Physicochemical characterization of ulvan films modified with carnauba wax for enhanced hydrophobicity

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL
Luíza Schmitz, Diego Serrasol do Amaral, Orestes Estevam Alarcon
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Abstract

This study describes the development of ulvan films blended with selected concentrations of carnauba (Copernicia prunifera) wax (0%, 5%, 10% and 15% w/w) to modify its hydrophilic nature. The effects of carnauba wax on the physical, chemical, and mechanical properties of the films were studied. Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectrum evidenced the presence of uronic acid carboxyl groups, ester sulfate groups, and the vibrational modes associated with C-O groups in the glycosidic linkage between rhamnose and glucuronic acid, which constitute the characteristic ulvan bands. Higher wax concentrations led to lower intensity of transmission peaks in the range of 3500 cm-1 to 3200 cm-1, indicating an increase in the films' hydrophobicity. This enhanced hydrophobicity is further supported by contact angle measurements, where the wax-free film (CC0) exhibited a contact angle of 51.85 ± 1.61° (hydrophilic), while the film with 15% wax (CC15) showed a contact angle of 66.64 ± 2.15° (hydrophobic). Additionally, a maximum reduction in the solubility of films with 10% carnauba wax compared to wax-free films. Meanwhile, both tensile strength and elongation at break show negligible changes regardless of carnauba wax presence. The findings indicate that carnauba wax-enriched ulvan films enhance hydrophobicity without compromising mechanical integrity, highlighting its potential for use in food packaging applications.

Graphical Abstract

Abstract Image

Abstract Image

用棕榈蜡改性以增强疏水性的乌尔凡薄膜的物理化学特征
本研究介绍了掺入特定浓度棕榈蜡(Copernicia prunifera)(0%、5%、10% 和 15% w/w)以改变其亲水性的 ulvan 薄膜的开发过程。研究了棕榈蜡对薄膜物理、化学和机械性能的影响。衰减全反射傅立叶变换红外光谱(ATR-FTIR)显示了尿酸羧基、硫酸酯基的存在,以及鼠李糖和葡萄糖醛酸之间糖苷键中与 C-O 基团相关的振动模式,这些振动模式构成了特征性的 ulvan 带。蜡浓度越高,3500 cm-1 至 3200 cm-1 范围内的透射峰强度越低,表明薄膜的疏水性越强。无蜡薄膜(CC0)的接触角为 51.85 ± 1.61°(亲水),而含 15% 蜡的薄膜(CC15)的接触角为 66.64 ± 2.15°(疏水)。此外,与不含蜡的薄膜相比,含 10%棕榈蜡的薄膜的溶解度降低幅度最大。同时,无论是否含有棕榈蜡,拉伸强度和断裂伸长率的变化都微乎其微。研究结果表明,富含棕榈蜡的溃凡薄膜在不影响机械完整性的情况下增强了疏水性,突出了其在食品包装应用中的潜力。
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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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