MARC details
000 -LEADER |
fixed length control field |
05213nab a22006497a 4500 |
001 - CONTROL NUMBER |
control field |
39649 |
003 - CONTROL NUMBER IDENTIFIER |
control field |
CO-PlCIA |
005 - DATE AND TIME OF LATEST TRANSACTION |
control field |
20130510180942.0 |
040 ## - CATALOGING SOURCE |
Original cataloging agency |
CO-PlCIA |
Transcribing agency |
CO-PlCIA |
041 ## - LANGUAGE CODE |
Language code of text/sound track or separate title |
eng |
050 ## - LIBRARY OF CONGRESS CALL NUMBER |
Classification number |
41190 |
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
fixed length control field |
120504t1991 000 0seng d |
100 ## - MAIN ENTRY--PERSONAL NAME |
Personal name |
O'Brien, G.M. |
245 ## - TITLE STATEMENT |
Title |
Improved enzymic assay for cyanogens in fresh and processed cassava |
300 ## - PHYSICAL DESCRIPTION |
Extent |
56(2):277-289 |
520 ## - SUMMARY, ETC. |
Summary, etc |
Se modifico el ensayo para cianogenos de yuca desarrollado por el Instituto de Recursos Naturales para asi superar algunos de los problemas encontrados cuando el ensayo se aplica a productos de la yuca. La inclusion de 25 por ciento de etanol en el medio de extraccion aumento el vol. de extracto recuperado de los productos de la yuca procesados al calor, elimino la necesidad de centrifugacion y no interfirio con ningun aspecto del ensayo. Se observo una mayor recuperacion de cianohidrina y se cambio la estimacion del contenido de cianogenos para considerar el vol. total del extracto. Se logro el examen de los 3 cianogenos (glucosido, cianohidrina y cianuro libre) por separado mediante el uso de alicuotas del extracto como tampon seguido del tratamiento apropiado. Se demostro la importancia del analisis del cianuro libre (HCN) a pH 4. Por encima de este valor de pH, la degradacion de cianohidrina tambien produce cianuro libre, suscitando valores equivocos. Se determino la eficiencia del medio de extraccion para recuperar la linamarina y la cianohidrina adicionadas a partir de productos alimenticios derivados de la yuca. Se mejoro la recuperacion de cianohidrina utilizando medio acido/etanol. Se examino la estabilidad de los cianogenos en el medio de extraccion acido/etanol a temp. ambiente y temp. de refrigeracion. Durante un periodo de 2 meses, los extractos refrigerados mostraron una variacion aceptable en comparacion con la variacion normal dentro del ensayo (5 por ciento) para los cianogenos totales y no glicosidicos pero los niveles de cianuro libre presentaron grandes disminuciones (perdidas de 15-56 por ciento). Puesto que falta determinar la toxicidad relativa de los 3 cianogenos, la cantidad relativa de cada cianogeno puede ser importante al evaluar la seguridad de los productos de la yuca. (RA-CIAT) |
-- |
spa |
520 ## - SUMMARY, ETC. |
Summary, etc |
The assay for cassava cyanogens developed at the Natural Resources Institute has been modified to overcome some of the problems encountered when the assay is applied to cassava products. Inclusion of 25 percent ethanol in the extraction medium increased the volume of recovered extract from heat-processed cassava products, eliminated the need for centrifugation and did not interfere with any aspect of the assay. Greater cyanohydrin recovery was noted and the calculation for cyanogen contents was changed to take into account the total extract volume. The separate assay of the three cyanogens (glucosides, cyanohydrins and free cyanide) was achieved by buffering aliquots of the extract followed by appropriate treatment. The importance of assaying for free cyanide (HCN) at pH 4 was demonstrated. Above this pH, cyanohydrin degradation also produces free cyanide, giving rise to misleading values. The efficiency of the extraction medium in recovering added linamarin and cyanohydrin from cassava foods was determined. Recoveries of cyanohydrin were improved using the ethanol/acid medium. The stability of the cyanogens in the ethanol/acid extraction medium was tested at ambient and refrigeration temperatures. Over a two-month period, refrigerated extracts showed acceptable variation as compared with normal variation within the assay (5 percent) for total and non-glycosidic cyanogens but the levels of free cyanide showed heavy losses (15-56 percent lost). Since the relative toxicities of the three cyanogens have yet to be ascertained, the relative amount of each cyanogen may be important when assessing the safety of cassava products. (AS) |
-- |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Manihot esculenta |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Cyanides |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Enzymes |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
HCN CONTENT |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Analysis |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
LINAMARIN |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
LINAMARASE |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
pH |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
GARI |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Storage |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Temperature |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Climatic requirements |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
COMPOSITION |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Cultivation |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
CYANOGENIC GLUCOSIDES |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
FOOD PRODUCTS |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Starch crops |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Uses |
9 (RLIN) |
eng |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Manihot esculenta |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Cianuros |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Enzimas |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
CONTENIDO DE HCN |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
ANALISIS |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
LINAMARINA |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
LINAMARASA |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
pH |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
GARI |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Almacenamiento |
9 (RLIN) |
spa |
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
Topical term or geographic name as entry element |
Temperatura |
9 (RLIN) |
spa |
653 ## - INDEX TERM--UNCONTROLLED |
Uncontrolled term |
Yuca |
-- |
spa |
653 ## - INDEX TERM--UNCONTROLLED |
Uncontrolled term |
ArtÃculos en revistas |
-- |
spa |
653 ## - INDEX TERM--UNCONTROLLED |
Uncontrolled term |
Journal articles |
-- |
spa |
653 ## - INDEX TERM--UNCONTROLLED |
Uncontrolled term |
Cassava |
-- |
spa |
653 ## - INDEX TERM--UNCONTROLLED |
Uncontrolled term |
Journal article |
-- |
eng |
700 ## - ADDED ENTRY--PERSONAL NAME |
Personal name |
Taylor, A.J. |
700 ## - ADDED ENTRY--PERSONAL NAME |
Personal name |
Poulter, N.H. |
773 ## - HOST ITEM ENTRY |
Title |
Journal of the Science of Food and Agriculture |
Place, publisher, and date of publication |
1991 |
998 ## - Data Base |
DataBase |
YUCA |
942 ## - ADDED ENTRY ELEMENTS (KOHA) |
Source of classification or shelving scheme |
Library of Congress Classification |
Koha item type |
Journal Article |