D)</p> Signup and view all the answers

What is formed when galactose is oxidized during the Mucic Acid Test?

<p>Insoluble mucic acid (C)</p> Signup and view all the answers

Which of the following tests indicates reducing sugars through the formation of a reddish precipitate?

<p>Benedict's Test (A)</p> Signup and view all the answers

Which reagent is used in the Seliwanoff Test to differentiate between aldose and ketose?

<p>Resorcinol (C)</p> Signup and view all the answers

What duration is required for ketohexoses to react in the Seliwanoff Test?

<p>2 minutes (C)</p> Signup and view all the answers

Which of the following types of polysaccharides consists of more than one kind of monosaccharide?

<p>Heteropolysaccharide (C)</p> Signup and view all the answers

Which reagent is used to oxidize reducing sugars?

<p>Tollen's reagent (A)</p> Signup and view all the answers

In which test are pentoses identified?

<p>Bial's test (D)</p> Signup and view all the answers

What type of carbohydrate is inulin classified as?

<p>Polysaccharide (D)</p> Signup and view all the answers

Which property distinguishes a reducing sugar from a non-reducing sugar?

<p>Oxidation by specific reagents (A)</p> Signup and view all the answers

What is the primary product formed when lactose is hydrolyzed?

<p>Galactose and glucose (B)</p> Signup and view all the answers

Which test is NOT used to identify the presence of reducing sugars?

<p>Mucic acid test (D)</p> Signup and view all the answers

Which of the following components is involved in conducting Bial's test?

<p>Copper(II) sulfate (B)</p> Signup and view all the answers

What is the significance of white precipitate formation in a reagent test for reducing sugars?

<p>Demonstrates successful oxidation (B)</p> Signup and view all the answers

Which of the following tests identifies the presence of glucuronic acid?

<p>Mucic acid test (A)</p> Signup and view all the answers

Flashcards

Disaccharide

A type of sugar formed by the combination of two monosaccharides.

Covalent Bond

A chemical bond formed by the sharing of electrons between atoms.

Benedict's Test

A chemical test used to detect reducing sugars.

Reducing Sugar

A sugar that can donate electrons to another substance.

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Tollen's Test

A test to detect aldehydes.

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Fructose

A monosaccharide sugar commonly found in many fruits.

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Galactose

A monosaccharide sugar.

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Lactose

Disaccharide composed of glucose and galactose.

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Seliwanoff's Test

A chemical test used to distinguish fructose from glucose.

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Monosaccharides

The simplest form of sugars, single-unit sugars.

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Reducing sugar

A sugar that can reduce other substances during a chemical reaction.

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Lactose Identification

A test to identify lactose, a disaccharide.

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Molisch Test

A test to detect carbohydrates, producing a purple ring.

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Benedict's reagent

A chemical solution used to detect reducing sugars.

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Anthrone Test

Test for carbohydrates, produces a blue-green color.

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Polysaccharide

A complex carbohydrate formed from many monosaccharides.

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Homopolysaccharide

A polysaccharide made up of one type of monosaccharide.

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Barfoed's Test

Quick test for monosaccharides. Identifies reducing monosaccharides.

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Heteropolysaccharide

A polysaccharide made up of more than one type of monosaccharide.

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Seliwanoff's Test

Discriminates ketoses from aldoses . Faster for ketohexoses.

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Bial's Test

Identifies pentoses, producing a bluish product.

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Bial's test

A chemical test used to identify pentoses (five-carbon sugars).

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Inulin

A polysaccharide.

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Benedict's Test

Determines presence of reducing sugars. Produces a reddish precipitate.

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Fehling's Test

Another test for reducing sugars, using a different reagent.

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Tollen's reagent

A reagent used in the test for reducing sugars.

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Mucic Acid Test

Specific test for galactose using nitric acid.

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Mucic test

A test used for a particular carbohydrate type (not specified in content provided).

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Carbohydrate Identification

Various tests to categorize and identify types of carbohydrates based on their structure.

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Pentoses

A type of sugar containing five carbon atoms.

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Disaccharide identification

A process for distinguishing between different types of disaccharides.

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Benedict's Test

A chemical test to detect the presence of reducing sugars.

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Tollen's test

A chemical test for aldehydes.

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Fructose identification

Using chemical tests (e.g., Seliwanoff's) to distinguish fructose from other sugars.

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Galactose identification

Identifying galactose using specific chemical tests (e.g., Mucic acid test).

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Lactose identification

Identifying lactose, a disaccharide, using specific chemical tests.

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Seliwanoff's test

A chemical test to distinguish fructose from glucose.

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Bial's test

Identifies pentoses (five-carbon sugars).

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Molisch's test

A test for carbohydrates that produces a purple ring.

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Reducing sugar identification

Identifying reducing sugars through chemical reactions.

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Reducing sugar test

A chemical test to identify sugars that can donate electrons.

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Polysaccharide example

A complex carbohydrate made of multiple monosaccharides.

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Benedict's reagent use

A reagent used for detecting reducing sugars.

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Bial's test use

Used to detect pentoses (5-carbon sugars).

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Heteropolysaccharide

A complex carbohydrate formed by different types of sugars.

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Homopolysaccharide example

A polysaccharide built exclusively from one monosaccharide.

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Mucic Test

A test used to detect a specific sugar.

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Pentoses

Sugars containing five carbon atoms.

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Carbohydrate identification

Using varied tests to categorize and identify distinct carbohydrate types based on structure.

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Tollen's reagent use

Reagent that reacts with aldehydes, not all sugars.

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Molisch Test

A general test for carbohydrates, producing a purple ring upon reaction.

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Anthrone Test

A carbohydrate identification test, creating a blue-green color if carbohydrates are present.

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Barfoed's Test

Rapid test for monosaccharides, especially reducing ones.

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Seliwanoff's Test

Differentiates ketohexoses (fructose) from aldohexoses (glucose), faster for ketoses.

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Bial's Test

Identifies pentoses (5-carbon sugars) by producing a bluish product.

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Benedict's Test

Identifies reducing sugars, creating a red precipitate upon reaction.

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Fehling's Test

Another test for reducing sugars, using different reagents.

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Mucic Acid Test

Specifically tests for galactose, producing insoluble mucic acid.

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Reducing Sugar

A sugar capable of donating electrons, giving a positive result in reducing sugar tests

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Carbohydrate Identification

Variety of tests categorizing different types.

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Study Notes

Objectius

  • Examina las reaccions quimicas caracteristiques per identificar diferents carboidrats.

Teoria

  • Los carboidrats son fonts d'energia rapida.
  • Composats de carboni, hidrogeni e oxigen.
  • Antiga teoria: "hidrat de carboni" (relacion H/O de 2:1)
  • Actualament classificats coma polihidroxialdehids o polihidroxicetones.
  • Tres classes principals: monosacàrids, oligosacàrids (disacàrids) e polisacàrids.

Monosacàrids

  • Composts cristal·lins solubles en aigua.
  • Aldehids o cetones alifàtiques amb un grup carbonil e un o mès grups hidroxil.
  • També anomenats sucres simples o unicells.
  • Els hexoses més comuns son la glucosa, fructosa e galactosa.
  • Els pentoses més comuns son l'arabinosa e l'xilosa.

Oligosacàrids

  • Polymers de monosacàrids.
  • Pes molecular relativament baix (menys de 20 unitats).
  • Units per enllaços glicosídics.
  • Disacàrids exemples: sacarosa, lactosa e maltosa.

Polisacàrids

  • Polymers de monosacàrids amb un pes molecular elevad.
  • Mès de 20 unitats.
  • Exemples: glucogen (forma de reserva d'energia dels animals), midó (forma de reserva d'energia de las plantes), celulosa (fibra basada en beta-glucosa), inulina (reserva de fructosa en algunes plantes).
  • Homopolisacàrids: contenen un sol tipus de monosacàrid.
  • Heteropolisacàrids: contenen mès d'un tipus de monosacàrid.

Nomenclatura dels carboidrats

  • El nom de cada sucre acaba en "-osa" (exemple: glucosa, fructosa).
  • També s'anomenen per el seu grup funcional (aldehid –aldo–, cetona –ceto–) e el nombre de carbonis (pent, hex, etc.).
  • Exemples: glucosa (aldohexosa), fructosa (cetohexosa), ribosa (aldopentosa).

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Carbohydrates Practical Quiz 2018-2019 PDF

Description

Examinez los diferents tipus de carboidrats e las reaccions quimicas que los caracterizan. Estudiatz los monosacàrids, oligosacàrids e polisacàrids per comprene la sua importància e estructura. Aqueste cuestionari es destinat als estudiants que vòlon aprofitar los coneissenças culinaris e biologics.

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