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The structural properties of covered and naked barley starches and those components were investigated. β-amylosis limit(%) of covered and naked barley starches were 58.6 and 56.3%, respectively and those of their amyloses and amylopectins were 87.0, 77.7, 57.6 and 52.0%, respectively. The ratios of outer chain length ((OCL)￣) and inner chain length((ICL)￣) for amylopectins of covered and naked barley were about 2.2:1 and 2.0:1, respectively. The elution curves by Sephadex G-75 after debranching starches with pullulanase were similar patterns for two starches and yielded two peaks consisting of amylose component((dp)￣$gt;55) and bimodal amylopectin components of (dp)￣(35-45) and (dp)￣(10-20) hydrolysates. Also, hydrolysis products by sequential hydrolysis with pullulanase and β-amylase contained 0.03-0.5% non-hydrolyzed peak components of (dp)￣55. The elution profiles of β-amylase hydrolysates yielded two peaks consisting of the inner components((dp)￣$gt; 55) and the outer chain components of amylopectin((dp)￣ $lt; 10) regardless of samples. However, the (dp)￣ distributions of (dp)￣$gt;55 hydrolysates exhibited the significant differences due to the varieties.
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