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Bacteriostatic experiment of Catalpa ovata root bark extracts and the study on preservation of cherry tomatoes with the extracts
Abstract: in this study, 95% ethanol is used as extraction solvent for the extracts of root bark of Catalpa ovata, concentrated by rotary evaporator to obtain the crude extracts. The common antibacterial experiments is dealed with the crude extracts putrefying bacteria in food and the root bark of Catalpa ovata extract should be prepared to 0.3% antistaling agent  ,which is compared with 0.3% sodium benzoate preservative as well as water as blank control group to explore their role of preservation on cherry tomato. The results showed that the root bark of Catalpa extracts have better inhibition effect on common bacteria and fungi, among which, the Inhibition effect of the extract on Staphylococcus aureus is the strongest, the diameter of inhibition reached to 35.00 mm, the diameter of inhibition against Bacillus subtilis, Escherichia coli, Saccharomyces, Penicillium bacteria were respectively 31.00mm, 27.00mm, 24.00mm, 21.00mm. the 0.3% crude extracts have positive effects on the preservation of cherry tomatoes. Both preservative effect of Catalpa root bark extracts treatment group and it of sodium benzoate treatment group were better than the control group.When the rotting rate and the contents of vitamin C are regarded as standard, the effect of sodium benzoate treatment group is better than it of root bark of Catalpa ovata treatment group. If the mass loss rate, soluble solids content and the content of titratable acid are regarded as standard. The root bark of Catalpa ovata extracts treatment group was better than sodium benzoate treatment group.
Keywords: root bark of Catalpa ovata, crude extracts, cherry tomatoes, preservation
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ncq288: ½ð±Ò+50, ·­ÒëEPI+1, ¡ïÓаïÖú 2013-09-29 19:05:59
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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
2Â¥2013-09-29 12:16:43
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