Data on the composition of Israeli orange juice, grapefruit juice, orange peel and grapefruit peel were analyzed. Significant differences were found mainly between the juice and peel in the content of isocitric acid, ash, minerals, total pectin, total flavonoids, chlorides, phosphates, chloramine‐T number and arginine. The significance of these findings in detecting juice adulteration with peel extract solids is discussed. The chemical and amino acids characteristics of the citrus products analyzed may be used to establish guidelines required for detecting citrus juice adulteration.
Artocarpus heterophyllus (jack fruit), Manilkara zapota (sapota), Mangifera indica (mango), Vitis vinifera (grapes), Citrus sinensis (orange) and Syzygium cumini (jambul) seeds were selected to evaluate the in vitro invertase inhibitory activity. M. zapota (shake flask method: 98.7%) and A. heterophyllus (shake flask method: 35.6%) seeds recorded the highest and lowest in vitro invertase inhibitory activity, respectively. The two-dimensional thin-layer chromatography and twodimensional preparative thin-layer chromatography (2D PTLC) analyses have demonstrated the presence of polyphenols in M. zapota and A. heterophyllus seeds. The 2D PTLC eluate of M. zapota has recorded a significant invertase inhibitory activity. Liquid chromatography-mass spectrometry photo diode array analysis of M. zapota has exhibited the presence of four different polyphenols such as benzoyl hexosyl methyl luteolin sulfate (m/z 662.1), 6C/8C hexosyl, 6C/8C pentosyl apigenin (m/z 568), one unknown carboxylated flavonol glycoside (m/z 484.7) and one unknown flavone derivative (m/z 473.8).
PRACTICAL APPLICATIONSThe fruits of Manilkara zapota and Artocarpus heterophyllus have been consumed for their sweet delicious nature by most Asian community. Ethnobotanically, many parts of the above said species have been taken orally to treat various ailments. In the current scenario, appropriate food formulation as a health mix may be tried along with the seeds of M. zapota and/or A. heterophyllus to have a balanced glycemic control in the biological system.
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