title: Altering the rate of glucose release from starch-based foods by spray-drying with an extract from barley.
abstract: BACKGROUND
  Health outcomes associated with sustained elevated blood glucose may be better managed by limiting glucose availability for uptake. Glucose release from consumed starch may be altered using various methods, but many are not suitable for high-carbohydrate foods. This study describes an approach to protect starch granules, while generally maintaining their physical characteristics, with an extract from barley using spray-drying.
  
  
  RESULTS
  The use of the extract resulted in the coating of the starch granules with a film-like material composed of β-glucans and proteins. This coincided with a reduction in starch digestion and a significant increase in the indigestible (resistant) starch component. Substitution of the starch component in a model snack bar by the coated starch was also associated with lowering starch digestion in the bar.
  
  
  CONCLUSIONS
  The barley extract provides a physical barrier that may limit the exposure of starch to the digestive enzymes and water, with a consequent reduction in starch digestion and the rate of glucose release. It is possible, therefore, to produce wheat starch with lower digestibility and glucose release rate that may be used as a healthier substitute in high-carbohydrate foods by coating the granules with polymers extracted from barley cereals through spray-drying.
authors.affiliation: The New Zealand Institute for Plant & Food Research Limited, Gerald Street, Lincoln, Christchurch, New Zealand.
authors.forename: Hussam A A
authors.initials: HA
authors.lastname: Razzaq
authors.forename: Kevin H
authors.initials: KH
authors.lastname: Sutton
authors.forename: Lidia
authors.initials: L
authors.lastname: Motoi
mesh_terms: D004063:Digestion; D005504:Food Analysis; D005511:Food Handling; D005947:Glucose / Q000737:chemistry*; D001467:Hordeum / Q000737:chemistry*; D018613:Microscopy, Confocal; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D010936:Plant Extracts / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry
chemical_list: D010936:Plant Extracts; D013213:Starch; D005947:Glucose
keywords: barley extract; coating; fibres; glucose release rate; spray-drying