A simple method to measure lipase activity in wheat and wheat bran as an estimation of storage quality

Devin J. Rose, Oscar A. Pike

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The purpose of this research was to develop a simple method for measuring lipase activity as an indicator of wheat and wheat bran storage quality. This simplified method does not require the separation or purification of lipase. Optimal conditions for lipase activity measurements were determined by varying the substrate (olive oil) and water concentrations, temperature, and incubation time. Following incubation, FFA were quantified spectrophotometrically using a copper soap assay, and lipase activity was expressed as units/gram (U/g), where 1 U was defined as the microequivalents of oleic acid liberated per hour. The method was tested on one commercial and four pure wheat cultivars. The lipase activity was also correlated with the development of FFA during actual storage of heat-treated commercial bran. Lipase activity in wheat bran ranged from 2.17 to 9.42 U/g, and in whole kernel wheat from 1.05 to 3.54 U/g. Optimal olive oil and water concentrations were 0.4 to 0.8 ml and 0.15 to 0.20 mL per g of defatted sample, respectively. Optimal incubation temperature was 40°C, and incubation times of up to 8 h were linear. Lipase activity was highly correlated with the buildup of FFA in stored wheat bran (R 2 = 0.97).

Original languageEnglish (US)
Pages (from-to)415-419
Number of pages5
JournalJAOCS, Journal of the American Oil Chemists' Society
Volume83
Issue number5
DOIs
StatePublished - May 1 2006

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Lipases
Dietary Fiber
wheat bran
storage quality
Lipase
Triticum
olive oil
wheat
soaps
stored grain
Olive oil
bran
oleic acid
temperature
water
copper
methodology
heat
Soaps
cultivars

Keywords

  • Lipase
  • Lipolysis
  • Wheat
  • Wheat bran
  • Wheat germ

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry

Cite this

A simple method to measure lipase activity in wheat and wheat bran as an estimation of storage quality. / Rose, Devin J.; Pike, Oscar A.

In: JAOCS, Journal of the American Oil Chemists' Society, Vol. 83, No. 5, 01.05.2006, p. 415-419.

Research output: Contribution to journalArticle

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