(Source: scmp.com | Photo: Dickson Lee)

Polytechnic University scientists have developed a method that can rapidly distinguish between so-called “gutter oils” at the centre of a series of food safety scandals and safe edible oils.

Traditionally, testing can take hours and is labour-intensive, but the PolyU team has adopted a technique that uses lasers to ionize samples. They then analyse the oil spectra – broadly speaking, a comparison of the oil components and the intensity with which they are found.

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