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ncq288: 金币+50, 翻译EPI+1, ★有帮助 2013-09-29 19:05:59
供参考：
Bacteriostasis and preservation of cherry tomatoes with crude extracts of Catalpa ovata root bark
Abstract: in this study, 95% ethanol was used as an extraction solvent for root bark of Catalpa ovata, and the crude extract was obtained through concentration by rotary evaporator. This extract was used in bacteriostatic experiment against common putrefying bacteria in food. To explore its role in preservation of cherry tomato, it was formulated into 0.3% preservation solution for comparison with 0.3% sodium benzoate preservative and water as control. The results showed that the crude extract exhibited better inhibition effect on common bacteria and fungi, among which, the inhibition effect on Staphylococcus aureus was the strongest with an inhibition diameter of 35.00 mm, while the inhibition diameter against Bacillus subtilis, Escherichia coli, Saccharomyces, and Penicillium bacteria were 31.00mm, 27.00mm, 24.00mm, and 21.00mm, respectively. The 0.3% crude extract solution promoted preservation of cherry tomatoes. Both the crude extract solution and sodium benzoate solution exhibited better preservation than the water control. In terms of rotting rate and contents of vitamin C, the sodium benzoate treatment is better than the crude extract treatment, whereas in terms of mass loss rate, soluble solids content and content of titratable acid, the crude extract treatment performed better than the sodium benzoate treatment.
Keywords: root bark of Catalpa ovata, crude extract, cherry tomatoes, preservation
Table 1 bacterial inhibition diameter (mm) by 2g/mL crude extract of Catalpa ovata root bark
Figure 1 Mass loss rate with different preservation approaches for cherry tomatoes
Figure 2 Rotting rate with different preservation approaches for cherry tomatoes
Figure 3 Soluble solid contents with different preservation approaches for cherry tomatoes
Figure 4 Titratable acidity changes with different preservation approaches for cherry tomatoes
Figure 5 Vitamin C contents with different preservation approaches for cherry tomatoes |
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