title: Use of principal component analysis for differentiation of gelatine sources based on polypeptide molecular weights.
abstract: The study was aimed to differentiate between porcine and bovine gelatines in adulterated samples by utilising sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) combined with principal component analysis (PCA). The distinct polypeptide patterns of 6 porcine type A and 6 bovine type B gelatines at molecular weight ranged from 50 to 220 kDa were studied. Experimental samples of raw gelatine were prepared by adding porcine gelatine in a proportion ranging from 5% to 50% (v/v) to bovine gelatine and vice versa. The method used was able to detect 5% porcine gelatine added to the bovine gelatine. There were no differences in the electrophoretic profiles of the jelly samples when the proteins were extracted with an acetone precipitation method. The simple approach employing SDS-PAGE and PCA reported in this paper may provide a useful tool for food authenticity issues concerning gelatine.
authors.affiliation: Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: T
authors.initials: T
authors.lastname: Nur Azira
authors.affiliation: Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Y B
authors.initials: YB
authors.lastname: Che Man
authors.affiliation: Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: R N
authors.initials: RN
authors.lastname: Raja Mohd Hafidz
authors.affiliation: Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: M A
authors.initials: MA
authors.lastname: Aina
authors.affiliation: Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: aminis@upm.edu.my.
authors.forename: I
authors.initials: I
authors.lastname: Amin
mesh_terms: D000818:Animals; D002417:Cattle; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods*; D005506:Food Contamination; D005780:Gelatin / Q000737:chemistry*; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry*; D025341:Principal Component Analysis; D013552:Swine
chemical_list: D010455:Peptides; D005780:Gelatin
keywords: Acetone precipitation; Adulteration; Food authenticity; Gelatine polypeptides; Principal component analysis