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New Prenylflavones and Dibenzoylmethane from Glycyrrhiza inflata (1992)

Kajiyana, Kiichiro ; Demizu, Sachio ; Hiraga, Yukio ; [et al.]

s.l. : American Chemical Society

Journal of natural products 55 (1992), S. 1197-1203

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ISSN: 1520-6025

Source: ACS Legacy Archives

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1021/np50087a005

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Comparison of Stevia plants grown from seeds, cuttings and stem-tip cultures for growth and sweet diterpene glucosides (1984)

Tamura, Yukiyoshi ; Nakamura, Shigeharu ; Fukui, Hiroshi ; [et al.]

Springer

Plant cell reports 3 (1984), S. 180-182

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ISSN: 1432-203X

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The growth and sweet diterpene glucosides of Stevia plants propagated by stem-tip cultures were compared with those of the control plants propagated by seeds. There was no significant difference between the two groups both in growth and in chemical composition. As for the contents of sweet diterpene glucosides, however, the clonal plants showed significantly smaller variations than the sexually propagated plants; they were almost as homogeneous as the plants propagated by cuttings. These results suggest that the clonal propagation by stem-tip culture is an effective method of obtaining a population of uniform plants for the production of sweet diterpene glucosides.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00270194

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Clonal propagation of Stevia rebaudiana Bertoni by stem-tip culture (1984)

Tamura, Yukiyoshi ; Nakamura, Shigeharu ; Fukui, Hiroshi ; [et al.]

Springer

Plant cell reports 3 (1984), S. 183-185

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ISSN: 1432-203X

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Clonal propagation of Stevia rebaudiana has been established by culturing stem-tips with a few leaf primordia on an agar medium supplemented with a high concentration (10 mg/l) of kinetin. Anatomical examination has suggested that these multiple shoots originate from a number of adventitious buds formed on the margin of the leaf. Innumerable shoots can be obtained by repeating the cycle of multiple-shoot formation from a single stem-tip of Stevia. These shoots produce roots when transferred to a medium containing NAA (0.1 mg/l) without kinetin. The regenerated plantlets can be transplanted to soil.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00270195

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Lipase-Catalyzed Synthesis of Capsaicin Analogs by Amidation of Vanillylamine with Fatty Acid Derivatives (1998)

Kobata, Kenji ; Kawamura, Momoyo ; Toyoshima, Makiko ; [et al.]

Springer

Biotechnology letters 20 (1998), S. 451-454

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ISSN: 1573-6776

Source: Springer Online Journal Archives 1860-2000

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: Abstract Various lipases catalyzed the synthesis of capsaicin analogs by amidation of vanillylamine with fatty acid derivatives in a two-phase system. When methyl myristate was employed as an acyl donor, moderate yields, 40-59%, of capsaicin analog (3) were obtained using Novozym 435, Lipase AK or Lipase PS. Several capsaicin analogs having 4-18 carboxyl carbons were also synthesized from the corresponding fatty acid or its methyl or ethyl ester in 2-44% yields.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1005479910765

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Lipase-catalyzed synthesis of capsaicin analogs by transacylation of capsaicin with natural oils or fatty acid derivatives in n-hexane (1999)

Kobata, Kenji ; Kobayashi, Mamiko ; Tamura, Yukiyoshi ; [et al.]

Springer

Biotechnology letters 21 (1999), S. 547-550

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ISSN: 1573-6776

Keywords: capsaicin analog ; lipase ; natural oil ; transacylation ; triacylglyceride

Source: Springer Online Journal Archives 1860-2000

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: Abstract Transacylation of capsaicin with triolein using a commercial lipase gave olvanil in an 85% yield at 70 °C for 144 h. When olive oil was employed, the major product was olvanil (62%). Safflower oil gave a mixture of olvanil (39%) and linoleoyl vanillylamide (32%). Perilla oil gave linolenoyl vanillylamide (13%). Myristic acid and its methyl ester could be used as an acyl donor, and myristoyl vanillylamide was obtained in 20–78% using several lipases.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1005567923159

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