a b s tract
Barley rusksaretraditionalbakeryitemsthatexistedasfoodstapleoftheCretan—Mediterranean
dietandanaturalsourceofcereal β-glucans thathavewell-recognizedhypocholester-
olemic andhypoglycemicproperties,largelyattributed totheirrheologicalbehavior.Theaimof
this workwastoevaluatetheinfluenceof flour particlesizeandhydrothermaltreatmentonthe
potentialnutritionalfunctionalityofbarleyrusks.Rusksweremadeusingeitheracoarse(d50
350 μm) ora fine (d50 200 μm) barley flourstreamwithout(control)orwithpriorautoclavingat
two moisturelevels(11–12 and13–14%). HPLC-SEC-RIprofiles of β-glucansisolatedfrombarley
floursandruskrevealedashiftoftheirmolecularweight(MW),fromabove1106 to 0.17–
0.28106, uponruskmakingduetoendogenous β-glucanaseactivity.However,theMWof
β-glucansintheproductswaspreserveduponcompletethermalinactivationof β-glucanase,
merelyby flourautoclavingat13–14% moisture.The ‘physiologicalimpact’ ofbarleyruskswas
assessed bymeasuringtheamountofsolubilized β-glucans(0.5–0.7g/100grusk)andthe
viscosity(2–7mPas)oftheruskextracts,usingan in vitro digestionprotocol.Bothautoclaving
and increasing flourparticlesizesignificantly(po0.05)increasedtheviscosityoftherusk
‘physiologicalextracts’. Furthermore,withan in vitro digestion assay,lowerenzymicstarch
degradationwasnotedforthecoarse flourruskscomparedtotheproductsmadefromthe fine
flour(18–37%vs.32–53% after5hofdigestion).Flour autoclavingalsoledtosignificant(po0.05)
reduction ofstarchdigestibility. Astrongnegativecorrelation(p¼0.003) betweenthedegreeof
starch enzymicdegradationandtheviscosity oftheruskextractswasfound.Overall, flour
particlesizeandautoclavingof flourcouldbekeyprocessingfactorsformakingbarley-based
baked itemswithimprovednutritional–physiologicalfunction.
a b s tractBarley rusksaretraditionalbakeryitemsthatexistedasfoodstapleoftheCretan—Mediterraneandietandanaturalsourceofcereal β-glucans thathavewell-recognizedhypocholester-olemic andhypoglycemicproperties,largelyattributed totheirrheologicalbehavior.Theaimofthis workwastoevaluatetheinfluenceof flour particlesizeandhydrothermaltreatmentonthepotentialnutritionalfunctionalityofbarleyrusks.Rusksweremadeusingeitheracoarse(d50350 μm) ora fine (d50 200 μm) barley flourstreamwithout(control)orwithpriorautoclavingattwo moisturelevels(11–12 and13–14%). HPLC-SEC-RIprofiles of β-glucansisolatedfrombarleyfloursandruskrevealedashiftoftheirmolecularweight(MW),fromabove1106 to 0.17–0.28106, uponruskmakingduetoendogenous β-glucanaseactivity.However,theMWofβ-glucansintheproductswaspreserveduponcompletethermalinactivationof β-glucanase,merelyby flourautoclavingat13–14% moisture.The ‘physiologicalimpact’ ofbarleyruskswasassessed bymeasuringtheamountofsolubilized β-glucans(0.5–0.7g/100grusk)andtheviscosity(2–7mPas)oftheruskextracts,usingan in vitro digestionprotocol.Bothautoclavingand increasing flourparticlesizesignificantly(po0.05)increasedtheviscosityoftherusk‘physiologicalextracts’. Furthermore,withan in vitro digestion assay,lowerenzymicstarchdegradationwasnotedforthecoarse flourruskscomparedtotheproductsmadefromthe fineflour(18–37%vs.32–53% after5hofdigestion).Flour autoclavingalsoledtosignificant(po0.05)reduction ofstarchdigestibility. Astrongnegativecorrelation(p¼0.003) betweenthedegreeofstarch enzymicdegradationandtheviscosity oftheruskextractswasfound.Overall, flourparticlesizeandautoclavingof flourcouldbekeyprocessingfactorsformakingbarley-basedbaked itemswithimprovednutritional–physiologicalfunction.
การแปล กรุณารอสักครู่..