摘要:

AbstractThe species which grow wild and are used as oregano in Greece areCoridothymus capltatus(L.) Reichenb. fil.,Satureja thymbra L., Origanum onitesL. andO. vulgareL. Because of their economic importance, we studied their distribution in Greece and their essential oils. By examining various populations from all over the country, intraspecific variability was detected as to essential oil contents and to the carvacrol content of the oils, the main component responsible for their use as oregano. The species were evaluated on the basis of their oil and carvacrol contents.O. onitesproved to be the most stable species, that was always rich in carvacrol, whereasO. vulgarewas the most variable one.O. vulgaresubsp.hirtum(Link) letswaart was very rich in essential oil; in some cases a content of about 8% was found and a carvacrol content ranging from 2.4% to 95%.O. vulgaresubsp.vulgarecontained only small amounts of essential oil (<0.3%) and amounts of carvacrol below 0.1 %. For these reasons the latter subspecies should not be used as oregano, although it belongs to the genusOriganum.

ISSN:0882-5734    

DOI:10.1002/ffj.2730040102

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractGingerols, the pungent principles from ginger, are thermally labile. Two degradation pathways have been established: retro‐aldol condensation to zingerone and the appropriate aldehyde, and dehydration to shogaols. Evidence is now presented that suggests that the shogaols are also sensitive to certain processing conditions. A series of gingerols ethylated at the aliphatic hydroxyl group has been detected in commercial extracts of ginger. Ethanol is commonly used to extract the pungent principles from the rhizomes. The addition of ethanol to α‐β‐unsaturated ketones is well known and such a reaction with the shogaols is the likely origin of theO‐ethyl

ISSN:0882-5734    

DOI:10.1002/ffj.2730040103

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractComprehensive GC‐MS analyses of the volatile oil from leaves ofOcimum canumSims revealed the occurrence of eugenoi as the major constituent, in addition to 28 other compounds. Since methyl cinnamate, camphor, citral and linalol chemotypes ofO. canumhave previously been found, a new type is now being reporte

ISSN:0882-5734    

DOI:10.1002/ffj.2730040104

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe composition of the volatile leaf oil ofPinus ponderosaDougl. Ex. P. Lawson was re‐examined by fused silica capillary gas chromatography‐ion trap mass spectroscopy. The leaf oil from Washington was high in α‐and β‐pinenes (9.1% and 37.9%), car‐3‐ene (19.3%), α‐terpineol (6.2%), myrcene (4.1%) and terpinolene (3.1%). A total of 52 components were identified. This analysis is compared and contrasted with the previous analyses which reported from 8 to 17 monoterpenoids plus estragole in Ponderosa pine leaf oil. The utility of ion trap mass spectroscopy is shown to be of general use for the identification of flavour

ISSN:0882-5734    

DOI:10.1002/ffj.2730040105

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractCurcuma aromaticaSalisb. volatiles were examined by a combination of GC, GC‐MS, Co‐GC, CC, TLC and HPLC techniques. Out of the 45 constituents separated by GC, 32 were identified, the most notable being germacrene‐D, curzerene, germacrone, curzerenone, xanthorrhizol, curcuphenol and hydroxyisogermafurenolide. The composition ofC. aromaticaoil is compared with those reported for otherCurcumasp

ISSN:0882-5734    

DOI:10.1002/ffj.2730040106

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractCurcuma longa L.(synC. domesticaVal.) rhizomes were extracted with ethyl acetate; the miscella was partially desolventized and the curcuminoids precipitated atca25° C. The work‐up afforded pigments in 2.77% yield with colour value 14300 equivalent to 90.42% curcumin and demonstrated the use of ethyl acetate, which has a benign toxicological profile, for the recovery of the turmeric coloura

ISSN:0882-5734    

DOI:10.1002/ffj.2730040107

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractLeaf oil ofCitrus jambhiridistributed in the sub‐Himalayas has been chemically investigated. Oil samples collected under the different phenological conditions during a year revealed a maximum yield of oxygenated terpenes at the early fruiting stage. The study also confirms that chemically this oil is altogether different from the Californian oil. The oil after deterpenation was found to be similar to Petitgrain citron oi

ISSN:0882-5734    

DOI:10.1002/ffj.2730040108

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe dynamics of accumulation of mono‐and sesquiterpenes in leaves and fruits of a mandarin (Citrus unshiuMarc.) during ontogenesis was studied. Limonene, linalol,p‐cymene, β‐elemene are found to accumulate intensively in fruits prior to ripening. From that time till the physiological maturity of fruits, the biosynthesis of γ‐terpinene, β‐elemene and especially that of limonene increases, while the content of linalol, β‐caryophyllene, p‐cymene and α‐terpineol decreases. From the beginning of time of blossoming until the commencement of fruit ripening, the content of γ‐terpinene andp‐cymene varies essentially in leaves. From October the content of mono and sesquiterpenoids decreases sharply and remains practically unchanged during

ISSN:0882-5734    

DOI:10.1002/ffj.2730040109

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe essential oil, extracted by a current of air from the leaves ofLippia sidoidesCham, heated in a microwave oven for 5 minutes, was qualitatively identical with that obtained by conventional steam distillation for 60–90 minute

ISSN:0882-5734    

DOI:10.1002/ffj.2730040110

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

ISSN:0882-5734    

DOI:10.1002/ffj.2730040111

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY