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Effect of Emulsifying Agents on Inhibition of Enzymatic Browning in Apple Juice by Ascorbyl Palmitate, Laurate and Decanoate (1989)

SAPERS, G. M. ; EL-ATAWY, Y. S. ; HICKS, K. B. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 54 (1989), S. 0

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ISSN: 1750-3841

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology

Notes: The effects of emulsifying agents (EA) on the stability of aqueous dispersions of ascorbyl palmitate (AP), laurate (AL), and decanoate (AD), and on the effectiveness of these compounds as browning inhibitors in apple juice were investigated. The stability of 1.14 mM AP, AL or AD, dispersed in simulated juice, was greatly improved by the addition of hydrophilic EA's such as Tween 60. More lipophilic EA's also were effective in stabilizing AL and AD dispersions. However, the addition of EA's to these browning inhibitors failed to improve their effectiveness in juice and, in the case of Tweens, had a detrimental effect. These results are attributed to the solubilization or activation of bound polyphenol oxidase.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2621.1989.tb07958.x

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Defensive steroids from a carrion beetle (Silpha americana) (1985)

Meinwald, J. ; Roach, B. ; Hicks, K. ; [et al.]

Springer

Cellular and molecular life sciences 41 (1985), S. 516-519

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ISSN: 1420-9071

Keywords: Coleoptera ; chemical defense ; steroids ; pregnanes ; isoprenoids

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The defensive anal effluent discharged bySilpha americana in response to disturbance contains a mixture of steroids stemming from a glandular annex of the rectum. The compounds have been characterized as 15β-hydroxyprogesterone (1, principal component), 5β-pregnan-15β-ol-3, 20-dione (2), 5β-pregnan-3α, 15β-diol-20-one (3), 5β-pregnan-7β, 15β-diol-3,20-dione (4), 5β-pregnan-3α, 7β, 15β-triol-20-one (5), 5β-pregnan-16α-ol-3,20-dione (6), and 5β-pregnan-3α, 16α-diol-20-one (7), none previously found in insects. Bioassays with jumping spiders showed compounds1 and6 to be feeding deterrents at the 1 μg level.