Gallic Acid-Laminarin Conjugate Is a Better Antioxidant than Sulfated or Carboxylated Laminarin.

Gallic Acid-Laminarin Conjugate Is a Better Antioxidant than Sulfated or Carboxylated Laminarin.
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没食子酸-海带多糖结合物是一种比硫酸盐化或羧化海带多糖更好的抗氧化剂。

DOI:
10.3390/antiox9121192
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发表时间:
2020-11-27
期刊:
Antioxidants (Basel, Switzerland)
影响因子:
--
通讯作者:
Rocha HAO
Rocha HAO
中科院分区:
其他
文献类型:
--
作者:
Fernandes-Negreiros MM;Batista LANC;Silva Viana RL;Araujo Sabry D;Paiva AAO;Paiva WS;Machado RIA;Sousa Junior FL;de Lima Pontes D;Vitoriano JO;Alves Junior C;Lanzi Sassaki G;Rocha HAO

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从褐藻Lobophora variegata中提取了一种分子量为12.4 kDa的海带多糖(LM),该多糖由β(1→6)-支链的β(1→3)-葡聚糖组成。LMC、LMG和LMS的化学组成分析分别得到11.7%的羧基、1.5%的没食子酸和1.4%的硫酸盐含量。使用六种不同的体外方法评估天然和改性海带多糖的抗氧化活性。硫酸盐化使LM的抗氧化活性停止。羧化使库珀螯合作用提高了1.2倍。LMG被认为是一个更有效的抗氧化剂比LM的铜螯合(1.3倍),还原力(1.3倍),和总的抗氧化能力(80倍)。利用傅里叶变换红外光谱(FT-IR)和一维和二维NMR光谱分析进一步证实了没食子酸共轭。LMG也不诱导细胞死亡或影响Madin-Darby犬肾(MDCK)细胞的细胞周期。相反,LMG保护MDCK细胞免受H2 O2诱导的氧化损伤。综上所述,这些结果表明LMG具有强大的抗氧化能力,因此,在药理和功能食品中具有潜在的应用前景。
A 12.4 kDa laminarin (LM) composed of β(1→3)-glucan with β(1→6)-branches was extracted from brown seaweed Lobophora variegata and modified via carboxylation using dielectric barrier discharge (LMC), conjugation with gallic acid (LMG), and sulfation (LMS). Analyses of the chemical composition of LMC, LMG, and LMS yielded 11.7% carboxyl groups, 1.5% gallic acid, and 1.4% sulfate content, respectively. Antioxidant activities of native and modified laminarins were assessed using six different in vitro methods. Sulfation stopped the antioxidant activities of LM. On the other hand, carboxylation improved cooper chelation (1.2 times). LMG was found to be a more efficient antioxidant agent than LM in terms of copper chelation (1.3 times), reducing power (1.3 times), and total antioxidant capacity (80 times). Gallic acid conjugation was further confirmed using Fourier transform infrared spectroscopy (FT-IR) and one- and two-dimensional NMR spectroscopy analyses. LMG also did not induce cell death or affect the cell cycle of Madin–Darby canine kidney (MDCK) cells. On the contrary, LMG protected MDCK cells from H2O2-induced oxidative damage. Taken together, these results show that LMG has the potent antioxidant capacity, and, therefore, potential applications in pharmacological and functional food products.
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