Nutrients composition and functional properties of oil palm syrup, aqueous extract of kola nut and their mixtures

European Journal of Agriculture and Food Sciences Pub Date : 2023-08-12 DOI:10.4314/jafs.v21i1.1

V. T. Komolafe, F. Oboh

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Abstract

In this study, oil palm (Elaeis guineensis) syrup, aqueous extracts of kola nut (Cola acuminata) and their mixtures (decoction of C. acuminata in 20 % oil palm syrup solution) were investigated using suitable biochemical procedures. The proximate analysis of oil palm syrup and C. acuminata revealed the values of moisture, crude protein, fat, ash, fibre and nitrogen free extract of oil palm syrup were 29.55 %, 0.50 %, 2.34 %, 2.32 %, 0.00 % and 65.29 % while values for the C. acuminata were 44.70 %, 17.50 %, 2.45 %, 1.91 %, 8.86 % and 24.58 %. Also, the total carbohydrate constituted 66.29 % when determined by anthrone method. The pH and titratable acidity values were within the acidic range. The syrup, C. acuminata and its mixture extracts recorded high reducing power, total phenolic and vitamin C contents. The IC50 values of α-amylase inhibitory activity for aqueous solutions of palm syrup, aqueous extracts of C. acuminata and its mixture extract were 0.51, 4.50 and 12.10 % respectively. The 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of aqueous solutions of oil palm syrup, aqueous extracts of C. acuminata and its mixture extracts revealed IC50 values of 8.44, 3.29 and 6.60 %. The results of this study suggest that the decoction of C. acuminata in 20 % syrup solution had synergistic effects with respect to in vitro antioxidant properties and alpha amylase inhibitory potential, and further indicates that the studied extracts could elicit potential nutritional and health benefits.

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油棕糖浆、可乐果水提物及其混合物的营养成分和功能特性

本研究采用合适的生化方法，对油棕糖浆、可乐果水提物及其混合物(可乐果在20%油棕糖浆溶液中煎煮)进行了研究。油棕糖浆和荆芥的水分、粗蛋白质、脂肪、灰分、纤维和无氮提取物含量分别为29.55%、0.50%、2.34%、2.32%、0.00 %和65.29%，荆芥的水分、粗蛋白质、粗脂肪、灰分、纤维和无氮提取物含量分别为44.70%、17.50%、2.45%、1.91%、8.86%和24.58%。蒽酮法测定总碳水化合物含量为66.29%。pH值和可滴定酸度值均在酸性范围内。糖浆、荆芥及其混合提取物具有较高的还原力、总酚和维生素C含量。棕榈糖浆水溶液、金针叶提取物及其混合提取物对α-淀粉酶抑制活性的IC50值分别为0.51、4.50和12.10%。油棕糖浆水溶液、油棕水提液及其混合提取物的DPPH自由基清除活性IC50值分别为8.44、3.29和6.60%。本研究结果表明，20%糖浆水煎液在体外抗氧化性能和α淀粉酶抑制潜力方面具有协同作用，进一步表明所研究的提取物可能具有潜在的营养和健康益处。

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European Journal of Agriculture and Food Sciences

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