Analyte Extracting solvent Matrix Ref
Proline Hot water Rice [13]
  3% sulfosalicylic acid Aspen (Populustremula L.) [53]
  3%sulfosalicylic acid Tomato plants [15]
  3%sulfosalicylic acid Maize plants [17]
  3%sulfosalicylic acid Sugarbeet [14]
  3%sulfosalicylic acid Green gram [16]
  5% sulfosalicylic acid Altriplexhalimus L. [18]
  8% sulfosalicylic acid Xerophytes and mesophytes [19]
  10% sulfosalicylic acid Wheat plants [20]
  70%methanol Tomato pollen [21]
  95% ethanol Tomato plants [22]
  MCW (65:25:15) Melaleucaspecies [23]
  2% sulfosalicylic acid Rice leaves [26]
  3% sulfosalicylic acid Tomato plants [25]
  3% sulfosalicylic acid Mulberry leaves [27]
  3% sulfosalicylic acid Sugarbeet [24]
  3% sulfosalicylic acid Tomato leaves [28]
  MCW (15:5:1 v/v/v) Sugarcane callus culture [31]
Betaine 80% ethanol Enterococcus feacalis [34]
  Water Higher plants [35]
  Water Altriplexhalimus L [18]
  Methanol Zea mays [38]
  Methanol Thai jasmine rice [37]
  Methanol:anhydrous acetonitrile (1:9) Green gram [16]
  MCW (70:20:10, v/v/v) Barely plants [42]
  MCW (12:5:1, v/v/v) Suaedamaritima shoots [39]
  MCW (10:5:6, v/v/v) Zea mays L [45]
  MCW (12:5:1, v/v) Limonium species and other halophytes [46]
  MCW (12:5:1, v/v) Cereals and other grasses [41]
  MCW (12:5:1, v/v) Tobacco plants [44]
  MCW (12:5:1, v/v) Barley leaves [40]
  Ethanol Rape leaf [33]
  Water Spinach leaves [58]
Mannitol Hot water Ligustrumlucidum Ait [52]
  80% ethanol Phaselous vulgaris leaves [54]
  80% ethanol Celery [55]
Sugars MCW (12:5:3) Ligneous plants [49]
Sugars 80% ethanol Muskmelon Fruit [142]
Sugars and sugar alcohols 80% ethanol Corn Kernels [48]
Sugars and sugar alcohols 80% ethanol Celery Petioles [55]
Sugars and sugar alcohols 80% ethanol Aspen (Populustremula L.) [53]
Proline, betaine 70% ethanol Bacterial strains [59]
Proline, betaine MCN (60:25:15, v/v/v) Oak leaves [32]
Proline, betaine Ethanol: water (80:20) Spinach leaves [58]
Proline, betaine, mannitol MCW (65:25:15, v/v/v) Peanut and cotton [61]
Table 1: Extracting solvents reported for the extraction of proline, mannitol and betaine.