菠萝皮渣纤维素纳米晶的制备及其在Pickering乳液中的环境稳定性  

Preparation of Pineapple Peel Cellulose Nanocrystals and Their Environment Stability in Pickering Emulsions

作　　者：黄惠华[1] 唐璐 刘钰姗 廖晶 陈星宇 肖敏萱 尹惠双 HUANG Huihua;TANG Lu;LIU Yushan;LIAO Jing;CHEN Xingyu;XIAO Minxuan;YIN Huishuang(School of Food Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)

机构地区：[1]华南理工大学食品科学与工程学院,广东广州510640 [2]广东工业大学轻工化工学院,广东广州510006

出　　处：《华南理工大学学报（自然科学版）》2022年第8期1-11,共11页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(32172132,31471673)。

摘　　要：近年来,随着菠萝销量的逐渐增加,菠萝皮渣的资源浪费问题亟待解决。菠萝皮渣中富含不溶性纤维素,这为菠萝皮渣中提取的纤维素的衍生化发展提供了可能性。为了探究菠萝皮渣在纤维素纳米晶制备和应用方面的潜力,文中利用硫酸水解法和2,2,6,6-四甲基哌啶(TEMPO)氧化法分别制备了菠萝皮渣纤维素纳米晶PPeNc和PTNc,并将其应用于Pickering乳液(制得PPeNc-P和PTNc-P)进行环境稳定性研究。傅里叶变换红外光谱、X-射线衍射和热重分析发现,PPeNc和PTNc均保留了纤维素的结构特征,但PTNc的结晶度和热稳定性更低;原子力显微观察显示,PTNc的纵横比高达54.11,对比PPeNc而言,PTNc具有纵横比更高、直径更长的特点。研究发现,在pH=2~12范围内,离子强度小于70mmol/L或油水比低于5∶5时,PTNc-P稳定性均高于PPeNcP。贮存实验发现,PPeNc-P的贮存期在70d以内,而PTNc-P能够稳定贮存5个月以上。文中研究结果表明,通过TEMPO氧化法制备的纤维素纳米晶在稳定Pickering乳液方面具有更大潜力,这为PTNc在Pickering乳液中的贮存和进一步应用提供了理论依据,有利于实现菠萝皮渣的高值化利用。In recent years,with the gradual increase of pineapple sales,the resource waste problem of pineapple peel needs to be urgently solved.Pineapple peel residue is rich in insoluble cellulose,which provides a possibility for the derivative development of cellulose extracted from pineapple peel residue.In order to discuss the potential in the preparation and application of pineapple peel cellulose nanocrystals(PCNCs),this paper prepared pineapple peel residue cellulose nanocrystals PPeNc and PTNc by sulfuric acid hydrolysis and 2,2,6,6-tetramethylpiperidine oxide(TEMPO)oxidation,respectively,and applied them to the Pickering emulsion(made into PPeNc-P and PTNc-P)for the environmental stability study.Fourier transform infrared spectroscopy,X-ray diffraction and thermal gravimetric analysis show that both PPeNc and PTNc retain the original structure of cellulose,but the crystallinity and thermal stability of PTNc are lower than those of PPeNc.Atomic force microscopy show that the aspect ratio of PTNc is as high as 54.11.As compared with PPeNc,PTNc exhibits higher aspect ratio and longer diameter.Furthermore,it is found that the stability of PTNc-P is better than that of PPeNc-P in the range of pH=2~12,and the ionic strength is below 70 mmol/L or the oil-water ratio is below 5∶5.The storage experiment shows that the storage period of PPeNc-P is within 70 days,while PTNc-P can be stored stably for more than five months.The research results in this paper indicate that PCNCs prepared by TEMPO oxidation show greater potential in stabilizing Pickering emulsion,which provides a theoretical basis for the storage and further application of PTNc in Pickering emulsion.It is conducive to realizing the high-value utilization of pineapple peel residue.

关 键 词：菠萝皮渣 纤维素纳米晶 Pickering乳液 稳定性 2 2 6 6-四甲基哌啶氧化 

分 类 号：TS209[轻工技术与工程—食品科学]