CHLOROPHYLL EXTRACTED FROM INDUSTRIAL WASTE FROM MATE-HERB (Ilex paraguaiensis) A POSSIBILITY OF CIRCULAR ECONOMY.

Chlorophyll is the most abundant green pigment on the planet, it is unstable and decomposes naturally. Mate-herb is a traditional native plant in the southern region of South America, and its tea is part of the local culture and extractive agriculture. The mate-herb industry generates as a by-product a resinous material rich in chlorophyll whose use is proposed to be a natural pigment. The chlorophyll extraction method uses ethanol as a solvent; its structural modification leads to the obtainment of derivatives like pheophytin, Co-pheophytin, Ni-pheophytin, and Zn-pheophytin. The samples were analyzed by electronic (VISIBLE) and vibrational (FTIR) spectroscopy, and energy-dispersive X-ray fluorescence spectrometry (EDXRF). Color analysis (CIE L*a*b*) was performed by decomposition in grayscale and the classification of the samples by the supervised machine learning (ML) algorithm Random Forest (RF), showing adequate accuracy for this type of matrix. The pigments were dispersed in synthetic enamel paint to study color stability when exposed to lighting. It was verified that Co-pheophytin and Ni-pheophytin are the most stable. The chlorophyll extracted from the resin presents an economically viable use for residues from mate-herb industries, whose family farmers benefit, with the bias of environmental and social sustainability, within the circular economy.叶绿素是地球上含量最为丰富的绿色色素，其性质不稳定，可自然分解。马黛草（Mate-herb）是南美南部地区的传统本土植物，其茶饮是当地文化与萃取农业的重要组成部分。马黛草产业会产生一种富含叶绿素的树脂状副产物，该副产物被提议用作天然色素。叶绿素的提取方法以乙醇作为溶剂，对其进行结构改性可得到脱镁叶绿素（pheophytin）、钴脱镁叶绿素（Co-pheophytin）、镍脱镁叶绿素（Ni-pheophytin）以及锌脱镁叶绿素（Zn-pheophytin）等衍生物。 研究采用可见光谱（VISIBLE）、傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy，FTIR）以及能量色散X射线荧光光谱法（Energy-dispersive X-ray Fluorescence Spectrometry，EDXRF）对样品进行分析。通过灰度分解开展CIE L*a*b*颜色分析，并采用监督式机器学习（supervised machine learning，ML）算法随机森林（Random Forest，RF）对样品进行分类，该方法针对此类基质展现出良好的分类精度。 将上述色素分散于合成磁漆中，研究其在光照条件下的颜色稳定性。经实验验证，钴脱镁叶绿素与镍脱镁叶绿素的稳定性最为优异。从该树脂副产物中提取的叶绿素，可实现马黛草产业残余物的经济化利用，惠及当地家庭农场，契合循环经济框架下的环境与社会可持续发展理念。