Fruit Juices

Optimisation of analytical methods for the characterisation of oranges, clementines and citrus hybrids cultivated in Spain on the basis of their composition in ascorbic acid, citric acid and major sugars

“…However, these sugars could not be quantified according to this method as they were the sum of free glucose or fructose plus the generated from the sucrose hydrolysis caused by the mobile phase. Citrus exhibit a higher content in citric acid than in other organic acids (Kelebek & Selli, ) it accounts for about 90% of the total organic acids content in orange juice (Huang et al ., ). Great variability was found among the samples when citric and succinic acid contents were considered (Table S3).…”

Evaluation of Physicochemical Properties of South African Cashew Apple Juice as a Biofuel Feedstock

“…Additionally, maltose content was determined and the concentration was 2.18 gL −1 . The detection of maltose for CAJ has not been previously reported but the presence of maltose is not unusual, as maltose is a sugar component of fruit juices [ 39 ].…”

Mid-Infrared Spectroscopy Coupled with Chemometrics: A Tool for the Analysis of Intact Food Systems and the Exploration of Their Molecular Structure−Quality Relationships − A Review

“…Water is a significant absorber in the MIR spectral region and can interfere with the determination of other components present in food systems . Major bands are present at 3920, 3490, 3280, and 1645 cm −1 , although the exact location and shape of these bands may be affected by the presence of solutes, , hydrogen-bonding, and temperature. , The triglyceride ester linkage C−O at ∼1175 cm −1 , the CO group (∼1750 cm −1 ), and the acyl chain C−H (3000−2800 cm −1 ) frequencies are commonly used to determine fat, − while the amide I (∼1653 cm −1 ) and II bands (∼1567 cm −1 ) have been used for the estimation of protein , and changes in protein secondary structure. − Vibrations arising from C−O and C−H stretch in the region between 1100 and 1000 cm −1 may be used to identify aqueous sugar molecules, , while more complex carbohydrate structures found in plants have major absorption bands at higher wavenumbers, for example, hemicellulose (1732, 1240 cm −1 ), cellulose (1170−1150, 1050, 1030 cm −1 ), lignan (1590, 1510 cm −1 ), and pectin (1680−1600, 1260, 955 cm −1 ). , …”

“…For further information on band assignment in the MIR region, the reader may refer to other texts. ,,,− For a fuller review of the fundamentals of MIR spectroscopy, the reader is referred to other publications. ,− Descriptions of MIR instrumentation are beyond the scope of this Review; the interested reader is directed to other sources. ,, …”