Why does AllPrep DNA/RNA/Protein Mini kit use buffer RLT, but Allprep DNA/RNA Mini and Allprep DNA/RNA Micro kits use buffer RLT Plus? Are these buffers interchangeable?
FAQ ID - 3391

Buffer RLT Plus contains detergents that are more ideal for binding of DNA to the AllPrep DNA mini spin columns.

But RLT Plus is not compatible with Buffer APP used to precipitate proteins in AllPrep DNA/RNA/Protein Mini kit. Therefore, we chose RLT instead of RLT Plus to get both DNA and proteins with this kit.

RLT lysates can also be used in AllPrep RNA/DNA kit or the AllPrep DNA/RNA Micro kit. DNA and RNA yields should be fine, but RNA may contain slightly higher levels of genomic DNA contamination.