Grapefruits, tangerines and several orange cultivars were evaluated for total and thermostable pectinesterase (TS-PE) activity. Juices were extracted with a Fresh'n Squeeze Multi Fruit Juicer. Variation in total pectinesterase (PE) and TS-PE was not significantly different between cultivars. No significant contribution by traditional quality control parameters (%pulp, ЊBrix, % acid, pH), to total PE or TS-PE was observed. Positive correlations were observed between TS-PE and total PE, when expressed on a pulp (0.669) or soluble solids (0.624) basis.
Protein was extracted and isolated from canola oil processing waste.
Canola is an increasingly
important oilseed crop worldwide. More than 99% of protein was
extracted from crude commercial
hexane defatted canola meal when a 5% w/v suspension in 0.4% w/v NaOH
was agitated for 60 min
at room temperature in baffled flasks on an orbital shaker at 180−200
rpm. Protein recovery was
87.5% upon precipitation with acetic acid. The major proteins in
canola seed were glutelins (91.8%
soluble in 0.4% w/v NaOH) and globulins (50.9% soluble in 5% w/v
NaCl) as measured by separate
extractions. Canola proteins had poor solubility between pH 2 and
10 for all dispersion solutions.
Solubility of protein isolates was 60% or less. Extraction
and precipitation procedure did not produce
lysinoalanine. Amino acid profile of isolates indicated high
nutritional quality for use in products
for 10−12-year-olds and adults.
Keywords: Canola meal; canola meal protein; protein quality
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