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Accession number;00A0371180
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| Title;Measurement of Free Organic Acid Concentration in Tomato and Strawberry Fruit Juice by the Conductometric Method. |
| Author;
FUJIWARA TAKAYUKI
(Miekenkagakugijutsushinkose Nogise)
ISOZAKI MASAHIDE
(Miekenkagakugijutsushinkose Nogise)
KONISHI NOBUYUKI
(Miekenkagakugijutsushinkose Nogise)
SAKAKURA HAJIME
(Miekenkagakugijutsushinkose Nogise)
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Journal Title;Journal of the Japanese Society for Food Science and Technology
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Journal Code:F0895A
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ISSN:1341-027X
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VOL.47;NO.3;PAGE.227-232(2000)
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| Figure&Table&Reference;FIG.3, TBL.3, REF.18 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;An acid and sugar content analyzer (NH-1000, HORIBA Ltd.), for citrus fruit based on the conductometric method (acid) and on the refractometric method (Brix value), is put to practical use. To develop a simple method for measuring free organic acid concentration in tomato and strawberry juice, the accuracy of this equipment and the effects of some major compounds in these juice on analyzed values were studied. The values measured for tomato and strawberry juice by this equipment were higher than the titratable acid. Especially tomatoes with blossom-end rot showed very high measured values of acid content. It is considered that the acid content of tomato and strawberry juice obtained by the acid and sugar content analyzer need to be corrected using calibration equations, and that tomatoes with blossom-end rot should be removed before analysis. The organic acid composition of fruit juice varied slightly among tomato, strawberry and Satsuma mandarin samples, but the differences in conductivity of organic acids or the errors in the conversion factor for titratable acidity were not considered to be the main causes for the difference between titratable acid and the measured acid value by the acid and sugar content analyzer. The main positive element in all fruit juice samples was potassium, whereas the main inorganic anions were phosphate and chloride ions in tomato and Satsuma mandarin, and phosphate, chloride and nitrate ions in the strawberry sample. The difference between the measured acid values by the acid and sugar content analyzer and those by alkaline titration is highly correlative to both the positive element and anion concentrations in the fruit juice. (author abst.) |
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