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[求助] 关于FISH的杂交缓冲液的配方

我看一篇论文用eub和一种检测大肠杆菌的探针同时杂交，杂交缓冲液里含有牛血清蛋白和多聚腺苷酸，这是做什么用的呢？
文章题目是：Enumeration of viable E. coli in rivers and wastewaters by fluorescent in situ hybridization
作者:Tamara Garcia-Armisen
是这么写的：For hybridization, filters issued from the DVC stage were transferred onto a new pad soaked with 300 μl of hybridization buffer consisting of 0.9 M NaCl, 20 mM Tris–HCl (pH 7.2), 0.1% (w/v) sodium dodecyl sulfate (SDS), 0.2% (w/v) bovine serum albumin (BSA, fraction V Sigma), 0.1 mg/ml polyadenylic acid (ICN) and 22% deionized formamide (ACROS).
请各位大侠指教！

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