Navarro-Abarca Úrsula, Ayala-Gonzales Mara, Jorge-Montalvo Paola, Visitación-Figueroa Lizardo
Center for Research in Chemistry, Toxicology and Environmental Biotechnology, Department of Chemistry, Faculty of Science, Universidad Nacional Agraria La Molina, 15024, Lima, Peru.
Heliyon. 2024 Jun 18;10(12):e33285. doi: 10.1016/j.heliyon.2024.e33285. eCollection 2024 Jun 30.
Valorization of residual yeast of the bakery industry for use in the remediation of oil-contaminated soils as an emulsifier is a biocompatible and effective process that will reduce environmental pollution. The aim of this study was to use concentrated β-glucan obtained from residual baker's yeast, , as an emulsifier to remove total petroleum hydrocarbons (TPH) from the contaminated sands of two beaches affected by the oil spill that occurred in January 2022 north of Lima, Peru. The extraction and concentration of β-glucan from sand were performed at a pilot scale using autolysis with 3 % sodium chloride, temperature elevation, treatment with organic solvents and water, hydrolysis via proteases, and vacuum filtration. The chemical composition and functional properties of concentrated β-glucan were evaluated to determine its quality and efficacy. In addition, the values of TPH removal efficiency obtained using concentrated β-glucan, water, and the commercial emulsifier Tween-80 were compared. The mass recovery of concentrated β-glucan was 5.59 %, with a β-glucan content of 38.60 %. The efficiency of ex-situ removal of TPH from hydrocarbon-impacted sands containing 78323 mg/kg of TPH reached 50 % and 70 % when the concentrated β-glucan concentrations used were 70.3 % and 80.3 %, respectively. These efficiency values are higher than those obtained when water was used for TPH removal but lower than those obtained when Tween-80 was used for TPH removal.
将烘焙行业的残余酵母用作乳化剂用于修复受石油污染的土壤是一种生物相容且有效的过程，这将减少环境污染。本研究的目的是使用从残余面包酵母中获得的浓缩β-葡聚糖作为乳化剂，从秘鲁利马北部2022年1月发生漏油事故影响的两个海滩的受污染沙子中去除总石油烃（TPH）。使用3%氯化钠自溶、升温、有机溶剂和水处理、蛋白酶水解以及真空过滤等方法在中试规模下从沙子中提取和浓缩β-葡聚糖。对浓缩β-葡聚糖的化学成分和功能特性进行评估以确定其质量和功效。此外，比较了使用浓缩β-葡聚糖、水和商业乳化剂吐温80获得的TPH去除效率值。浓缩β-葡聚糖的质量回收率为5.59%，β-葡聚糖含量为38.60%。当使用的浓缩β-葡聚糖浓度分别为70.3%和80.3%时，从含78323mg/kg TPH的受烃污染沙子中异位去除TPH的效率分别达到了50%和70%。这些效率值高于用水去除TPH时获得的值，但低于用吐温80去除TPH时获得的值。
