Celik Sudenur, Kutlu Gozde, Tornuk Fatih
Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering Yildiz Technical University Istanbul Türkiye.
Department of Gastronomy and Culinary Arts, Faculty of Fine Arts, Design and Architecture Ankara Medipol University Ankara Türkiye.
Food Sci Nutr. 2024 Sep 2;12(10):8364-8376. doi: 10.1002/fsn3.4439. eCollection 2024 Oct.
In the present work, cellulose microfibers (CMFs) isolated from fallen autumn leaves of cherry plum (), white mulberry ( and plane () trees were characterized and used as reinforcement agents in sodium alginate-based biodegradable films. Fourier transform infrared spectroscopy (FT-IR) characterization showed that the CMFs were successfully isolated from the leaves with high purity. The extracted CMFs had a particle size ranging from 321.20 nm to 632.26 nm and negative zeta potential values (-27.33 to -21.40). The extraction yield of CMFs ranged from 19.53% to 26.00%. Incorporation of the leaf-derived CMFs into sodium alginate based films (1%, w:w) increased their tensile strength (from 153.73 to 187.78 MPa) and elongation at break values (from 105.97% to 89.90%) and significantly decreased oxygen (from 121.46 to 75.56 meq kg) and water vapor permeabilities (from 2.36 to 1.60 g mm h m kPa)( < 0.05). Furthermore, the supplementation of CMFs into the biopolymer matrix had no significant effect on the color ( 85.35-85.67; -0.75-0.71; : 4.23-4.94) and moisture content (44.64-48.42%) of the film samples, although the thickness increased (40.33-94.66 μm). Scanning electron microscopy (SEM) images showed that CMFs were homogeneously dispersed in the film matrix. Overall, this study confirms that fallen cherry plum, white mulberry, and plane leaves are valuable sources of CMFs which could be used in the manufacturing of biodegradable nanocomposite films as reinforcement agents.
在本研究中，对从樱桃李、白桑和悬铃木的落叶中分离出的纤维素微纤维（CMFs）进行了表征，并将其用作海藻酸钠基可生物降解薄膜的增强剂。傅里叶变换红外光谱（FT-IR）表征表明，CMFs已成功从叶片中分离出来，纯度很高。提取的CMFs粒径范围为321.20至632.26nm，zeta电位值为负（-27.33至-21.40）。CMFs的提取率范围为19.53%至26.00%。将源自叶片的CMFs掺入海藻酸钠基薄膜（1%，w:w）中，提高了其拉伸强度（从153.73MPa提高到187.78MPa）和断裂伸长率值（从105.97%提高到89.90%），并显著降低了氧气透过率（从121.46降低到75.56meq kg）和水蒸气透过率（从2.36降低到1.60g·mm·h⁻¹·m⁻²·kPa⁻¹）（P<0.05）。此外，尽管薄膜样品的厚度增加了（40.33至94.66μm），但向生物聚合物基质中添加CMFs对薄膜样品的颜色（L*：85.35 - 85.67；a*：-0.75至0.71；b*：4.23至4.94）和水分含量（44.64至48.42%）没有显著影响。扫描电子显微镜（SEM）图像显示，CMFs均匀地分散在薄膜基质中。总体而言，本研究证实，樱桃李、白桑和悬铃木的落叶是CMFs的宝贵来源，可作为增强剂用于制造可生物降解的纳米复合薄膜。
