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Electrophoretic determination of calystegines A3 and B2 in potato.

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Potatoes, members of the Solanaceae plant family, contain calystegines, water-soluble nortropane alkaloids, which are biologically active as glycosidase inhibitors. The content of calystegines A(3) and B(2) in different varieties of potato and in various parts of the tubers (whole potato, peel,

Glycoalkaloid and calystegine levels in table potato cultivars subjected to wounding, light, and heat treatments.

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Potato tubers naturally contain a number of defense substances, some of which are of major concern for food safety. Among these substances are the glycoalkaloids and calystegines. We have here analyzed levels of glycoalkaloids (α-chaconine and α-solanine) and calystegines (A₃, B₂, and B₄) in potato

Putrescine N-methyltransferase in Solanum tuberosum L., a calystegine-forming plant.

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Putrescine N-methyltransferase (PMT, EC 2.1.1.53) catalyses the first specific step in the biosynthesis of tropane and nicotine alkaloids. Potato (Solanum tuberosum L.) contains neither nicotine nor the medicinal tropane alkaloids hyoscyamine or scopolamine, but calystegines. They are nortropane

Calystegines are Potential Urine Biomarkers for Dietary Exposure to Potato Products

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Scope: Metabolites derived from specific foods present in urine samples can provide objective biomarkers of food intake (BFIs). This study investigated the possibility that calystegines (a class of iminosugars) may provide BIFs for potato

Glycoalkaloid and calystegine contents of eight potato cultivars.

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Diverse procedures have been reported for the separation and analysis by HPLC of the two major glycoalkaloids present in potatoes, alpha-chaconine and alpha-solanine. To further improve the usefulness of the HPLC method, studies were carried out on the influence of several salient parameters on the

Comparison of the calystegine composition and content of potato sprouts and tubers from Solanum tuberosum Group Phureja and Solanum tuberosum Group Tuberosum.

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The calystegines detected in tubers from 17 Phureja ( S. tuberosum Group Phureja) lines and five Tuberosum ( S. tuberosum Group Tuberosum) cultivars were identified as the A 3 and B 2 structural types. Their concentration in whole tubers was of a similar order of magnitude in both species, as was

Molecular cloning, expression and characterization of tropinone reductase II, an enzyme of the SDR family in Solanum tuberosum (L.).

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Calystegines are nortropane alkaloids that are found in Solanaceae containing the classical tropane alkaloids hyoscyamine and scopolamine, and in other Solanaceae such as potato, Solanum tuberosum (L.). Calystegines are assumed to derive from the classical tropane alkaloid pathway. We isolated a

Immunolocalisation of two tropinone reductases in potato (Solanum tuberosum L.) root, stolon, and tuber sprouts.

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Tropinone reductases (TRs) are essential enzymes in the tropane alkaloid biosynthesis, providing either tropine for hyoscyamine and scopolamine formation or providing pseudotropine for calystegines. Two cDNAs coding for TRs were isolated from potato (Solanum tuberosum L.) tuber sprouts and expressed

Calystegines in potatoes with genetically engineered carbohydrate metabolism.

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Calystegines are hydroxylated nortropane alkaloids derived from the tropane alkaloid biosynthetic pathway. They are strong glycosidase inhibitors and occur in vegetables such as potatoes, tomatoes, and cabbage. Calystegine accumulation in root cultures was described to increase with carbohydrate

Potato plants with genetically engineered tropane alkaloid precursors.

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UNASSIGNED Solanum tuberosum tropinone reductase I reduced tropinone in vivo. Suppression of tropinone reductase II strongly reduced calystegines in sprouts. Overexpression of putrescine N -methyltransferase did not alter calystegine accumulation. Calystegines are hydroxylated alkaloids formed by

The effects of calystegines isolated from edible fruits and vegetables on mammalian liver glycosidases.

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The polyhydroxylated nortropane alkaloids called calystegines occur in many plants of the Convolvulaceae, Solanaceae, and Moraceae families. Certain of these alkaloids exhibit potent inhibitory activities against glycosidases and the recently demonstrated occurrence of calystegines in the leaves,

Potato glycoalkaloids and metabolites: roles in the plant and in the diet.

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Potatoes, members of the Solanaceae plant family, serve as major, inexpensive low-fat food sources providing energy (starch), high-quality protein, fiber, and vitamins. Potatoes also produce biologically active secondary metabolites, which may have both adverse and beneficial effects in the diet.

Analysis of biologically active compounds in potatoes (Solanum tuberosum), tomatoes (Lycopersicon esculentum), and jimson weed (Datura stramonium) seeds.

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Potatoes and tomatoes, members of the Solanaceae plant family, serve as major, inexpensive low-fat food sources providing for energy, high-quality protein, fiber, vitamins, pigments, as well as other nutrients. These crops also produce biologically active secondary metabolites, which may have both

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