Carotenoids are lipophilic and their biochemistry linked to the lipid/water interfaces including membranes. The increasing interest in the chemistry of β-carotene relates to the many functions of these biomolecules with their rich structural diversity, many of which are poorly understood, although carotenoids seem to be an integral part of the inherent defense against oxidative stress in plants and animals as quenchers of singlet oxygen and as radical scavengers. It has been demonstrated that β-carotene may be excellent electron donor, with redox reaction dynamics that may involve electron transfer (ET). Moreover, the timescales of photo-excited states and reactions in these systems are compatible with the timescales of laser excited muon spectroscopy, on the microsecond timescale. This is the first proposal in a line of many to characterise this interesting class of molecules.