Residues from orange processing are being continuously generated in vast amounts due to the increasing demand for this fruit and its byproducts worldwide. The valorization of Orange Residues is challenging in contrast to conventional “lignocellulosic residues” since this fruit-derived biomass contains high amounts of pectin and an extractive fraction rich in sugars, essential oils, and polyphenols. The relative amounts of these fractions are highly influenced by the juice/pulp extraction process. Even though several studies have explored how to produce added value from this biomass, it is necessary to compare how different techniques and operating conditions influence the bioactive compounds that can be recovered and the remnant biomass after processing. This study compares essential oil extraction, solvent extraction, and acid hydrolysis for fermentable sugar and pectin production to elucidate a feasible sequence for a biorefinery from Orange Residues. From our results, it was proposed a technically feasible sequence that maximizes the yields of i) essential oils (0.70 ± 0.05 g/ 100 g DM) from steam distillation (4 h, 1500 W), ii) naringin (0.19 g/100 g DM), hesperidin (1.27 g/100 g DM), and glucose (3.9 g/100 g DM) from solid-liquid extraction (Ethanol 61.6 % (w/v), 45.8 °C, 155.5 min, and 5 % (w/v) biomass load), iii) pectin (25.24 g/100 g DM) from citric acid hydrolysis (pH 1.5, 90 °C, 82.1 min, and 5 % (w/v) biomass load), and iv) glucose (12.41 g/100 g DM) and xylose (10.13 g/100 g DM) from sulfuric acid hydrolysis (Sulfuric acid 0.68 % (w/v), 121 °C, 24.1 min, and 7.32 % (w/v) biomass load), in a biorefinery scheme.

中文翻译：

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从橙子残留物中回收精油、多酚、可发酵糖和果胶：提取方法的评估和增值生物活性化合物的表征


由于全球对橙子及其副产品的需求不断增加，橙子加工产生的残留物不断产生。与传统的“木质纤维素残留物”相比，橙子残留物的价值化具有挑战性，因为这种水果来源的生物质含有大量的果胶和富含糖、精油和多酚的萃取部分。这些馏分的相对量受果汁/果肉提取过程的影响很大。尽管已经有几项研究探讨了如何从这种生物质中产生附加值，但有必要比较不同的技术和操作条件如何影响可回收的生物活性化合物和加工后的残余生物质。本研究比较了精油提取、溶剂提取和酸水解用于可发酵糖和果胶生产，以阐明从橙渣中进行生物精炼的可行顺序。根据我们的结果，提出了一个技术上可行的序列，该序列最大限度地提高了 i） 蒸汽蒸馏（0.70 ± 0.05 g/100 g DM）的产量（4 h，1500 W），ii） 柚皮苷（0.19 g/100 g DM），橙皮苷（1.27 g/100 g DM）和葡萄糖（3.9 g/100 g DM）来自固液萃取（乙醇 61.6 % （w/v）， 45.8 °C，155.5 分钟，生物质载量为 5 %（w/v），iii） 柠檬酸水解产生的果胶（25.24 g/100 g DM）（pH 1.5,90 °C，82.1 分钟，生物质载量为 5 %（w/v），以及 iv）硫酸水解产生的葡萄糖（12.41 g/100 g DM）和木糖（10.13 g/100 g DM）（硫酸 0.68 % （w/v）， 121 °C，24.1 分钟和 7.32 % （w/v） 生物质负荷），在生物精炼方案中。