4377
Cellulase and xylanase under five different combinations ( cellulase / xylanase : 50 / 0 , 50 / 25 , 50 / 50 , 25 / 50 , and 0 / 50 U / g lime peel ) at ambient pressure , 100 and 200 MPa were used to extract pectin from dried lime peel .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None