Instituto de Ingeniería, Universidad Autónoma de Baja California, Blvd. Benito Juárez y Calle de la Normal S/N, Col. Insurgentes Este, Mexicali 21280, Baja California, Mexico.
Molecules. 2021 Mar 3;26(5):1348. doi: 10.3390/molecules26051348.
Annually, millions of tons of foods are generated with the purpose to feed the growing world population. One particular eatable is orange, the production of which in 2018 was 75.54 Mt. One way to valorize the orange residue is to produce bioethanol by fermenting the reducing sugars generated from orange peel. Hence, the objective of the present work was to determine the experimental conditions to obtain the maximum yield of reducing sugars from orange peel using a diluted acid hydrolysis process. A proximate and chemical analysis of the orange peel were conducted. For the hydrolysis, two factorial designs were prepared to measure the glucose and fructose concentration with the 3,5-DNS acid method and UV-Visible spectroscopy. The factors were acid concentration, temperature and hydrolysis time. After the hydrolysis, the orange peel samples were subjected to an elemental SEM-EDS analysis. The results for the orange peel were 73.530% of moisture, 99.261% of volatiles, 0.052% of ash, 0.687% of fixed carbon, 19.801% of lignin, 69.096% of cellulose and 9.015% of hemicellulose. The highest concentration of glucose and fructose were 24.585 and 9.709 g/L, respectively. The results highlight that sugar production is increased by decreasing the acid concentration.
每年都有数以百万吨的食物被生产出来，以满足不断增长的世界人口的需求。橙子是一种特别受欢迎的可食用品，2018 年的产量达到了 75.54 百万吨。一种利用橙皮生产生物乙醇的方法是通过发酵橙皮中产生的还原糖来实现的。因此，本工作的目的是确定使用稀酸水解法从橙皮中获得最大还原糖产量的实验条件。对橙皮进行了近似和化学分析。为了进行水解，制备了两个析因设计来测量 3,5-DNS 酸法和紫外可见分光光度法的葡萄糖和果糖浓度。因素为酸浓度、温度和水解时间。水解后，对橙皮样品进行了元素 SEM-EDS 分析。橙皮的结果为 73.530%的水分、99.261%的挥发物、0.052%的灰分、0.687%的固定碳、19.801%的木质素、69.096%的纤维素和 9.015%的半纤维素。葡萄糖和果糖的最高浓度分别为 24.585 和 9.709 g/L。结果表明，通过降低酸浓度可以提高糖的产量。
