TSS was determined as °Brix using aWAY-2S digital Abbe Refraction
meter (Shanghai Precision and Scientific Instrument Co., Ltd, Shanghai,
China) at ambient temperature (20 ± 1 °C). pH value determination
was carried out by an Orion 868 pH meter (Thermo Orion, USA) with
a combined pH electrode at 20 ± 1 °C.