Determination of total glycoalkaloids in potato tubers using a modified titration method

Bushway, Rodney J.; Wilson, A. M.; Bushway, A. A.

doi:10.1007/bf02854157

Cited by 29 publications

(17 citation statements)

References 6 publications

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“…Total glycoalkaloid (TGA) content Total gtycoalkaloids were extracted using chloroform-methanql (1:2, vhr) and precipitated using concentrated ammonium hydroxide (Bushway et al, 1980). Total glycoalkaloids were quantified by nonaqueous titration using bromphenol blue (Fitzpatrick et al, 1978).…”

Section: Ascorbic Acidmentioning

confidence: 99%

Effect of Packaging Materials on the Chemical Composition of Potatoes

Gosselin

Mondy

1989

Journal of Food Science

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Russet Burbank and Chieftain potatoes were packaged in either mesh, paper or polyethylene bags and compared in chemical composition after 1, 4, and 8 wk of storage at 20°C. Potatoes were analyzed for weight loss, discoloration, phenols, ascorbic acid, glycoalkaloids and nitrate-nitrogen. Potatoes packaged in polyethylene were lowest in weight loss, ascorbic acid and nitrate-nitrogen and highest in discoloration, phenols and glycoalkaloids than those packaged in mesh or paper. Potatoes packaged in paper were lowest in discoloration and phenols and highest in ascorbic acid. There were no significant differences in weight loss, glycoalkaloids or nitrate-nitrogen between potatoes packaged in mesh on paper.

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Section: Ascorbic Acidmentioning

confidence: 99%

Effect of Packaging Materials on the Chemical Composition of Potatoes

Gosselin

Mondy

1989

Journal of Food Science

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“…Total glycoalkaloids were extracted by the method of Bushway et al (1980) using chloroform-methanol (l:2; v/v) followed by precipitation of TGA in concentrated ammonium hydroxide. TGA was quantified by nonaqueous titration using bromphenol blue (Fitzpatrick and Osman, 1974).…”

Section: Katahdin Potatoes Grown At the Cornell Vegetable Researchmentioning

confidence: 99%

Changes in Total Phenolic, Total Glycoalkaloid, and Ascorbic Acid Content of Potatoes as a Result of Bruising

Mondy

Leja

Gosselin

1987

Journal of Food Science

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The effect of bruising on total phenols, total glycoalkaloids (TGA), and ascorbic acid content of Katahdin potatoes was studied. Following bruising, tubers were stored at either 5" or 20°C for I, 3, 6, and I2 wk. Unbruised whole tubers served as controls and bruised halves were compared with unbruised halves. Both halves of bruised tubers were higher in phenols, TGA and lower in ascorbic acid than unbruised controls. Bruised halves contaihed significantly more phenols, TGA and less ascorbic acid than unbiuised halves. Storage temperature did not affect ascorbic acid cdntent but the greatest accumulation of phenols occurred at 5°C and the highest TGA at 20°C storage temperature. Cortex tissue was significantly lower in ascorbic acid than pith tissue.

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“…The TGA concentration of potato tubers was determined according to the modified nonaqueous titration method of Bushway et al (1980). The TGA concentration of potato tubers was determined according to the modified nonaqueous titration method of Bushway et al (1980).…”

Section: Methodsmentioning

confidence: 99%

“…Determination of Total Glycoalkaloids (TGA). The TGA concentration of potato tubers was determined according to the modified nonaqueous titration method of Bushway et al (1980). Tomatine (obtained from Sigma) was used as the standard.…”

Section: Methodsmentioning

confidence: 99%

Effect of soil and foliar application of molybdenum on the glycoalkaloid and nitrate concentration of potatoes

Mondy¹,

Munshi²

1993

J. Agric. Food Chem.

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The effect of two methods of molybdenum (Mo) application, banding and foliar spray, on total glycoalkaloid (TGA) and nitrate nitrogen (N03-N) concentration of Katahdin tubers was studied and compared during each of 2 consecutive years. Sodium molybdate (NazMoO4) was the source of Mo used. The levels of NazMoO4 application were 0.0,2.8 (1.25),5.6 (2.51, and8.4 (3.75) kglha (ppm soil). Banding of NapMoO4 was carried out during the time of planting, while foliar spray was applied 13 weeks following planting when the nitrate reductaseactivity was at its peak level. Both TGAand N03-N were significantly (p < 0.01) reduced by all levels of Mo application and by both methods of application. Nitrate reductase activity of the leaves was significantly @ < 0.05 for banding and p < 0.01 for foliar application) increased by Mo application. Tuber Mo concentration was significantly (p < 0.01) increased at all levels of application but did not reach levels that would be toxic for human consumption. Foliar spray resulted in significantly greater decreases in TGA and Nos-N and increases in nitrate reductase activity and molybdenum concentration than banding.

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Determination of total glycoalkaloids in potato tubers using a modified titration method

Cited by 29 publications

References 6 publications

Effect of Packaging Materials on the Chemical Composition of Potatoes

Effect of Packaging Materials on the Chemical Composition of Potatoes

Changes in Total Phenolic, Total Glycoalkaloid, and Ascorbic Acid Content of Potatoes as a Result of Bruising

Effect of soil and foliar application of molybdenum on the glycoalkaloid and nitrate concentration of potatoes

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