Mendez-Encinas Mayra A, Carvajal-Millan Elizabeth, Ortega-García Jesús, Santiago-Gómez Lubitza B, Anda-Flores Yubia De, Martínez-Robinson Karla G, Valencia-Rivera Dora E
Biopolymers, Research Center for Food and Development (CIAD), Hermosillo, Sonora 83304, Mexico.
Department of Chemical Biological and Agropecuary Sciences, University of Sonora, Caborca, Sonora 83621, Mexico.
Antioxidants (Basel). 2020 Feb 10;9(2):147. doi: 10.3390/antiox9020147.
Arabinoxylans (AX) are polysaccharides with antioxidant activity and emulsifying properties, which make them an attractive alternative for its potential application as a natural antioxidant in oils. Therefore, this work aimed to investigate the effect of ultrasonic treatment of AX on their antioxidant capacity and its ability to improve the oxidative stability of soybean oil. For this purpose, AX were exposed to ultrasonic treatment at 25% (100 W, AX-1) and 50% (200 W, AX-2) power and an operating frequency of 20 KHz during 15 min, and their macromolecular properties (weight average molecular weight (Mw), polydispersity index and intrinsic viscosity) were evaluated. The antioxidant capacity of AX was determined by the DPPH assay and Rancimat test. Results showed that ultrasonic treatment did not affect the molecular identity of the polysaccharide but modified its Mw distribution. AX-1 showed the highest antioxidant activity (75% inhibition) at 533 µg/mL by the DPPH method compared to AX and AX-2. AX at 0.25% (/) and AX-1 at 0.01% (/) exerted the highest protective effects on oxidative stability of soybean oil with induction periods of 7.69 and 5.54 h, respectively. The results indicate that AX could be a good alternative for the potential application as a natural antioxidant in oils.
阿拉伯木聚糖（AX）是具有抗氧化活性和乳化特性的多糖，这使其成为一种有吸引力的替代品，因其有可能作为天然抗氧化剂应用于油脂中。因此，本研究旨在探讨超声处理AX对其抗氧化能力以及提高大豆油氧化稳定性能力的影响。为此，将AX在功率25%（100W，AX - 1）和50%（200W，AX - 2）、操作频率20kHz的条件下进行15分钟的超声处理，并对其大分子特性（重均分子量（Mw）、多分散指数和特性粘度）进行评估。通过DPPH法和Rancimat试验测定AX的抗氧化能力。结果表明，超声处理不影响多糖的分子特性，但改变了其Mw分布。与AX和AX - 2相比，AX - 1通过DPPH法在533μg/mL时显示出最高的抗氧化活性（75%抑制率）。0.25%的AX（/）和0.01%的AX - 1（/）对大豆油的氧化稳定性具有最高的保护作用，诱导期分别为7.69小时和5.54小时。结果表明，AX可能是作为油脂天然抗氧化剂潜在应用的良好替代品。
