Hydrolysis and esterification of vitamin A during absorption

Eden, E.; Sellers, K.C.

doi:10.1042/bj0460261

Cited by 29 publications

(5 citation statements)

References 6 publications

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“…This would be expected according to the theory of Glover et al (1947), who suggested that the alcohol form is in equilibrium with the liver vitamin A. A grazing cow ingests 24 r-blood and lymph (Glover et al 1947;Eden & Sellers, 1950;Thompson, Braude, Coates, Cowie, Ganguly & Kon, 1950) is concentrated into the milk secretion without first passing into the liver. That the fat content of the milk is many times more concentrated than blood serum is well known.…”

Section: Discussionmentioning

confidence: 92%

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The partition of carotenoids and vitamin A in the colostrum and milk of the cow and the goat

Chanda

1953

J. Agric. Sci.

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The partition of carotenoids and vitamin A in the colostrum of nine cows and six goats and in the milk of three cows and two goats was determined using chromatographic and spectrophotometric methods. The following were the main results:1. The content of β-carotene and vitamin A in the colostrum decreased rapidly during the first nine milkings in both the cow and the goat. The rates of decline were logarithmic. Logarithmic regressions also showed that the decreases in β-carotene were more rapid than those of vitamin A.2. The heifers secreted more vitamin A in their colostral fat than did cows on the same ration. The vitamin A content of the colostral fat of goats was greater during the first lactation than in later lactations. There was no difference in the rates of decrease of the vitamin A content of heifer and cow colostrum, but the difference between the rates of decreases of colostral vitamin A of first and later lactation goats was significant.3. The colostral fat of cows at pasture contained more vitamin A than that of cows on winter rations. There was no difference between the logarithmic rates of decrease in the two groups during the first nine milkings. The colostral fat of four goats receiving winter rations was richer in vitamin A than that of three cows treated similarly, and this superiority of the goat over the cow persisted throughout lactation.4. There was no difference between the carotene content of the colostral fat of the first and later lactation cows. The yield of fat and β-carotene of the heifers was smaller than that of the cows. Cows at pasture secreted more β-carotene in their colostrum than the cows on winter rations. The presence of β-carotene was demonstrated in goat colostrum, although mature goat milk was free from any measurable quantity of carotenoids.

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Section: Discussionmentioning

confidence: 92%

“…The variation in the total vitamin A of the same cow was mostly caused by changes in the amount of the esterified form. Eden & Sellers (1950) showed that the increase in plasma vitamin A after oral adminis-tration of the vitamin was all in the esterified form. The amount of the alcohol form of the vitamin remained unchanged.…”

Section: Discussionmentioning

confidence: 99%

The partition of carotenoids and vitamin A in the colostrum and milk of the cow and the goat

Chanda

1953

J. Agric. Sci.

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“…Ion exchange in resins has been investigated as an equilibrium or kinetic phenomenon (104, HO, 141, 161, 225, 009) and as a statistical phenomenon (93). The hydrated resin may7 be treated as a solid solution (110,180) exhibiting the Donnan equilibrium phenomenon (65). Equilibria with resins have yielded dissociation constants of radium-organic acid complexes (34%) and have demonstrated the formation of colloids (radiocolloids) of zirconium and niobium (341).…”

Section: Terminologymentioning

confidence: 99%

Chromatographic Systems

Strain¹

1951

Anal. Chem.

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“…Der Ort der maximalen Resorption des Vitamin A ist der obere und mittlere Dünndarm [12,34,41]. Jedoch hat auch der Dickdarm, wie in Tierversuchen gezeigt werden konnte, noch die Fähigkeit, Vitamin A zu resorbieren [22], Der Abtransport des Vitamin A-Palmitates aus der Darmwand erfolgt über den Ductus thoracicus [26] Thiamin: Die Thiaminausscheidung mit dem Urin schwankte bei wiederholter Bestimmung zwischen 150 und 600 meg Thiam in je Tag und spricht som it für eine ausreichende Thiaminversorgung [32].…”

unclassified

Vitaminresorption nach Pankreatektomie

Kasper¹

1967

Digestion

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Hydrolysis and esterification of vitamin A during absorption

Cited by 29 publications

References 6 publications

The partition of carotenoids and vitamin A in the colostrum and milk of the cow and the goat

The partition of carotenoids and vitamin A in the colostrum and milk of the cow and the goat

Chromatographic Systems

Vitaminresorption nach Pankreatektomie

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