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首页> 外文期刊>African Journal of Biotechnology >Lipoxygenase and carotenoids: A co-oxidation story
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Lipoxygenase and carotenoids: A co-oxidation story

机译：脂氧合酶和类胡萝卜素：共氧化的故事

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Lipoxygenases (LOXs), widely found in plants, fungi, and animals, are a large family of monomeric proteins with non-heme, non-sulphur, iron cofactor containing dioxygenases that catalyze the oxidation of polyunsaturated fatty acids such as linoleic, linolenic and arachidonic acid to yield hydroperoxides. Some LOX isoenzymes have the capacity to co-oxidise also the carotenoids. Carotenid biosynthesis occurs only in bacteria, fungi and plants where they have established functions that include their role as antenna in the light-harvesting proteins of photosynthesis, their ability to regulate light-energy conversion in photosynthesis, as well as the ability to protect the plant from reactive oxygen species, and coloration. In humans, some carotenoids (the provitamin A carotenoids: α-carotene, β-carotene, γ-carotene and the xanthophyll β-cryptoxanthin) are best known for their conversion into vitamin A.?Lipoxygenase has negative food-related implications for color, off-flavour and antioxidant status of plant based foods.?Up to now, β-carotene?seems to attract more attention in developing strategies for food processing to prevent LOX-mediated deteriorations such as oxidation, rancidity, and off-flavor. More research is necessary for transferring the?in vitro?mechanistic studies on the LOX inhibition?in vivo. Other carotenoids like lutein, zeaxanthin,?β-cryptoxanthin in pure form as well as in natural extracts could be good candidates for LOX inhibition through their antioxidant action.
机译：脂加氧酶（LOX）是广泛存在于植物，真菌和动物中的一大类单体蛋白，具有非血红素，非硫，铁辅因子的双加氧酶，可催化多不饱和脂肪酸的氧化，例如亚油酸，亚麻酸和花生四烯酸酸产生氢过氧化物。一些LOX同工酶也能共氧化类胡萝卜素。类胡萝卜素的生物合成仅发生在细菌，真菌和植物中，它们具有确定的功能，包括在光合作用的光收集蛋白中作为天线的作用，在光合作用中调节光能转化的能力以及保护植物的能力。来自活性氧种类和颜色。在人类中，一些类胡萝卜素（维生素原A类胡萝卜素：α-胡萝卜素，β-胡萝卜素，γ-胡萝卜素和叶黄素β-隐黄质）因其向维生素A的转化而闻名。到目前为止，β-胡萝卜素似乎在开发食品加工策略以防止LOX介导的变质（如氧化，酸败和异味）中吸引了更多关注。为了在体内开展关于LOX抑制的体外机制研究，需要进行更多的研究。其他类胡萝卜素，如叶黄素，玉米黄质，纯形式以及天然提取物中的β-隐黄质，由于其抗氧化作用，可能是抑制LOX的良好候选物。

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