Effects of multiple‐step cold plasma processing on banana (Musa sapientum) starch‐based films

Abstract

In recent years, films of biodegradable materials have been studied to determine and improve their physical properties, mechanical strength, and hydrophobicity. This research focused on the study of banana starch-based films (Musa sapientum). The films were prepared using the casting method, and a 2k experimental design was conducted to evaluate the effects of cold plasma treatment on three steps of film production. Dielectric barrier discharge (DBD) plasma (excitation frequency of 400 Hz, voltage of 20 kV, and 15 min of processing time) was applied in three processing phases: on the starch granules, the filmogenic suspension, and the film. Plasmatreated films presented better short-range order structure degree (or crystalline/ amorphous ratio) than untreated films. Significant differences were observed on the surface of the films, especially when the filmogenic suspension or the film were subjected to plasma treatment. Films produced with the treated starch granules and filmogenic suspension presented the lowest values of moisture (<9.5%) and solubility (<31.1%), while the films produced with DBD plasma-treated starch granules and also subjected to plasma treatment presented the highest water contact angle (65.1 ), the highest tensile strength (9.11 MPa), and good puncture resistance (0.33 MPa), resulting in the highest hydrophobicity and highest mechanical strength among the tested films. Research must be done to adapt these promising results and apply to other techniques and botanical sources.

Research progress of starch from characteristic tropical crops

“…共混材料主要包括抗菌物质(如姜黄素 [291] )、芦荟凝胶 [286,291,292] 、纳米颗粒 [293] 、 多糖 [286,292] 、乙烯 [294] 等, 淀粉改性主要涉及氧化 [295] 、酯化 [291] 、酶改性 [293] , 此外, 对膜进行冷等离子体处 理可以提高膜材料的性能 [296] . [213][214][215] -原料 面包、饼干等 [216,217] 与其他淀粉混合或者对木薯淀粉进行改性: 交联和氧化 [217] 、羟丙基改性 [218] 、辛烯基琥珀酸酐改性 [219] 、 、乙酰化 [220,221] 、磷酸交联改性 [220,221] 、预 糊化改性 [221] 、酯化改性 [222,225] 、酶法协同超声改性 [223] 、微波处理改性 [224] 和机械活化改性 [226][227][228] 生物乙醇、糖浆 常规方法(干磨法破坏淀粉颗粒, 然后液化和同步糖化和发酵) [229] 、颗粒淀 粉水解法 [229] 、 顺序催化混合研磨和热水解工艺 [230] 、 酶的固定化技术 [231,232] 、 生物反应器技术 [232,233] 等 塑料、薄膜和水凝胶 制作方法主要有流延法 [234] 、热熔挤出法 [235] 、溶剂浇铸法 [236] 和溶剂置换法 [237] 所用原料的相关技术主要有共混技术等; 淀粉改性主要涉及化学改性和物 理改性, 如交联改性 [259] 、氧化改性 [260] 、酯化改性 [259] 、预糊化…”

Effect of Ball-Milling on Starch Crystalline Structure, Gelatinization Temperature, and Rheological Properties: Towards Enhanced Utilization in Thermosensitive Systems

“…No uncharacteristic band appeared, which indicates that the energy involved in the milling process did not cause the addition or removal of any chemical groups [15,24,25]. The ratio between the intensity of 995/1044 cm −1 bands was used as an indicator of the ordered structure of the starch [26]. These ratios are shown in Table 1.…”

Influence of Dielectric Barrier Discharge Cold Plasma Treatment on Starch, Gelatin, and Bacterial Cellulose Biodegradable Polymeric Films

“…Improvements on polymeric films can be carried out by several techniques, such as cold plasma [ 10 ], ultrasonics [ 11 ], doping with additives [ 12 ], production of composites [ 13 ], and other procedures. In this study, we have applied cold plasma technology to induce changes to starch, gelatin, and bacterial cellulose films.…”

“…Plasma increases carbonyl and carboxyl groups, resulting in improved paste viscosity, hydration properties, and digestibility [ 21 , 22 ]. These studies showed that the changes in starch properties were greater at excitation frequencies between 100 and 300 Hz and not at 50 Hz as commonly applied [ 10 , 21 ]. Plasma treatment in starch films also indicated that the optimal excitation frequency range was between 200 and 300 Hz [ 10 , 23 ].…”

“…Plasma treatments on bacterial cellulose and gelatin films at 50 Hz have not resulted in good improvements in film properties. Due to the importance of the excitation frequency in the generation of plasma in many applications, such as starch modification [ 10 , 21 ], aroma modulation [ 24 ], phenolics content [ 27 ], and mitigation of off-flavors [ 28 ], this work has addressed the significance of the excitation frequency in three different biodegradable polymer films.…”