Purification and identification of an antioxidant peptide from Pinctada fucata muscle
文献类型: 外文期刊
第一作者: Wu, Yanyan
作者: Wu, Yanyan;Wang, Jing;Li, Laihao;Yang, Xianqing;Wang, Jinxu;Hu, Xiao;Wang, Jing
作者机构:
关键词: Pinctada fucata muscle; antioxidant peptide; purification; antioxidant activity; structure
期刊名称:CYTA-JOURNAL OF FOOD ( 影响因子:2.255; 五年影响因子:2.381 )
ISSN: 1947-6337
年卷期: 2018 年 16 卷 1 期
页码:
收录情况: SCI
摘要: Pinctada fucata muscles were hydrolysed by alcalase and filtered using ultrafiltration membranes to obtain peptides with molecular weights (MWs) less than 5kDa. The percolate was then freeze-dried and named crude antioxidant peptides mixture from Pinctada fucata muscles (AOP). In this study, AOP was purified sequentially using sephadex gel chromatography, next reversed-phase high-performance liquid chromatography. The MW of the antioxidant peptide from P. fucata muscle was 1039.56Da. The amino acid sequence was Gly-Ala-Gly-Leu-Pro-Gly-Lys-Arg-Glu-Arg based on matrix-assisted laser desorption ionization mass spectrometry (MALDI-TOF). The natural peptide exhibits good scavenging capacity against free radicals; the IC50 of scavenging 2,2-diphenyl-1-picrylhydrazyl and .OH of FC2 were closer to vitamin C and butylated hydroxytoluence; however, the IC50 values of of FC2 were a bit poor. Its antioxidant activity was attributed to the hydrophobic amino acid residues enriched in the N-terminal and electrophilic ability mediated by Glu and electron acceptors such as Lys and Arg. The synthesized peptide exhibited a reduced ability to scavenge free radicals compared to the natural peptide. The proposed method is a feasible technique to prepare antioxidant peptides from P. fucata and could be useful to obtain ingredients in nutraceutical and cosmetic applications. RESUMENMediante el uso de alcalasa y filtrados se hidrolizaron musculos de Pinctada fucata, empleandose membranas de ultrafiltracion con el objetivo de obtener peptidos cuyos pesos moleculares fueran inferiores a 5 kDa. Posteriormente, se liofilizo el percolado obtenido y se lo nombro como AOP. En el presente estudio, el AOP fue purificado secuencialmente utilizando cromatografia de gel sephadex y cromatografia liquida de alta resolucion de fase inversa (RP-HPLC). El peptido antioxidante procedente de musculos de Pinctada fucata registro un peso molecular de 1039,56 Da. Su secuencia de aminoacidos, determinada mediante la espectrometria de masas MALDI-TOF, fue Gli-Ala-Gli-Leu-Pro-Gli-Lis-Arg-Glu-Arg. El peptido natural obtenido muestra una buena capacidad de eliminacion de radicales libres: la IC50, con capacidad de eliminar DPPH y OH de FC2, resulto ser mas cercana a la vitamina C (Vc) y al butihidroxianisol (BHT); sin embargo, en el caso de O-2(-) de FC2 los valores de IC50 fueron mas bajos. Su actividad antioxidante puede atribuirse a los residuales de aminoacidos hidrofobicos enriquecidos en el extremo N-terminal Su capacidad electrofilica fue mediada por Glu y aceptadores de electrones como Lis y Arg. En comparacion con el peptido natural, el peptido sintetizado mostro menos capacidad para eliminar radicales libres. El estudio permitio constatar que el metodo propuesto constituye una tecnica viable para preparar peptidos antioxidantes de Pinctada fucata, lo que puede ser util para obtener ingredientes en sus aplicaciones nutraceutica y cosmetica.
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