Tasnim Khandoker Tahmina, Debnath Akash, Uddin Md Tushar, Alam Md Ashraful, Razzaq Md Abdur, Zaman Sk Zubaer, Shaikh Md Aftab Ali, Mondal Ajoy Kanti
Leather Research Institute, Bangladesh Council of Scientific and Industrial Research, Savar, Dhaka 1350, Bangladesh.
Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh.
Heliyon. 2024 May 23;10(11):e31787. doi: 10.1016/j.heliyon.2024.e31787. eCollection 2024 Jun 15.
Utilization of vegetable tannins in leather processing is one of the convenient solutions to protect the environment pollution. Herein, the banana bunch and syrup of banana stem are utilized to prepare an ecofriendly tanning agent. The yield of banana bunch extraction efficiency is found 69.80 %. FT-IR analysis confirmed the presence of condensed type tanning component owing to the bearing of different polyphenolic groups. The content of tannins in extracted banana bunch and stem syrup is 3.13 % and 2.6 %, respectively. The phenolic content in the banana bunch extract is determined to be 1332.37 mg GAE/100g of dried weight and in syrup was 873.92 mg GAE/100g of dried weight. This makes it possible to be used as vegetable tanners. The extracted bunch and syrup are applied to re-tan leather and compared with conventionally used vegetable tanning agent (quebracho) in parallel. Tensile strength, tear strength and elongation percentage for the extracted banana bunch and syrup are obtained at 23.84 N/mm, 68.26 N/mm, 47.07 %, and 22.97 N/mm, 68.38 N/mm, 40.70 %, respectively. The softness is found 1.41 for the extracted bunch and 2.01 for the syrup. The grain crack load, distension at grain crack, strength at ball burst, distension at ball burst are 246.86 N, 13.24 mm, 530.77 N, 24.54 mm for banana stem syrup and 338.77 N, 13.42 mm, 460.65 N, 29.08 mm for bunch extract, respectively. The shrinkage temperatures recorded for banana bunch extract, syrup and Quebracho (control trial) tannins tanned leather samples are 76.5 °C, 75 °C and 84 °C subsequently. The flexing endurance of the bunch extract and syrup revealed acceptable values that are less than 4. Moreover, the bunch extract tanned leather shows greater thermal stability and for syrup it is similar with the quebracho tanned leather. All the results are satisfactory compared to the control trial. Finally, tanned leather is evaluated to assess the possibility of the newly developed tannin which proves its efficiency as a potential source of tanning material for the leather industry.
在皮革加工中使用植物单宁是保护环境免受污染的便捷解决方案之一。在此，香蕉束和香蕉茎糖浆被用于制备一种环保鞣剂。发现香蕉束提取物的得率为69.80%。傅里叶变换红外光谱（FT - IR）分析证实，由于含有不同的多酚基团，存在缩合型鞣质成分。提取的香蕉束和茎糖浆中单宁的含量分别为3.13%和2.6%。香蕉束提取物中的酚含量经测定为1332.37mg没食子酸当量/100g干重，糖浆中的酚含量为873.92mg没食子酸当量/100g干重。这使得它们有可能用作植物鞣剂。将提取的香蕉束和糖浆应用于皮革复鞣，并与传统使用的植物鞣剂（坚木）进行平行比较。提取的香蕉束和糖浆的拉伸强度、撕裂强度和伸长率分别为23.84N/mm、68.26N/mm、47.07%，以及22.97N/mm、68.38N/mm、40.70%。发现提取的香蕉束的柔软度为1.41，糖浆的柔软度为2.01。香蕉茎糖浆的粒面裂纹负荷、粒面裂纹时的膨胀、皮球爆破强度、皮球爆破时的膨胀分别为246.86N、13.24mm、530.77N、24.54mm，香蕉束提取物的分别为338.77N、13.42mm、460.65N、29.08mm。香蕉束提取物、糖浆和坚木（对照试验）单宁鞣制的皮革样品记录的收缩温度分别为76.5°C、75°C和84°C。香蕉束提取物和糖浆的耐折牢度显示出可接受的值，均小于4。此外，香蕉束提取物鞣制的皮革显示出更高的热稳定性，而糖浆鞣制的皮革与坚木鞣制的皮革相似。与对照试验相比，所有结果都令人满意。最后，对鞣制皮革进行评估，以评估新开发的单宁作为皮革工业潜在鞣制材料来源的效率，结果证明了其有效性。
