Volatile Compounds and Chemical Changes in Ultrapasteurized Milk Packaged in Polyethylene Terephthalate Containers

Details

• Personal Author:
  Alvarez VB ; Ji T ; Solano-Lopez CE
• Description:
  The volatile compounds profile and chemical stability of ultrapasteurized 2% milk bottled in amber polyethylene terephthalate (PET) were studied along with its shelf life of 60 d at 5 C. Identification of volatile compounds using a solid-phase microextraction (SPME) technique with gas chromatography-mass spectrometry was performed in situ in the commercial product. Chemical stability was determined by measuring dissolved oxygen, free sulfhydryl groups, ascorbic acid, and headspace oxygen. The classes of volatile compounds identified were ketones, aldehydes, hydrocarbons, fatty acids, alcohol, and miscellaneous compounds. Volatile compounds found consistently during the storage period were 2-heptanone, methoxy-phenyl-oxime, decane, 1-ethyl-2,4-dimethyl-benzene, D-limonene, 2-nonanone, octanoic acid, dodecane, and 4-(1,1,3,3,-tetramethylbutyl) phenol. Possible products of lipid oxidation, such as hexanal, octanal, and nonanal, were also positively identified. Chemical stability of PET-bottled milk was demonstrated by the insignificant changes in pH or TA, with the exception of ascorbic acid concentration, which degraded in the product at 60 d of refrigerated storage. Sensory evaluation of the milk samples revealed that there is no noticeable oxidized or rancid off-flavor at 60 d of storage. [Description provided by NIOSH]
• Subjects:
  Aldehydes Butanones Dairy Products Formaldehyde Hydrocarbons Mass Spectrometry Occupational Health Safety
• Keywords:
  Alcohols Dairy-products Fatty-acids Gas-chromatography Ketones Mass-spectrometry Oxidation Sampling
• ISSN:
  0022-1147
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 3 ; OSHA Region 5 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  70
• Issue:
  6
• NIOSHTIC Number:
  nn:20028221
• Citation:
  J Food Sci 2005 Aug; 70(6):C407-C412
• CAS Registry Number:
  (+)-Limonene (CAS RN 5989-27-5) ; 2-Heptanone (CAS RN 110-43-0)
• Federal Fiscal Year:
  2005
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Food Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eb9c33fdc6d523d71abcf276ee9ea0a06e694a3ea42434bb2d639f5697cd2149a7b329319cd7e83b4aac856f44d206c8016905e5c5c4fff7f2841fb624a5796e
• Download URL:
  https://stacks.cdc.gov/view/cdc/189819/cdc_189819_DS1.pdf
• File Type:
  [PDF - 864.91 KB ]