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鮮切水果磁電方法益生菌增效研究
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“十二五”國家科技支撐計劃項目(2012BAD37B00)


Enrichment of Probiotics in Fresh-cut Fruits Using Magnetic-electric Process Method
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    摘要:

    為實現(xiàn)鮮切水果的益生菌富集,將感應(yīng)交變電場施加于浸漬溶液體系,,同時在旋轉(zhuǎn)磁場的影響下有效促進溶液中鼠李糖乳桿菌向鮮切蘋果和草莓滲透,,考察了浸漬時體系場強,、電場頻率,、磁場強度和頻率,、環(huán)境pH值和溫度對樣品中鼠李糖乳桿菌數(shù)的影響,,發(fā)現(xiàn)體系場強和磁場強度越高則越有利于菌體在樣品中的擴散和滲透,,體系場強3 V/cm,,磁場強度0.13 T時可獲最高的菌數(shù)含量,,即鮮切蘋果和草莓菌體濃度可達9.23×10 8 個/g和1.22× 10 8 個/g, 較低的pH值環(huán)境同樣有利于菌體在樣品中的富集,,但環(huán)境pH值為6.9和8.1時,,在試樣期內(nèi)其各自樣品中最高菌體濃度分別只有4.32×10 8 個/g和5.4×10 7 個/g,即低于酸性環(huán)境下獲得的活菌數(shù),,處理鮮切蘋果時存在最適電場頻率和磁場頻率各自分別為200 Hz和1 Hz,,該研究為益生菌在鮮切果蔬中的快速富集提供了一種參考方法。

    Abstract:

    Probiotic enrichment in fresh-cut fruits was achieved in the impregnation system when induced alternating electric field was used in conjunction with rotating perpendicular magnetic field. The method was intended to promote the efficiency of Lactobacillus rhamnosus diffusion into the tissues of apples and strawberries based on the experimental transformer structure. The amount of probiotic in the sample tissues was investigated under the influence of voltage levels (1 V/cm, 2 V/cm, 3 V/cm), voltage frequencies (50 Hz, 200 Hz, 400 Hz), magnetic field intensities (260 Gs, 900 Gs, 1 300 Gs), rotating magnetic frequencies (0.1 Hz, 1 Hz, 10 Hz), temperature (20℃, 40℃, 60℃, 80℃) and the pH values (3.2, 3.5, 4.6, 5.5, 6.9, 8.1, 10.7) of the impregnation solutions. It was demonstrated that high voltage levels and magnetic field intensities were conducive to the diffusion of probiotics into the sample tissues. The highest amount of probiotic in the sample tissues was achieved at system voltage of 3 V/cm and magnetic field intensity of 1 300 Gs. The maximum amounts of probiotic in fresh-cut apples and strawberries were increased to 9.23×10 8 CFU/g and 1.22×10 8 CFU/g, respectively. Impregnation solutions with low pH values were conducive for the accumulation of probiotics in the samples. The highest amounts of Lactobacillus rhamnosus were 4.32×10 8 CFU/g and 5.4×10 7 CFU/g in the fresh-cut apples and strawberries, respectively, during processing at pH values of 6.9 and 8.1 which showed lower living bacterium content in fresh-cut fruits compared with the samples in the acidic impregnation solution. The optimal electric field frequency and magnetic field frequency for impregnation treatment of fresh-cut apples through this magnetic-electric method were at 200 Hz and 1 Hz, respectively. The proposed impregnation method can provide a reference for probiotic enrichment of fresh-cut fruits.

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楊哪,金亞美,徐悅,徐學(xué)明,金征宇.鮮切水果磁電方法益生菌增效研究[J].農(nóng)業(yè)機械學(xué)報,2016,47(2):258-263,322. Yang Na, Jin Yamei, Xu Yue, Xu Xueming, Jin Zhengyu. Enrichment of Probiotics in Fresh-cut Fruits Using Magnetic-electric Process Method[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):258-263,322.

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  • 收稿日期:2015-07-07
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  • 在線發(fā)布日期: 2016-02-25
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