msd R+Y values indicate the 95% confidence
interval for the respective Lovibond Red and Yellow scales.a Time (weeks) represents 8 h of exposure per
day for 7 weeks. b Control represents all TOs
stored away from sunlight for seven consecutive days.c Test represents TOs exposed to sunlight for
seven consecutive weeks.
Table 5: Summary of dominant functional groups in the TOs studied
according to FTIR spectroscopy and computation modelling (Poianaet al. , 2015)(Vlachos et al. , 2006)(Alshuiael and
Al-Ghouti, 2020).