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- Salicornia ramosissima as a salt substitute in the fermentation of white cabbagePublication . Pires-Cabral, Patricia; Pires-Cabral, Paula; Quintas, CéliaThis research aimed to study the fermentation of white cabbage (Brassica oleracea) replacing salt, totally or partially, with halophyte Salicornia ramosissima, to reduce the sodium content in the final products. Three fermentation trials of cabbage were done: A with 2.91% salt (similar to 1.15% Na) (control); B with salicornia (similar to 1.56% salt equivalent, similar to 0.34% Na); and C with salt and salicornia (similar to 1.94% salt equivalent, similar to 0.49% Na). The fermentation profile was followed by the physicochemical (pH, total acidity) and microbial parameters [mesophilic microorganisms (MM), lactic-acid bacteria (LAB), coliforms and fungi]. The content of phenolics and antioxidant activity in the fermented products were also measured. In all experiments, there was an increase, followed by a stabilization of the MM (5.5-7.2 Log CFU/g) and LAB populations (5.4-6.6 Log CFU/g) and a decrease of fungi and coliforms until they disappeared. A decrease in pH (< 4) and a rise in acidity (similar to 1.0%) were observed throughout the fermentations. The phenolics and antioxidant activity increased during fermentation, being significantly higher in C (37.3 mg/100 g and 3.63 mmol Trolox/100 g, respectively). The fermentation of cabbage with salicornia results in the final products having similar microbial quality to the control, but with a reduction of sodium and an increase in the antioxidant activity.
- The effect of calcium in the fermentation of white cabbage with salicorniaPublication . Pires-Cabral, Patrícia; Pires-Cabral, Paula; Mira, Helena; Quintas, CéliaThis study investigates the fermentation of white cabbage with salicornia and CaCl2 to assess its effect on the fermentation profiles and properties of the final products. Two sets of experiments were performed: A-cabbage with salt and salicornia, and B-cabbage with salt, salicornia, and CaCl2. The fermentative processes were studied through the microbial (lactic-acid bacteria (LAB), coliforms, and fungi), physicochemical (pH, total acidity), and mineral properties. A diminution of pH values (4.07, 3.58) and increased acidity values (0.70, 0.77 g lactic acid/100 mL) were registered at the end of the fermentation period (A and B, respectively). A stationary phase followed the exponential growth of LAB, and a slight decrease was observed (6.01, 5.51 Log CFU/g) in both experiments. A fungi decline was observed during the first week and the coliform populations disappeared after about 13 days of fermentation. Staphylococcus coagulase-positive, Escherichia coli, and Salmonella were not detected in the final products. The utilization of CaCl2 resulted in fermented cabbage with analogous microbial and sensorial characteristics to fermented cabbage without CaCl2 but with an increased hardness. However, Ca interfered with the diffusion of K, Mg, and Zn, resulting in lower levels of these elements in the final product, particularly Zn, which exhibited a reduction of 37%, reducing the nutritional value of the final products.