Landim Neves Maria Isabel, Strieder Monique Martins, Vardanega Renata, Silva Eric Keven, Meireles M Angela A
LASEFI/DEA/FEA (School of Food Engineering), UNICAMP (University of Campinas) Rua Monteiro Lobato, 80 Campinas SP CEP 13083-862 Brazil
RSC Adv. 2019 Dec 23;10(1):112-121. doi: 10.1039/c9ra08265d. eCollection 2019 Dec 20.
In this study, a biorefinery for the processing of turmeric ( L.) based on clean and emerging technologies has been proposed. High-intensity ultrasound (HIUS) technology was evaluated as a promising technique for curcumin recovery aiming to improve its extraction yield and technological properties as a colorant. In addition, we evaluated the effects of process conditions on the turmeric biomass after the extractions. The process variables were the number of stages of extraction with ethanol (1, 3 and 5) and the solvent to feed ratio (S/F) of 3, 5, 7, 9 (w/w). The highest curcumin content (41.6 g/100 g extract) was obtained using 1 wash and a S/F of 5 w/w, while the highest curcumin yield (3.9 g/100 g unflavored turmeric) was obtained using 5 stages and a S/F of 7. The extracts obtained by solid-liquid extraction assisted by HIUS showed a yellow color (157 and 169 of yellowness index) more intense than those obtained by the pressurized liquid extraction technique (101 of yellowness index) and better yield results than low-pressure solid-liquid extraction (using the same processing time). Thus, it was possible to obtain a characteristic yellow colorant with high curcumin yield in a short process time (5 min of extraction) using HIUS technology. Besides that, SEM images and FTIR spectra demonstrated that the turmeric biomasses processed by HIUS technology were not degraded.
在本研究中，提出了一种基于清洁和新兴技术处理姜黄的生物精炼厂。高强度超声（HIUS）技术被评估为一种有前景的姜黄素回收技术，旨在提高其提取率和作为着色剂的技术性能。此外，我们还评估了提取后工艺条件对姜黄生物质的影响。工艺变量包括乙醇提取阶段数（1、3和5）以及溶剂与进料比（S/F）为3、5、7、9（w/w）。使用1次洗涤和S/F为5 w/w时获得了最高姜黄素含量（41.6 g/100 g提取物），而使用5个阶段和S/F为7时获得了最高姜黄素产率（3.9 g/100 g无味姜黄）。通过HIUS辅助的固液提取获得的提取物显示出比通过加压液体提取技术获得的提取物更强烈的黄色（黄度指数为157和169），并且比低压固液提取（使用相同处理时间）具有更好的产率结果。因此，使用HIUS技术可以在短工艺时间（5分钟提取）内获得具有高姜黄素产率的特征性黄色着色剂。除此之外，扫描电子显微镜（SEM）图像和傅里叶变换红外光谱（FTIR）表明，经HIUS技术处理的姜黄生物质未降解。
