The effect of saliva on the viscosity of thickened drinks.
Identifieur interne : 001170 ( Main/Exploration ); précédent : 001169; suivant : 001171The effect of saliva on the viscosity of thickened drinks.
Auteurs : Ben Hanson [Royaume-Uni] ; Mark T. O'Leary ; Christina H. SmithSource :
- Dysphagia [ 1432-0460 ] ; 2012.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Amylases, Plant Gums, Starch.
- enzymology : Saliva.
- metabolism : Zea mays.
- therapy : Deglutition Disorders.
- Adult, Beverages, Citrus sinensis, Deglutition, Drinking Water, Humans, Hydrogen-Ion Concentration, Male, Viscosity.
Abstract
Powdered thickeners are used to modify drink consistency in the clinical management of dysphagia. These thickeners are composed of primarily modified maize starch; some varieties also incorporate powdered gums. Amylase is a digestive enzyme found in saliva that initiates the breakdown of starch. To determine the significance of this process in dysphagia management, we measured the effects of human saliva on the viscosity of thickened drinks. Two thickeners were studied: one comprising modified maize starch alone and one that included additional gums. These were added to drinks with neutral and acidic pH: water and orange juice. Two clinical scenarios were simulated: (1) the effect of saliva on fluid as it is swallowed and (2) the effect when saliva enters a cup and contaminates a drink. Saliva was found to reduce the viscosity of water thickened with maize starch in both scenarios: (1) 90% reduction after 10 s and (2) almost 100% reduction in viscosity after 20 min. The thickener composed of gums and maize starch showed a significant reduction but retained a level of thickening. In contrast, thickened orange juice (pH 3.8) was not observed to undergo any measurable reduction in viscosity under the action of saliva.
DOI: 10.1007/s00455-011-9330-8
PubMed: 21374083
Affiliations:
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O'Leary</name></author><author><name sortKey="Smith, Christina H" sort="Smith, Christina H" uniqKey="Smith C" first="Christina H" last="Smith">Christina H. 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O'Leary</name></author><author><name sortKey="Smith, Christina H" sort="Smith, Christina H" uniqKey="Smith C" first="Christina H" last="Smith">Christina H. Smith</name></author></analytic><series><title level="j">Dysphagia</title><idno type="eISSN">1432-0460</idno><imprint><date when="2012" type="published">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Amylases (metabolism)</term><term>Beverages</term><term>Citrus sinensis</term><term>Deglutition</term><term>Deglutition Disorders (therapy)</term><term>Drinking Water</term><term>Humans</term><term>Hydrogen-Ion Concentration</term><term>Male</term><term>Plant Gums (metabolism)</term><term>Saliva (enzymology)</term><term>Starch (metabolism)</term><term>Viscosity</term><term>Zea mays (metabolism)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Amylases</term><term>Plant Gums</term><term>Starch</term></keywords><keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Saliva</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Zea mays</term></keywords><keywords scheme="MESH" qualifier="therapy" xml:lang="en"><term>Deglutition Disorders</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Beverages</term><term>Citrus sinensis</term><term>Deglutition</term><term>Drinking Water</term><term>Humans</term><term>Hydrogen-Ion Concentration</term><term>Male</term><term>Viscosity</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Powdered thickeners are used to modify drink consistency in the clinical management of dysphagia. These thickeners are composed of primarily modified maize starch; some varieties also incorporate powdered gums. Amylase is a digestive enzyme found in saliva that initiates the breakdown of starch. To determine the significance of this process in dysphagia management, we measured the effects of human saliva on the viscosity of thickened drinks. Two thickeners were studied: one comprising modified maize starch alone and one that included additional gums. These were added to drinks with neutral and acidic pH: water and orange juice. Two clinical scenarios were simulated: (1) the effect of saliva on fluid as it is swallowed and (2) the effect when saliva enters a cup and contaminates a drink. Saliva was found to reduce the viscosity of water thickened with maize starch in both scenarios: (1) 90% reduction after 10 s and (2) almost 100% reduction in viscosity after 20 min. The thickener composed of gums and maize starch showed a significant reduction but retained a level of thickening. In contrast, thickened orange juice (pH 3.8) was not observed to undergo any measurable reduction in viscosity under the action of saliva.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Grand Londres</li></region><settlement><li>Londres</li></settlement><orgName><li>University College de Londres</li></orgName></list><tree><noCountry><name sortKey="O Leary, Mark T" sort="O Leary, Mark T" uniqKey="O Leary M" first="Mark T" last="O'Leary">Mark T. O'Leary</name><name sortKey="Smith, Christina H" sort="Smith, Christina H" uniqKey="Smith C" first="Christina H" last="Smith">Christina H. Smith</name></noCountry><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Hanson, Ben" sort="Hanson, Ben" uniqKey="Hanson B" first="Ben" last="Hanson">Ben Hanson</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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