I need to measure the total cholesterol from serum and liver tissue samples. We don't have enough funds to procure kits. While searching by literature, i observed several colorimetric assays to measure total cholesterol, i.e. 

1. Direct manual determination of serum total cholesterol with a single stable     reagent. Wybenga DR, Pileggi VJ, Dirstine PH, Di Giorgio J.

2. Colorimetry of serum cholesterol with use of ferric acetate/uranyl acetate and ferrous sulfate/sulfuric acid reagents.Jung DH, Biggs HG, Moorehead WR.

Please suggest me about the best colorimetric assay to measure total cholesterol. Thanking you in advance for sharing your knowledge.

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