The Roles of Different Sugar Sources on the Quality of Nigella Enriched Tomato Ketchup

The study was concerned to evaluate the effect of table sugar, honey and zero-calorie sugar on the quality of nigella enriched tomato ketchup. Ketchup was prepared by mixing 5, 10 and 15% nigella paste with tomato pulp. The variations in taste, color and texture were analyzed based on the consumers’ acceptability and 5% nigella paste was appropriate for product development. Three different types of sugar source (table sugar/honey/zero-calorie sugar) were used to prepare nigella enriched tomato ketchup. Moisture content and total soluble solids (TSS) were significantly lower in the sample S2 (tomato ketchup prepared with honey) which was 64.00±1.75% and 18.00±1.8%, respectively. Sample S1 (tomato ketchup prepared with table sugar) contained higher moisture content (65.40±1.55%); though it's not significantly different with sample S3 (tomato ketchup prepared with zero-calorie sugar). Sample S3 contained significantly (p<0.05) higher amount of TSS (25±1.6%) than other samples. In case of color analysis, it was observed that L*, a* and b* value reduced for all samples when treated with sodium benzoate but not significantly different. Sensory analysis suggested that sample S1 was suitable for the processing of nigella enriched tomato ketchup.