Abstract Delonix regia galactomannan (DRGM) hydrolysates were blended with k-Carrageenan (k-Carr) to evaluate the DRGM molecular weight (Mw) reduction effect and the interaction between the polysaccharides on the properties of film forming solution (FFS) and edible films produced thereof. The DRGM Mw was enzymatically reduced obtaining 3 fractions: high (HMWH), medium (MMWH), and low (LMWH) Mw hydrolysates. The FFSs viscosity was lower as the DRGM Mw decreased. The addition of k-Carr to the DRGM showed evident interaction between them, since they formed gels at lower temperature than k-Carr. The MMWH FFS blend apparent viscosity (0.044 Pa s) was higher than the MMWH (0.029 Pa s) and k-Carr (0.023 Pa s) FFSs at 10 s−1 shear rate. Moreover, the moduli, gelling and melting temperatures decreased compared with the k-Carr FFS gel. From the FFS, colorless and transparent galactomannan-based films were obtained that turned to a slightly yellow color when blended with k-Carr. The galactomannan interaction with k-Carr was identified by the shift on some FTIR bands. On other hand, the Mw reduction increases the films solubility from 69.10% to 76.08% and when blended with k-Carr the solubility reaches 100%. The water vapor permeability (WVP) of native DRGM film increased from 7.55 × 10−11 g/(m*s*Pa) to 12.62 × 10−11 g/(m*s*Pa) for HMMH and MMWH films, respectively, although the LMWH WVP decreases to 9.60 × 10−11 g/(m*s*Pa). In all cases it was found that the k-Carr blended with the DRGM hydrolysates decrease the WVP of the films. Finally, although the FFSs rheological properties decreased by Mw reduction, the films mechanical properties did not show significant changes.

中文翻译：

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Delonix regia 半乳甘露聚糖可食用薄膜：分子量和 k-卡拉胶对理化性质的影响

摘要 Delonix regia galactomannan (DRGM) 水解产物与 k-卡拉胶 (k-Carr) 混合，以评估 DRGM 分子量 (Mw) 降低效果以及多糖之间对成膜溶液 (FFS) 和可食用薄膜性能的相互作用。其中。DRGM Mw 被酶促降低，得到 3 个部分：高 (HMWH)、中 (MMWH) 和低 (LMWH) Mw 水解产物。随着 DRGM Mw 的降低，FFS 的粘度降低。将 k-Carr 添加到 DRGM 中显示出它们之间明显的相互作用，因为它们在比 k-Carr 更低的温度下形成凝胶。在 10 s-1 剪切速率下，MMWH FFS 共混物表观粘度 (0.044 Pa s) 高于 MMWH (0.029 Pa s) 和 k-Carr (0.023 Pa s) FFS。此外，与 k-Carr FFS 凝胶相比，模量、胶凝温度和熔融温度降低。来自 FFS，获得了无色透明的基于半乳甘露聚糖的薄膜，当与 k-Carr 混合时，该薄膜会变成淡黄色。半乳甘露聚糖与 k-Carr 的相互作用是通过一些 FTIR 波段的位移来确定的。另一方面，Mw 降低使薄膜溶解度从 69.10% 增加到 76.08%，当与 k-Carr 混合时，溶解度达到 100%。对于 HMMH 和 MMWH 薄膜，天然 DRGM 薄膜的水蒸气渗透率 (WVP) 从 7.55 × 10−11 g/(m*s*Pa) 分别增加到 12.62 × 10−11 g/(m*s*Pa)，尽管 LMWH WVP 降至 9.60 × 10−11 g/(m*s*Pa)。在所有情况下，发现与 DRGM 水解产物混合的 k-Carr 降低了薄膜的 WVP。最后，尽管 FFS 的流变性能因 Mw 降低而降低，但薄膜的机械性能并未显示出显着变化。