Role of calcium lactate
For maintaining the texture and achieve high quality of frozen strawberry, calcium lactate was added to fresh strawberry either alone or combined with precooling. The influence of Ca lactate treatments on some properties of frozen strawberry was presented in Table 2. The obtained results indicated that calcium lactate played an effective role in reducing the drip loss and improving the firmness of thawed berries. Complementing calcium treatments with precooling was more effective than other treatments. Same trends were obtained by Carle et al. (2001), they found that a combination of calcium brining and cold storage markedly improved the firmness of strawberry due to the presence of pectinmethylesterase and peroxidase activity even at low temperature and pH 4. The results declared that slight changes in both titratable acidity and pH values were found in calcium treatments either frozen directly or frozen after cooling.