# Efficient way to search list of items in a text document

I have a list of items (size ~50K) and several documents( average page per document ~10). I am trying to find what all items are listed in each document as follows :

for document in documents_folder:
document_text = extract_content(document)
for item in item_list:
if item is found in document_text:
save(doument,item)


This takes ~5 sec per document to execute.

How can this be optimized ? Is this the best approach ? Is there a better way to do this ?

Any suggestion is appreciated