Nutritional Value, Bioactive Compounds, and Antioxidant Activity of Phak-liang (Gnetum gnemon Linn. var. tenerum Markgr.) in Surat Thani Province, Thailand

Suan Sunandha Science and Technology Journal Pub Date : 2024-07-23 DOI:10.53848/ssstj.v11i2.816

Marisa Intawongse, Araya Pranprawit

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Abstract

The nutritional value, bioactive compounds, and antioxidant activity of Phak-liang (Gnetum gnemon Linn. var. tenerum Markgr.) were investigated. The indigenous vegetables were collected from three districts; Muang, Bannasarn, and Khirirat Nikom in Surat Thani Province. The nutritional value of the samples was carried out according to the methods of AOAC. The moisture contents ranged from 84.72-87.52%, and the ash contents ranged from 0.78-1.07% fresh weight. The percentage of fiber, protein, fat, and carbohydrate in the leafy vegetables were in the range of 3.06-3.81, 3.44-4.68, 0.65-1.08 and 7.49-9.55 fresh weight, respectively. The samples were analyzed by ICP-OES for their mineral determinations. The amounts found in the samples, in descending order were: K > Ca > Mg > Mn > Na> Fe > Zn > Cu. Considering the amounts of minerals found in the vegetable and their recommended daily values by the Bureau of Nutrition (Ministry of Public Health, Thailand), the daily value (DV) percentage of Mn in the samples were relatively high (28.45-96.65%), whereas K, Mg, Ca, Fe, Cu and Zn contributed from 1.29–8.42% of the daily values. The vegetable had negligible amounts of Na (0.03 - 0.07% of the DV). The antioxidant capacities were analyzed using Ferric Reducing Antioxidant Power (FRAP) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The results showed that antioxidant activity increased by the concentration of the ethanol extracts. The FRAP values of the extracts ranged from 89.01-160.70 µM FeSO4/100 g dry weight, and the IC50 values calculated for DPPH radical scavenging activities of the extracts ranged from 54.37-60.57 mg/mL. The results suggested that Phak-liang is a potential source of natural phytochemicals and could be used for health promotion in the community.

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泰国素叻他尼府帕克亮（Gnetum gnemon Linn.

研究人员对帕克良（Gnetum gnemon Linn. var.这些本土蔬菜采集自素叻他尼府的三个地区：Muang、Bannasarn 和 Khirirat Nikom。根据 AOAC 方法对样品进行了营养价值测定。水分含量为 84.72%-87.52%，灰分含量为 0.78%-1.07%。叶菜中纤维、蛋白质、脂肪和碳水化合物的含量分别为鲜重 3.06-3.81、3.44-4.68、0.65-1.08 和 7.49-9.55。这些样品采用 ICP-OES 进行了矿物质测定分析。样品中的矿物质含量从高到低依次为K > Ca > Mg > Mn > Na > Fe > Zn > Cu。考虑到蔬菜中发现的矿物质含量和营养局（泰国公共卫生部）推荐的日摄入量，样品中锰的日摄入量相对较高（28.45%-96.65%），而钾、镁、钙、铁、铜和锌的日摄入量为 1.29%-8.42%。蔬菜中的 Na 含量微乎其微（占 DV 的 0.03 - 0.07%）。使用铁还原抗氧化能力（FRAP）和 2,2-二苯基-1-苦基肼（DPPH）检测法分析了抗氧化能力。结果表明，乙醇提取物的浓度越高，抗氧化活性越强。提取物的 FRAP 值范围为 89.01-160.70 µM FeSO4/100 g 干重，提取物 DPPH 自由基清除活性的 IC50 值范围为 54.37-60.57 mg/mL。结果表明，法桐是一种潜在的天然植物化学物质来源，可用于促进社区健康。

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Suan Sunandha Science and Technology Journal

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