MONITORING THE ADULTERATION OF VIRGIN COCONUT OIL BY SELECTED VEGETABLE OILS USING DIFFERENTIAL SCANNING CALORIMETRY

Journal of Food Lipids Pub Date : 2009-02-19 DOI:10.1111/j.1745-4522.2009.01131.x

A.M. MARINA, Y.B. CHE MAN, S.A.H. NAZIMAH, I. AMIN

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引用次数: 53

Abstract

ABSTRACT

The crystallization and melting enthalpy of virgin coconut oil adulterated with palm kernel oil (PKO) and soybean oil (SBO) were studied by using differential scanning calorimetry. Virgin coconut oil was spiked separately with PKO and SBO from 2% to 40% (w/w) of adulterant oils. Fatty acids of all oils were determined to complement the differential scanning calorimetry data. The heating curve of SBO-adulterated samples showed the adulteration peak appearing at the lower temperature region at 10% adulteration level. Regression analyses using stepwise multiple linear regression were used to predict the percentage adulterant with R² of 0.9490. PKO-adulterated oils did not show any adulteration peak but demonstrated a gradual decrease in the peak height of the major exothermic peak.

PRACTICAL APPLICATIONS

An alternative method for detection of adulteration based on differential scanning calorimetry in virgin coconut oil is presented. Application of differential scanning calorimetry is rapid, does not require sample preparation and does not involve use of solvents or toxic chemicals.

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用差示扫描量热法对选定的植物油进行初榨椰子油掺假监测

摘要采用差示扫描量热法研究了棕榈仁油(PKO)和大豆油(SBO)掺假初榨椰子油的结晶焓和熔融焓。在初榨椰子油中分别加入2% ~ 40% (w/w)掺假油的PKO和SBO。测定了所有油的脂肪酸，以补充差示扫描量热法数据。掺假样品的加热曲线显示掺假峰出现在掺假量为10%时的低温区。采用逐步多元线性回归分析预测掺假率，R2为0.9490。pko掺假油没有掺假峰，但主要放热峰的峰高逐渐降低。提出了一种基于差示扫描量热法检测初榨椰子油掺假的替代方法。差示扫描量热法的应用是快速的，不需要样品制备，不涉及使用溶剂或有毒化学品。

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Journal of Food Lipids 工程技术-食品科技

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