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Antimicrobial efficacy of phytochemicals against Bacillus cereus in reconstituted infant rice cereal

机译：植物化学物质对再生婴儿米粉中蜡状芽孢杆菌的抗菌作用

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The objective of this study was to determine the potential use of Trans-cinnamaldehyde (TC), (−)-Epigallocatechin gallate (EGCG) and [10]-Gingerol (GI) to inhibit the growth of B. cereus in infant rice cereal reconstituted with infant formula. Samples were inoculated with either vegetative cells or spores of B. cereus (ATCC 14579), and they were treated with 500 ppm (mg/L) TC, EGCG and GI. They were stored at 7 °C, 23 °C, or 37 °C for 0, 4, 8 and 24 h to simulate advance preparation, handling and temperature abuse. At 23 °C no growth was observed with TC over 24 h. TC also showed the highest antimicrobial activity 37 °C by inhibiting the growth of B. cereus vegetative cells by 0.83 log CFU/g and B. cereus spores by 2.0 log CFU/g after 24 h. B. cereus (ATCC 14579) did not grow at 7 °C over 24 h and TC had no effect on its survival. Significant differences (P < 0.05) were found in color and aroma of rice cereal samples containing EGCG and TC, respectively. Additionally, TC exhibited a cinnamon taste, while EGCG gave a purple color to the reconstituted rice cereal. These results indicate that TC may serve as a potential natural antimicrobial in reconstituted infant rice cereal even when utilized at low concentrations, inhibiting both vegetative cells and spores of B. cereus.
机译：这项研究的目的是确定潜在的利用反式肉桂醛（TC），（-）-表没食子儿茶素没食子酸酯（EGCG）和[10]-姜油（GI）抑制重构的婴儿米粉中蜡状芽孢杆菌的生长。与婴儿配方奶粉。用蜡状芽孢杆菌的营养细胞或孢子（ATCC 14579）接种样品，并用500 ppm（mg / L）TC，EGCG和GI处理。它们分别在7°C，23°C或37°C下存储0、4、8和24小时，以模拟预先准备，处理和温度滥用。在23°C下，TC在24小时内未观察到生长。 24小时后，TC通过抑制蜡状芽孢杆菌营养细胞的生长0.83 log CFU / g和蜡状芽孢杆菌孢子的2.0 log CFU / g表现出最高的抗菌活性（37°C）。蜡状芽孢杆菌（ATCC 14579）在7°C的温度下未在24小时内生长，TC对它的存活没有影响。分别含有EGCG和TC的米谷物样品的颜色和香气上存在显着差异（P <0.05）。此外，TC表现出肉桂味，而EGCG使重构后的米糊呈紫色。这些结果表明，即使在低浓度使用时，TC仍可以在重构的婴儿米粉中用作潜在的天然抗菌剂，从而抑制蜡状芽孢杆菌的营养细胞和孢子。

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