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首页> 外文期刊>Journal of near infrared spectroscopy >Assessment of titratable acidity in fruit using short wave near infrared spectroscopy. Part B: intact fruit studies
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Assessment of titratable acidity in fruit using short wave near infrared spectroscopy. Part B: intact fruit studies

机译：使用短波近红外光谱法评估水果中的可滴定酸度。 B部分：完整的水果研究

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Interactance spectra (700-1100 nm) of intact fruit possess features interpreted as being due to the dilution and perturbation of water OH stretching and combination bands (with the second and third overtones of OH stretching at 960 nm and 740 nm, respectively), while the contribution from citric acid CH_2 and OH stretching and combination bands are not obvious. A model developed using interactance spectra collected from the cut surfaces of lime fruit (mean±SD of 7.3±0.51 g citric acid equivalents 100 mL~(-1), units subsequently presented as % w/v) achieved prediction results of RMSEP=0.16%, r_p~2=0.79, bias=-0.03%. However, for intact lime fruit, model calibration results (RMSECV=0.16, r_(cv)~2=0.85) were markedly better than prediction results (RMSEP=0.30, r_p~2=0.49). For a low total titratable acidity (TTA) product, peach (with spectra collected across fruit maturity stages; mean±SD of 0.88±0.17%), calibration results were relatively poor (RMSECV=0.09%, r_(cv)~2=0.79) and the model failed in prediction (RMSEP=0.10%, r_p~2=0.00, bias=0.02%). It is concluded that interactance geometry shortwave (700-1100 nm) near infrared spectroscopy using diode array instrumentation and an interactance optical geometry suited to on-line or field-portable instrumentation used for Brix and DM assessment is not appropriate for assessment of the acidity of intact low TTA fruit and has limited use for high TTA fruit.
机译：完整水果的相互作用光谱（700-1100 nm）具有被解释为是由于水OH拉伸和组合带的稀释和扰动（以及OH的第二和第三泛音分别在960 nm和740 nm拉伸）而形成的特征柠檬酸CH_2和OH的拉伸及结合带的贡献不明显。使用从酸橙果实的切面收集的相互作用谱建立的模型（平均±SD为7.3±0.51 g柠檬酸当量100 mL〜（-1），单位表示为％w / v）实现了RMSEP = 0.16的预测结果％，r_p〜2 ＝ 0.79，偏差＝ -0.03％。然而，对于完整的石灰水果，模型校准结果（RMSECV = 0.16，r_（cv）〜2 = 0.85）明显优于预测结果（RMSEP = 0.30，r_p〜2 = 0.49）。对于总滴定酸度（TTA）低的产品（桃子，在果实成熟阶段收集的光谱;平均值±SD为0.88±0.17％），校准结果相对较差（RMSECV = 0.09％，r_（cv）〜2 = 0.79）。 ），模型无法预测（RMSEP = 0.10％，r_p〜2 = 0.00，偏差= 0.02％）。结论是，使用二极管阵列仪器的短波（700-1100 nm）近红外光谱的相互作用几何学和适于在线或现场便携式仪器用于白利糖度和DM评估的相互作用光学几何学不适用于评估酸度。完整的低TTA水果，对高TTA水果的使用受到限制。

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