Subject: Can lead act as a co-enzyme with lipase?

My investigation has shown results that suggest that lipase alone does not 
break down the lipid molecules in cooking oil, however, when I added lead 
nitrate solution, the pH changed, thus suggesting that fatty acids were 
produced. Does this mean that the lead functioned as a co-enzyme? However, even 
when used alone with the cooking oil, the lead nitrate seemingly hydrolysed the 
lipid, so I'm rather confused as I thought lead always acted as an 
uncompetitive inhibitor!(The pH of the lead nitrate itself was neutral).  
Thankyou! :)

Re: Can lead act as a co-enzyme with lipase?