To deduct employee business expenses, your employer needs to have a policy which states that you are responsible for such purchases. Most likely, your purchases do not fit this test. More importantly, your expenditures are unlikely to be high enough to make a difference. The Employee Business Expenses deduction is geared towards sales people, people in "blue collar" trades, and others who have significant out of pockets that their employers explicitly do not pay for.
You must itemize, and your employee expenses must be greater than 2% of your Adjust Gross Income before you see a penny back.
Ex: AGI $40,000. 2%= 800. Employee Expenses of $910. Deduction $110.
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