skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effects of light and copper ions on volatile aldehydes of milk and milk fractions

Abstract

Raw, laboratory-pasteurized and plant-pasteurized homogenized milks were exposed to copper ions (5 ppm), to sunlight or fluorescent light and the effects determined on the composition of volatile aldehydes. The greatest change due to copper treatment was an increase in n-hexanal; acetaldehyde showed the least response in each of the sources of milk. The responses were similar from all three sources of milk with laboratory-pasteurized milk samples showing the greatest responses for each aldehyde analyzed. Similar milk samples exposed to sunlight also showed an increase in volatile aldehydes from all milk sources but with the greatest response being acetaldehyde and n-pentanal components. The milk fraction most susceptible to changes in the presence of light was neutralized whey, whereas resuspended cream was most susceptible to copper exposure. Overall, dialyzed whey appeared to be influenced more than other milk fractions by both light and copper ions.

Authors:
; ;
Publication Date:
OSTI Identifier:
5257400
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Dairy Science; (USA); Journal Volume: 71:9
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; COPPER COMPOUNDS; BIOLOGICAL EFFECTS; MILK; CHEMICAL COMPOSITION; VISIBLE RADIATION; ALDEHYDES; BIOLOGICAL MATERIALS; BODY FLUIDS; ELECTROMAGNETIC RADIATION; FOOD; MATERIALS; ORGANIC COMPOUNDS; RADIATIONS; TRANSITION ELEMENT COMPOUNDS 560300* -- Chemicals Metabolism & Toxicology

Citation Formats

Jeno, W., Bassette, R., and Crang, R.E. Effects of light and copper ions on volatile aldehydes of milk and milk fractions. United States: N. p., 1988. Web.
Jeno, W., Bassette, R., & Crang, R.E. Effects of light and copper ions on volatile aldehydes of milk and milk fractions. United States.
Jeno, W., Bassette, R., and Crang, R.E. 1988. "Effects of light and copper ions on volatile aldehydes of milk and milk fractions". United States. doi:.
@article{osti_5257400,
title = {Effects of light and copper ions on volatile aldehydes of milk and milk fractions},
author = {Jeno, W. and Bassette, R. and Crang, R.E.},
abstractNote = {Raw, laboratory-pasteurized and plant-pasteurized homogenized milks were exposed to copper ions (5 ppm), to sunlight or fluorescent light and the effects determined on the composition of volatile aldehydes. The greatest change due to copper treatment was an increase in n-hexanal; acetaldehyde showed the least response in each of the sources of milk. The responses were similar from all three sources of milk with laboratory-pasteurized milk samples showing the greatest responses for each aldehyde analyzed. Similar milk samples exposed to sunlight also showed an increase in volatile aldehydes from all milk sources but with the greatest response being acetaldehyde and n-pentanal components. The milk fraction most susceptible to changes in the presence of light was neutralized whey, whereas resuspended cream was most susceptible to copper exposure. Overall, dialyzed whey appeared to be influenced more than other milk fractions by both light and copper ions.},
doi = {},
journal = {Journal of Dairy Science; (USA)},
number = ,
volume = 71:9,
place = {United States},
year = 1988,
month = 9
}
  • The influence of particular heavy metals on the biochemical oxygen demand of milk wastes was investigated for three concentrations each of mercury, copper, and lead, plus a control. Copper caused a 70% and mercury a 75% reduction in measured biochemical oxygen demand at .64 mg/liter while lead caused a similar reduction at five times (3.20 mg/liter) this concentration. Synergistic toxicity interactions were indicated from accrued data and earlier references. It was theorized that accumulation of certain heavy metals at less than .1 mg/liter could reduce the observed biochemical oxygen demand by 20 to 30%.
  • Variation in concentrations of acid-volatile sulfide (AVS) in sediments from the upper Clark Fork River of Montana, USA, was associated with differences in bioaccumulation of Cu and Zn and growth of larvae of the midge, Chironomus tentans. Growth of midge larvae was significantly greater and bioaccumulation of Cu was significantly less in surface sections (0--3 cm depth) of sediment cores, which had greater concentrations of AVS and lesser ratios of simultaneously extracted metals to AVS (SEM:AVS ratios) than in subsurface sediments (6--9 cm). Concentrations of AVS were significantly less in sediments incubated with oxic overlying water for 9 weeks thanmore » in the same sediments incubated under anoxic conditions. Bioaccumulation of Cu differed significantly between incubation treatments, corresponding to differences in concentrations of AVS and SEM:AVS ratios, although midge growth did not. Bioaccumulation of Zn did not differ significantly between depth strata of sediment cores or between incubation treatments. When results from the two sets of bioassays were combined, bioaccumulation of Cu and Zn, but not growth, was significantly correlated with SEM:AVS ratios and other estimates of bioavailable metal fractions in sediments. Growth of midge larvae was significantly correlated with bioaccumulation of Zn, but not Cu, suggesting that Zn was the greater contributor to the toxicity of these sediments. Assessments of the toxicity of metal-contaminated freshwater sediments should consider the effects of spatial and temporal variation in AVS concentrations on metal bioavailability.« less
  • A modified version of the evaporative ensemble model is employed to deduce relative binding energies for protonated cluster ions using previously measured metastable dissociation fractions of ammonia cluster ions, (NH{sub 3}){sub n}H{sup +}, n = 4-22, obtained by using a laser-based time-of-flight mass spectrometer equipped with a reflection. The newly derived values are found to be in good agreement with those reported earlier based on high-pressure mass spectrometry (HPMS) and several other methods employing data on dissociation dynamics. The various methods are found to be complementary. New measurements are reported for the metastable decay of deuterated cluster ions to investigatemore » the influence of mass effects on the dissociation rate. The decay fractions of the cluster ions (ND{sub 3}){sub n}D{sup +} are found to be consistently higher than those of the corresponding (NH{sub 3}){sub n}H{sup +} by 15%. The isotope effect can be well accounted for by considering the differences of their bulk heat capacities, and such studies are found to be a promising method for measuring the heat capacities of small, unsupported cluster systems.« less