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Apr 30, 2021Keywords:
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Main Article Content
Effects of different packaging materials on the chemical and sensory properties of moi-moi
Abstract
The preparation of moi-moi usually involves wrapping of cowpea slurry with packaging materials such as broad leaves, aluminium foils, aluminium cans, nylon, plastic plate or stainless steel plate before cooking to form a gel. There are concerns that these packaging materials are pathways for the migration of hazardous substances into the food. The packaging materials and ingredients for moi-moi preparation were obtained from Ndoro Oboro periodic market, Ikwuano Local Government Area, Abia State, Nigeria. The moi-moi mix was prepared using standard method and wrapped in the packaging materials listed before cooking. The proximate composition, heavy metals and volatile components of moi-moi samples were characterized using standard methods. The moisture, crude protein, fat and ash content of the samples were significantly affected by packaging material. The nickel content of the moi-moi samples ranged from 0.017 (in moi-moi cooked with plastic plate) to 0.335 mg/l (in moi-moi cooked with Aluminium foil). The cadmium content ranged from 0.031mg/l (in moi-moi cooked with leaves) to 0.092mg/l (in moi-moi cooked in aluminium foil). The aluminium content of the samples packaged in aluminium can and aluminium foil was significantly higher than that of the other samples. The lead content ranged from 0.009mg/l (in moi-moi packaged in stainless steel) to 0.036mg/l (in moi-moi packaged in plastic plate, aluminium can and nylon). A total of seventy seven (77) volatile compounds were identified in the moi-moi samples, some of which were suspected to have migrated from the packaging materials. Among which were Morphinan-4, 5-epoxy-3, 6-di-ol, 6,-[7-nitronenzofuran-4-yl] amino which was identified in moi-moi cooked in leaves and is a by-product of polychlorinated dibenzo-furans (PCDFs) used as pesticide. The compound;10-Acetoxy-2-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,7,8,8a,9,10,11,12,12a,12b,13,14b octadecahydro present in the moi-moi packaged in nylon is likely to be a product of triacetin used for manufacturing food contact plastics. The results from this study indicate that packaging materials have significant effects on the proximate, heavy metals, sensory and volatile compounds composition of moi-moi produced from the same bean slurry.
