卟啉,从紫菜中提取的主要多糖,由于其具有多种生物活性,因此具有作为功能性食品或药物的巨大发展潜力。卟啉的定量分析对于产品开发中的质量控制很重要。然而,卟啉的具体定量方法尚未建立,缺乏参考物质使得量化更具挑战性。这里,卟啉的常见成分,纯度高,相似的分子量分布,来自中国不同产地的紫菜首先经过一系列的分离和纯化步骤,并用作卟啉定量的参考物质。随后,通过使用β-卟啉酶将卟啉完全降解为寡糖,然后采用对羟基苯甲酸酰肼(pHBH)法检测生成的还原糖的含量。建立了卟啉特异性定量的酶-pHBH方法。结果表明,该方法线性良好,高准确度和精密度,和可靠性。此外,NaCl浓度低于0.5%,8%以下的酒精和壳聚糖和岩藻聚糖等多糖不会干扰这种方法。这种方法对于卟啉产品的质量控制很有希望,并为其他多糖的特异性定量提供了可行的策略。
Porphyran, the major polysaccharide extracted from Porphyra, exhibits tremendous potential for development as functional food or pharmaceutical due to its multiple biological activities. The quantitative analysis of
porphyran is important for the quality control in product development. However, the specific quantitative method of
porphyran has not been established, and the lack of reference substance makes the quantification more challenging. Here, a common component of
porphyran, with high purity, similar molecular weight distribution, sourced from different Porphyra producing areas in China was first prepared by a series of isolation and purification steps, and utilized as the reference substance for porphyran quantification. Subsequently, the porphyran was fully degraded into oligosaccharides by using a β-porphyranase, followed by employing para-hydroxybenzoic acid hydrazide (pHBH) method to detect the content of the generated reducing sugar. The enzyme-pHBH method for
porphyran specific quantification was established. Results showed that this method was validated with good linearity, high accuracy and precision, and reliability. Addtionally, NaCl with a concentration below 0.5 %, alcohol under 8 % and other polysaccharide including chitosan, agarose, chondrotin sulfate, alginate, hyaluronic acid and κ-carrageenan did not interfere with this method. This approach is promising for quality control of the porphyran products and offers a feasible strategy for the specific quantification of other polysaccharides.