嗜热链球菌在食品加工中应用广泛,挖掘能有效促进菌体增殖和维持活性稳定的物质具有重要意义。通过菌株活菌数与淮山全粉中活性成分质量分数的相关性比较和偏相关分析,研究不同来源淮山全粉及其主要活性物质对嗜热链球菌的促生长作用。结果显示,不同来源淮山全粉对嗜热链球菌增殖的影响存在差异,其中HS-4全粉的促生长效果最显著,嗜热链球菌活菌数可达到(9.42±0.04)lg CFU/mL。此外,多糖质量分数与菌株活菌数之间存在明显的正向相关性(P<0.05),而其余活性成分与菌株活菌数的正相关关系不显著或呈现出负相关关系。进一步研究发现,不同来源淮山粗多糖均能明显促进嗜热链球菌增殖,其中HS-4粗多糖的促生长效果最好;当HS-4粗多糖添加量为0.1%~0.2%(质量分数)时,对应的活菌数能达到9.00 lg CFU/mL以上;HS-4粗多糖分离纯化得到的4种组分的促生长效果也表现出明显差异,菌株活菌数整体上较对照(CK)组提高了6.03%~11.48%。研究结果说明多糖是淮山全粉中能有效促进嗜热链球菌增殖的主要活性因子。
The diet containing yeast expressing recombinant Chinook salmon growth hormone (rcsGH) was fed to juvenile Chinese prawn (Penaeus chinensis) for 50 days in the experiment. The results first indicated that the addition...
详细信息
The diet containing yeast expressing recombinant Chinook salmon growth hormone (rcsGH) was fed to juvenile Chinese prawn (Penaeus chinensis) for 50 days in the experiment. The results first indicated that the additions of both 10 ng and 100 ng rcsGH/g diet significantly promoted the growth of juvenile prawn (weight gains significantly increased compared to controls and the effect was dose dependent). In addition, the prawn fed the diet containing rcsGH exhibited the improved survival rate (with 2 fold survival rate that of controls). The experiments provided the basis of application of recombinant fish growth hormone on growth and survival enhancements of cultured Chinese prawn.
暂无评论