








摘 要:采用2 g/100 mL的氯化亞鐵溶液處理羅非魚片,定期取樣測定魚片的感官評分、菌落總數(shù)、揮發(fā)性鹽基氮(total volatile basic nitrogen,TVB-N)和三甲胺(trimethylamine,TMA)含量,結(jié)合聚合酶鏈?zhǔn)椒磻?yīng)-變性梯度凝膠電泳(polymerase chain reaction-denaturing gradient gel electrophoresis,PCR-DGGE)分析亞鐵離子對魚片上細(xì)菌生長的影響。結(jié)果表明,氯化亞鐵處理魚片的感官較好,菌落總數(shù)、TVB-N和TMA含量較對照魚片明顯降低,對照魚片和氯化鈉處理魚片在4 ℃冷藏9 d,菌落總數(shù)、TVB-N和TMA含量超過國家標(biāo)準(zhǔn)規(guī)定限量,而氯化亞鐵處理魚片的菌落總數(shù)、TVB-N和TMA含量未超標(biāo)。通過PCR-DGGE分析可知,氯化亞鐵處理魚片在冷藏初期的菌相復(fù)雜,冷藏6 d后,腐敗希瓦氏菌(Shewanella putrefaciens)、嗜冷桿菌(Psychrobacter)數(shù)量增多,假單胞菌(Pseudomonas)數(shù)量減少,但Pseudomonas在整個菌相中依舊數(shù)量最多,仍是優(yōu)勢菌。
關(guān)鍵詞:魚片;亞鐵離子;細(xì)菌;變性梯度凝膠電泳
Influence of Ferrous Ions on Bacterial Growth on Tilapia Fillets
MENG Xiaohua
(Hebi Polytechnic, Hebi 458030, China)
Abstract: After being treated with 2 g/100 mL ferrous chloride solution, tilapia fillets were sampled at regular intervals during storage for measurement of sensory score, total bacterial count, total volatile basic nitrogen (TVB-N) content, and trimethylamine (TMA) content. Using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE), the effect of ferrous ions on bacterial growth on tilapia fillets was studied. Fillets treated with ferrous chloride solution had better sensory quality and significantly lower total bacterial count, TVB-N and TMA content compared to control fillets treated with distilled water. After storage at 4 ℃ for 9 days, the total bacterial count, TVB-N and TMA content of control samples and those treated with sodium chloride all exceeded the national limits, while those of ferrous chloride treated fillets did not. PCR-DGGE analysis showed that the bacterial flora of ferrous chloride treated fillets was complicated in the early stage of cold storage. After 6 days, the number of Shewanella putrefaciens and Psychrobacter increased, while the number of Pseudomonas decreased, but was still the largest in the whole microflora; it remained the dominant bacterium.
Keywords: fish fillet; ferrous ion; bacteria; denaturing gradient gel electrophoresis
DOI:10.7506/rlyj1001-8123-20231007-093
中圖分類號:TS254.4 " " " " " " " " " " " " " " " " " " " "文獻標(biāo)志碼:A 文章編號:1001-8123(2023)10-0016-06
引文格式:
孟曉華. 亞鐵離子對羅非魚片細(xì)菌生長的影響[J]. 肉類研究, 2023, 37(10): 16-21. DOI:10.7506/rlyj1001-8123-20231007-093. " "http://www.rlyj.net.cn
MENG Xiaohua. Influence of ferrous ions on bacterial growth on tilapia fillets[J]. Meat Research, 2023, 37(10): 16-21.
(in Chinese with English abstract) DOI:10.7506/rlyj1001-8123-20231007-093. " http://www.rlyj.net.cn
羅非魚片含水量高,容易受到微生物污染,失去食用價值和經(jīng)濟價值。假單胞菌(Pseudomonas)是一類好氧或兼性厭氧的革蘭氏陰性細(xì)菌,廣泛分布在土壤[1]、
水[2]及水產(chǎn)品[3-4]中,是羅非魚片的特定腐敗菌[5],抑制Pseudomonas等微生物的生長是魚片保鮮的目標(biāo)和方向。目前關(guān)于魚片保鮮的物理和化學(xué)方法有很多,真空
保鮮[6]、氣調(diào)保鮮[7]、輻照保鮮[8]和防腐劑保鮮[9],往往出現(xiàn)不易被接受、口感差、保鮮效果不佳、成本高[10]等問題,難以滿足實際需要。近年來,金屬離子的抑菌作用研究及其在食品保鮮中的應(yīng)用逐漸興起。李瑜珍等[11]研究不同濃度葡萄糖、氯化鈉及氯化鐵對銅綠假單胞菌生物膜形成的影響。……