NORTHERN TECHNOLOGIES INTERNATIONAL CORP - FORM 10-K - EX-23.1 - EXHIBIT 23.1 - November 18, 2011

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10-K - FORM 10-K - NORTHERN TECHNOLOGIES INTERNATIONAL CORPf10k_111811.htm
EX-31.1 - EXHIBIT 31.1 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_311.htm
EX-31.2 - EXHIBIT 31.2 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_312.htm
EX-32.2 - EXHIBIT 32.2 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_322.htm
EX-21.1 - EXHIBIT 21.1 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_211.htm
EX-32.1 - EXHIBIT 32.1 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_321.htm
EX-10.16 - EXHIBIT 10.16 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_1016.htm
EX-10.13 - EXHIBIT 10.13 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_1013.htm
EX-10.12 - EXHIBIT 10.12 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_1012.htm
EX-10.14 - EXHIBIT 10.14 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_1014.htm
EX-10.15 - EXHIBIT 10.15 - NORTHERN TECHNOLOGIES INTERNATIONAL CORPexh_1015.htm
Exhibit 23.1

 
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
 


We consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 333-140244, 333-140245 and 333-171828) and Registration Statement on Form S-3 (File No. 333-153891) of Northern Technologies International Corporation and Subsidiaries of our report dated November 14, 2011, which appears on page 54 of this annual report on Form 10-K for the fiscal year ended August 31, 2011.
 
/s/ Baker Tilly Virchow Krause, LLP
 
Minneapolis, Minnesota
November 18, 2011
 

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