Glycerol Ether in Colostrum and Milk from Cow, Goat, Pig, and Sheep

Ahrné, Lennart; Björck, Lennart; Raznikiewicz, Tadeusz; Claesson, Olof

doi:10.3168/jds.s0022-0302(80)83001-3

Cited by 17 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There was a substantial peak during the colostrum phase both in alkylglycerol concentration in colostrum and in daily alkylglycerol secretion. This corresponds well with levels previously reported (Ahrne et al 1980). Differences between colostrum and milk were significant (P < 0-001).…”

Section: Resultssupporting

confidence: 92%

“…Colostrum and milk fat were extracted by the BDI procedure (Driessen et al 1977). Alkylglycerols in colostrum and milk fat were determined by gas liquid chromatography (GLC) (Carlo Erba Strumentazione, Fractovap 2350, Rodano Milan, Italy) after their methanolysis as isopropylidene derivatives by conditions previously reported (Ahrne et al 1980). As internal standard heptadecyldipalmitoylglycerol, synthesized according to Baumann & Mangold (1964), was used.…”

Section: Methodsmentioning

confidence: 99%

“…Colostrum is known to be richer in neutral alkylglycerols than is milk (Ahrne et al 1980). Synthesis and degradation of ether lipids occur in the bovine udder both in the colostrum and milk phases .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Ahrné

Björck

Claesson

1983

Journal of Dairy Research

Self Cite

View full text Add to dashboard Cite

The concentrations of dihydroxyacetone phosphate (DHAP), glycerol-3-phosphate (GP), glucose and alkylglycerols were measured in bovine colostrum and milk. Concentrations of GP were higher in colostrum than in milk, and corresponded to intracellular concentrations at the onset of lactation. This suggests that GP equilibrates over the apical membrane at onset of lactation, which is believed to occur also in full lactation. The ratio of DHAP to GP showed a peak in colostrum that was more than twice that in milk, indicating that concentration changes in colostrum/milk were not caused by dilution. DHAP was positively correlated to metabolical compounds such as glucose and alkylglycerols. As DHAP is a required precursor for alkylglycerol synthesis, the positive correlation suggests that DHAP may be limiting for alkylglycerol synthesis and thus could explain the elevated levels of alkylglycerols found in colostrum.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Ahrné

Björck

Claesson

1983

Journal of Dairy Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, most absorption studies have been performed with unesterified alkyl glycerols while natural ly-occurring ether lipids are almost always found as esters. There is also evidence that exogenous alkyl glycerols are incorporated into alkyl and alk-l'-enyl glycerophospholipids of the intestine [10,11] and liver [5], As milk and more so colostrum of several species contains alkyl glycerols [12,13], it was interesting to determine to what extent dietary ether lipids are incorporated into the tissues of the neonatal rat. This product was isolated on Silica gel G layers and eluted with hexane:diethyl ether, 1:1.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Dietary 1–<i>O</i>-Alkyldiacyl Glycerols into Tissue Lipids of Neonatal Rats

Ahrné¹,

Björck²,

Claesson³

1982

Ann Nutr Metab

Self Cite

View full text Add to dashboard Cite

³H-[9,10]-l-O-alkyl-2,3-diacyl glycerols were administered per os to suckling rats at 1, 3, 6, 9 and 18 days of age. 12 h after administration the animals were killed and the distribution of the labelled material was analysed by whole-body autoradiography. The brown adipose tissue (BAT), intestine and liver showed the highest levels of label at all ages. The lipid content of BAT, intestine and liver were separated into lipid classes, which were analysed for their ³H levels. About 30% of the recovered label was found in the phospholipid fraction at all ages. Little of the administered dose was recovered as alkyl glycerols: 5% in the 1-day-old rat decreasing to < 1.5% at 18 days of age, indicating that dietary alkyl glycerols only to a very limited degree are incorporated in tissue ether lipids in the young rat.

show abstract

Butter

Hettinga¹

2005

Bailey's Industrial Oil and Fat Products

View full text Add to dashboard Cite

Butter is one of the oldest forms of preserving fat components of milk. Its manufacture dates back to some of the earliest historical records. The evolution of the art of buttermaking has been associated with the development and use of equipment. The construction of creaming and buttermaking equipment in the eighteenth century led to the appearance of the barrel churn. Creaming was at first done by a method called shallow pan. This was followed by a deep‐setting system. This shortened process time and produced a better quality cream. In 1879, cream separators for fully continuous operation were produced. The Babcock test assisted in the development of the butter industry. This test determines the percentage of fat in milk and cream. Other developments included the use of pasteurization, the use of pure cultures of lactic acid and bacteria, and the use of refrigeration. Multiple butter fat products include butter oils, anhydrous butter fat, butter fat‐vegetable oils, and fractionated butter fats. Preservation of butter fat today involves the processing of butter fat to anhydrous butter oil. Shelf life is improved because the butter oil is hermetically packaged under nitrogen. Recent times have seen a decline in the consumption of butter. This decline contradicts all historical patterns for butter fat consumption. Reasons for decline are noted. This chapter provides data on chemical composition, marketing, technology, processing, quality, legal restrictions, and uses.

show abstract

Glycerol Ether in Colostrum and Milk from Cow, Goat, Pig, and Sheep

Cited by 17 publications

References 17 publications

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Incorporation of Dietary 1–<i>O</i>-Alkyldiacyl Glycerols into Tissue Lipids of Neonatal Rats

Butter

Contact Info

Product

Resources

About

Glycerol Ether in Colostrum and Milk from Cow, Goat, Pig, and Sheep

Cited by 17 publications

References 17 publications

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Alkylglycerols in bovine colostrum and milk in relation to precursor levels

Incorporation of Dietary 1&ndash;<i>O</i>-Alkyldiacyl Glycerols into Tissue Lipids of Neonatal Rats

Butter

Contact Info

Product

Resources

About

Incorporation of Dietary 1–<i>O</i>-Alkyldiacyl Glycerols into Tissue Lipids of Neonatal Rats