Nondestructive Method for Measuring Fruit Ripening of 'La France' Pears Using a Laser Doppler Vibrometer
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Accession number;06A0073883
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| Title;Nondestructive Method for Measuring Fruit Ripening of 'La France' Pears Using a Laser Doppler Vibrometer |
| Author;
MURAYAMA HIDEKI
(Yamagata Univ., Tsuruoka, Jpn)
KONNO ICHIRO
(Yamagata Univ., Tsuruoka, Jpn)
TERASAKI SHOJI
(Matsushita-kotobuki Electronics Ind., Ltd., Ehime, Jpn)
YAMAMOTO RYOICHI
(Tezukayama Coll., Nara, Jpn)
SAKURAI NAOKI
(Hiroshima Univ., Higashi-hiroshima, Jpn)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.75;NO.1;PAGE.79-84(2006)
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| Figure&Table&Reference;FIG.5, REF.29 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The elastic index of 'La France' pears was measured during ripening by a laser Doppler vibrometer (LDV). Fruit were harvested thrice during the 1999 season. After harvest, samples of fruit were just allowed to ripen at 20.DEG.C.. A portion of optimum-harvested fruit was stored at 1.DEG.C. for 2 weeks or 1, 2 or 4 months and transferred to 20.DEG.C. for ripening. The value for the elastic index of early-harvested fruit was 36.4*10'5'Hz'2' g'2/3' just after harvest; the values declined with a function of time. The elastic index of optimum-harvested pear showed a bi-phasic decrease, whereas that of late-harvested fruit exhibited a sharp decrease with a single-phase pattern as the fruit ripened. Storage reduced the elastic index and modified the decreasing pattern. Optimum-harvested fruit that were stored at 1.DEG.C. for 2 weeks showed a slight bi-phasic decrease in the elastic index, whereas fruit stored for 1 or 2 months did not. Fruit stored at 1.DEG.C. for 4 months showed the lowest initial value (4.3*10'5'Hz'2' g'2/3') and little decrease. The correlation coefficients between flesh firmness, measured by a conventional probe method and the elastic index, was significantly high, independent of harvest date or storage periods. The only exception was with fruit stored at 1.DEG.C. for 4 months. These results indicate that 'La France' pear fruit exhibit bi-phasic decreases in the elastic index when they were harvested at optimum period and stored for periods up to 2 weeks; furthermore, fruit firmness of 'La France' pears is amenable to analysis by an LDV. (author abst.) |
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