https://scholars.lib.ntu.edu.tw/handle/123456789/414044
標題: | Interference prevention in size-exclusion chromatographic analysis of debranched starch glucans by aqueous system | 作者: | Lin A.H.-M. Chang Y.-H. Chou W.-B. Lu T.-J. |
關鍵字: | ammonium sulfate;amylopectin;amylose;chain-length distribution;ionic interaction;refractive index increment dn/dc;size-exclusion chromatography;starch | 公開日期: | 2011 | 卷: | 59 | 期: | 11 | 起(迄)頁: | 5890-5898 | 來源出版物: | Journal of Agricultural and Food Chemistry | 摘要: | Branch chain-length distribution of amylopectin plays an important role on the characteristics of starch. One of the adapted protocols for determining the chain-length distribution and mass proportion of starch molecules is that starch is debranched with isoamylase and then analyzed by using high-performance size-exclusion chromatography coupled with multiangle laser-light scattering and refractive index detection (HPSEC-MALS-RI). However, ammonium sulfate in commercial isoamylase and acetate in debranching buffer give significant interferences on the chromatograms because of their undesirable ionic interactions with column sorbent materials. This study deals with development for correcting those interferences. A weak anion-exchange resin or selective precipitation with barium acetate was employed to remove sulfate prior to HPSEC determination. The interference of acetate was overcome by means of high ionic strength eluent, 0.3 M sodium nitrate. The specific refractive index increment (dn/dc) of amylodextrin was determined to be 0.147 using the modified conditions and was applied to calculate the molecular weight distribution of debranched starch molecules. ? 2011 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/414044 | ISSN: | 00218561 | DOI: | 10.1021/jf104393q |
顯示於: | 食品科技研究所 |
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