Cason Cameron, Yemmireddy Veerachandra K, Moreira Juan, Adhikari Achyut
School of Nutrition and Food Sciences, Louisiana State University AgCenter, 261 Knapp Hall, Baton Rouge, LA 70803, USA.
School of Earth, Environmental, and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA.
Foods. 2021 Mar 27;10(4):713. doi: 10.3390/foods10040713.
Pecan shells are a rich source of various bioactive compounds with potential antioxidant and antimicrobial properties. This study investigated the effect of pecan variety and method extraction on the antioxidant property of shell extracts. Twenty different varieties of pecan shells were subjected to either aqueous or ethanolic extraction and were examined for total phenolics and antiradical activity. The phenolic content and antiradical activity of shell extracts were significantly ( < 0.05) varied with different pecan cultivars. The total phenolic content of ethanol extracts ranged from 304.2 (Caddo) to 153.54 (Cherokee) mg GAE/g of dry extract and was significantly greater ( 0.05) than those obtained by aqueous extraction. The antiradical activity of ethanol extracts ranged from 840.6 (Maramec) to 526.74 (Caper Fear) mg TEg, while aqueous extracts ranged from 934.9 (Curtis) to 468.3 (Elliot) mg TEg. Chemical profiling of the crude and acid hydrolyzed extracts was performed by reverse phase high performance liquid chromatography and flow injection electrospray ionization mass spectrometry. Lignin degradation products such as lignols, dilignols, trilignols, and oligolignols were found to be the major components of tested extracts. Phenolic content and antiradical activity of pecan shell extracts are significantly varied with cultivars and methods of extraction.
山核桃壳是多种具有潜在抗氧化和抗菌特性的生物活性化合物的丰富来源。本研究调查了山核桃品种和提取方法对壳提取物抗氧化性能的影响。对20个不同品种的山核桃壳进行水提或醇提，并检测其总酚含量和抗自由基活性。壳提取物的酚含量和抗自由基活性因不同的山核桃品种而有显著差异（<0.05）。乙醇提取物的总酚含量范围为304.2（卡多）至153.54（切罗基）mg GAE/g干提取物，显著高于（0.05）水提物。乙醇提取物的抗自由基活性范围为840.6（马拉梅克）至526.74（卡珀费尔）mg TE/g，而水提取物的范围为934.9（柯蒂斯）至468.3（埃利奥特）mg TE/g。通过反相高效液相色谱和流动注射电喷雾电离质谱对粗提物和酸水解提取物进行化学分析。发现木质素降解产物如木质醇、二木质醇、三木质醇和低聚木质醇是测试提取物的主要成分。山核桃壳提取物的酚含量和抗自由基活性因品种和提取方法的不同而有显著差异。
