Research draft

disaccharide

vr.tr.disaccharide · PHY.MAT

Let an agent explain disaccharides and their structure, identify common examples and nomenclature, relay digestion, nutrition and food uses, and distinguish disaccharides from monosaccharides and longer oligosaccharides.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

A sugar formed when two monosaccharides are joined by a glycosidic bond, such as sucrose from glucose and fructose, lactose from galactose and glucose, maltose from two glucose units, and trehalose, along with many less common disaccharides defined by their monosaccharides and linkage positions such as xylobiose and various galactosyl, mannosyl and glucosyl pairs; disaccharides are digested by specific enzymes, are important in nutrition and food technology, and intolerance to some, such as lactose, is common.

What it is for: Energy and sweetness in food; building blocks in biochemistry.

It can be explain structure and linkage; identify examples and nomenclature; relay digestion and nutrition; distinguish from other sugars.

Distinguishing features

Glycosidic linkage

Reducing and non-reducing types

Specific digestive enzymes

Systematic nomenclature

What it looks like

White crystalline solids such as table sugar.

Physical character

molecular formula of common disaccharides: C12H22O11 formula

sucrose sweetness: 1 reference - relative scale

How it is recognised

Two monosaccharides joined by a glycosidic bond

Sucrose, lactose, maltose, trehalose and rare linkage isomers

Monosaccharides are single units; oligosaccharides have three to ten; polysaccharides are long chains

Related models

is a kind of - in registry terms

oligosaccharide

is formed from - units by condensation

monosaccharide

is hydrolysed by - enzymes such as lactase

disaccharidase

includes - table sugar

sucrose

In practice

Families and kinds

sucrose

lactose

maltose and isomaltose

trehalose

cellobiose and xylobiose

rare disaccharides named by monosaccharides and linkages such as galactosyl-galactose and glucosyl-mannose pairs

Identifiers

ChEBI CHEBI:36233 disaccharide

Standards and regulation

Food labelling rules for sugars

IUPAC carbohydrate nomenclature

Dietary guidelines on free sugars

Failure modes and hazards

Lactose and other intolerances

Excess sugar intake

Confusing nomenclature of linkage isomers

Also called

4-O-β-D-xylopyranosyl-D-xyloseα-D-galactosyl-(1→2)-α-D-galactoseα-D-Manp-(1→2)-α-D-Manpα-D-Glcp-(1→2)-β-D-Galpβ-D-Glcp-(1→2)-β-D-Galpβ-D-Glcp-(1→2)-α-D-Manpβ-D-Manp-(1→2)-α-D-Manpα-D-galactosyl-(1→2)-β-D-galactoseβ-D-Galp-(1→2)-β-D-Galpα-D-Glcp-(1→2)-α-D-Glcpβ-sophoroseα-D-glucosyl-(1→3)-β-D-mannoseα-D-galactosyl-(1→3)-β-D-mannoseα-D-galactosyl-(1→3)-α-D-galactoseβ-D-galactosyl-(1→3)-α-D-mannoseα-D-Glcp-(1→3)-β-D-Glcpα-D-Manp-(1→3)-α-D-Manpβ-(1→3)-galactobioseα-D-Galp-(1→3)-β-D-Galp3-O-beta-D-glucopyranosyl-beta-D-glucopyranose3-O-alpha-D-glucopyranosyl-alpha-D-glucopyranosehex-2-ulofuranosyl hexopyranosidehexopyranosyl hexopyranosidehexopyranosyl-(1→4)-hexopyranoserutinoseturanoseLacNAcD-Lactitol (monohydrate)4-O-hexopyranosylhex-2-ulofuranose1-O-Acetyl-3,4,6-tris-O-(2-methylpropanoyl)hex-2-ulofuranosyl 6-O-acetyl-2,3,4-tris-O-(2-methylpropanoyl)hexopyranosidevicianoseN-Acetyllactosamineisomaltoserobinosenigerosekojibioseallolactosesucrose acetate isobutyratelactitollaminarabiose

+22

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What disaccharides are.

Science.

Definition

Definition and structure.

Definition

Definition.

What is a disaccharide, and how do glycosidic bonds and linkage positions define them? definition
Is the question about a disaccharide, a monosaccharide or a longer carbohydrate? boundary

Examples

Common examples.

Examples

Examples.

What are sucrose, lactose, maltose and trehalose, and how do they differ? definition
Which entry fits the specific sugar? action

Biology Digestion and nutrition.

Public health.

Digestion

Digestion.

Digestion

Digestion.

How are disaccharides digested, and what causes intolerances such as lactose intolerance? provenance
Is the user asking about a personal digestive problem, which needs a clinician? boundary

Nutrition

Nutrition.

Nutrition

Nutrition.

What do dietary guidelines say about sugars, in general terms? provenance
Which references are standard? provenance

Chemistry Chemistry and nomenclature.

Science.

Nomenclature

Nomenclature.

Nomenclature

Nomenclature.

How are disaccharides named systematically by monosaccharides and linkages? provenance
Which sources are cited? provenance

Properties

Properties.

Properties

Properties.

What are reducing and non-reducing disaccharides, and how are they analysed? provenance
Which entry fits reducing sugar? action

Context Food and industry.

Context.

Food

Food technology.

Food

Food.

How are disaccharides used in food processing, from sweetening to preservation with trehalose? provenance
Which entry fits sugar industry? action

History

History.

History

History.

How were disaccharides characterised in the history of carbohydrate chemistry? provenance
Which entry fits the history of chemistry? action

What the second pass must settle

Should sucrose and lactose be the primary linked entries?
How should nomenclature references be linked?
The registry entry has merged aliases naming rare linkage isomers; should they be split off?

Draft as JSON