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Bioresources and Bioprocessing

Table 3 The main peak of the FTIR spectrum of WO-RP and their assignments

From: Response surface optimization of biodiesel yield from pre-treated waste oil of rendered pork from a food processing industry

Assignment

Wavelength peak, cm−1

Range

Actual

C–H stretch (alkane)

2850–3000

2990, 2909

C=H stretch (carbonyl)

1670–1820

1689

C=C–C stretch (aryl)

1400–1600

1498

C–O stretch (ether)

1000–1300

1089, 1039

C–H send (alkyne)

610–680

631, 662

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