Bamboo leaf polysaccharides have a variety of biological activities, such as antioxidation and immunomodulation, but their emulsifying properties have rarely been involved. In this study, polysaccharide conjugates were extracted from bamboo leaf residue under alkaline conditions, referred to as BLPC- A. BLPC-A aqueous solution and medium-chain triglycerides (MCT) were used as the raw materials to prepare oil-in-water (O/W) high internal phase emulsions (HIPEs). As a single emulsifier, BLPC-A could stabilize 80% (w/w) MCT. With the increase in the BLPC-A concentration (1.00–2.50%, w/w), the average particle size (APS) (d_3,2) of the HIPEs gradually decreased, while the viscoelasticity of the HIPEs gradually increased. Furthermore, all HIPEs had good stability during a 30-day storage period at 25 ℃. Among them, after the BLPC-A HIPEs (2.00%, w/w) underwent heat treatment at 40–90 °C, the APS (d_3,2) increased from 10.51 µm to 13.01 µm, the tightly packed structure was well maintained, and the HIPEs had good storage stability and enhanced viscoelasticity. When the BLPC-A HIPEs (2.00%, w/w) were exposed to different concentrations of Na⁺ (0.50–1.00 M) and Ca²⁺ (0.01–0.05 M), the APS (d_3,2) decreased from 8.55 µm to 7.53 µm, and increased from 10.62 µm to 36.54 µm, respectively, while the viscoelasticity was enhanced for each, though HIPEs exposed to Na⁺ had superior storage stability. These results show that BLPC-A can be used as a natural emulsifier with a good emulsifying effect, while further providing support for the effective utilization of bamboo leaf resources.

竹叶多糖具有抗氧化、免疫调节等多种生物活性，但其乳化特性却鲜有涉及。本研究在碱性条件下从竹叶渣中提取多糖结合物，简称BLPC-A。以BLPC-A水溶液和中链甘油三酯（MCT）为原料制备水包油（ O/W) 高内相乳液 (HIPE)。作为单一乳化剂，BLPC-A 可以稳定 80% (w/w) MCT。随着 BLPC-A 浓度 (1.00–2.50%, w/w) 的增加，平均粒径 (APS) (d _3,2) 的 HIPEs 逐渐降低，而 HIPEs 的粘弹性逐渐增加。此外，所有 HIPEs 在 25 ℃ 下 30 天的储存期间都具有良好的稳定性。其中，BLPC-A HIPEs (2.00%, w/w) 在 40–90 °C 进行热处理后，APS (d _3,2 ) 从 10.51 µm 增加到 13.01 µm，紧密堆积的结构得到了很好的保持, 并且 HIPEs 具有良好的储存稳定性和增强的粘弹性。当 BLPC-A HIPEs (2.00%, w/w) 暴露于不同浓度的 Na ⁺ (0.50–1.00 M) 和 Ca ²⁺ (0.01–0.05 M) 时，APS (d _3,2 ) 从 8.55 降低μm 至 7.53 μm，并分别从 10.62 μm 增加至 36.54 μm，同时粘弹性增强，尽管 HIPEs 暴露于 Na⁺具有优异的储存稳定性。这些结果表明BLPC-A可作为天然乳化剂使用，具有良好的乳化效果，同时进一步为竹叶资源的有效利用提供支持。