青稞籽粒主要组分对其淀粉膨胀势的影响

青稞是我国藏区的主要粮食作物,其淀粉膨胀势是淀粉特性的重要指标.为明确青稞籽粒组分对青稞膨胀势的影响以及淀粉膨胀势与全麦粉膨胀势之间的关系,研究了25份青稞材料籽粒主要成分的含量差异、淀粉与全麦粉的膨胀势差异以及籽粒组分与膨胀势的关系.结果显示,青稞的蛋白质含量、β-葡聚糖含量和直链淀粉含量的平均值分别为13.83%、5.74%和27.44%,材料间差异很大,变幅分别为11.70%-16.40%、4.07%-9.70%和0.23%-37.81%.用以预测α-淀粉酶活性的降落值变异也很大,变幅为76-515 s,平均值为365.12 s.不同青稞材料的淀粉和全麦粉的膨胀势都有明显差异,淀粉膨胀势为10.45-21.03,而全麦粉为2.91-16.03.青稞籽粒不同组分对淀粉或全麦粉膨胀势的影响不同,直链淀粉抑制淀粉膨胀,β-葡聚糖含量与青稞全麦粉的膨胀势成正相关,而高α-淀粉酶活性会降低青稞粉的膨胀势.青稞全麦粉膨胀势与淀粉膨胀势呈显著正相关.本研究表明不同青稞材料的膨胀势差异较大,不同籽粒组分对膨胀势的影响不同,不同青稞全麦粉膨胀势变化趋势与其淀粉膨胀势的变化一致,因此可使用全麦粉膨胀势替代淀粉膨胀势进行青稞材料的筛选,具有方便、省时、快捷的优势

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^