A large consumer panel of mixed age, genders, and cultural background participated in a series of triangle tests involving the aroma of rice samples obtained from retail outlets. The group could, as a whole, distinguish between Australian fragrant (AF) and non-fragrant (NF) rice and between AF and imported fragrant (IF) rices based on aroma. The ability to discriminate between the samples varied with age, gender, and cultural background. In addition descriptions of the aromas by participants implied that the aroma of AF rice was preferable to that of both the IF and Australian NF rice. The NF rice contained approximately twice the amounts of 2-hexenal[E], nonanal, 2-pentylfuran, and 2-octenal[E], and significantly more 2-nonenal[E] and hexanal, compared to the fragrant rices. 2-Acetyl-1-pyrroline (2AP) was present in both fragrant rices but not in the NF sample. The AF rice contained twice the amount of 2-heptenal[E] and three times the amount of 2-decenal[E] and 2,4-decadienal[E,E] compared to the IF rice. The concentrations of significant aroma volatiles were linked to aroma descriptions of the rices.
Effects of polyethylene bags, ethylene absorbent and 1-methylcyclopropene on the storage of Japanese pears
AbstractStorage of the 'Nijisseiki' cultivar of Japanese pears was studied over three seasons for periods up to 36 weeks at 0°C. Storage in 50 pm thick low-density polyethylene (LDPE) bags at 0°C considerably delayed yellowing in all experiments, even after fruit was removed to 20°C for 1 week at the end of storage. The addition of an ethylene absorbent made from potassium permanganate on aluminium oxide (Purafil II) further delayed yellowing. Carbon dioxide levels in both treatments varied, but were generally in the range 2-3%. Oxygen levels remained high, generally 16-19%. In bags without Purafil, ethylene levels rose slightly during storage and were generally about 0.15 pi I 1. When Purafil was included in the bags, the ethylene level was reduced 10-fold or more. A sensory test indicated that the use of LDPE bags and ethylene absorbent resulted in fruit with better eating quality than fruit stored in air. Disorders over the 3-year investigation were low even after long-term storage. The use of polyethylene bags reduced the severity of flesh browning, and flesh spot decay was virtually absent. Tire use of bags increased the severity of core browning. Inclusion of an ethylene absorbent in bags reduced the severity of disorders, particularly core browning. Treatment of the fruit with 1 -methylcyclopropene (1-MCP), before or during storage, resulted in higher ethylene levels in the polyethylene bags. At the concentrations used, 1-MCP did not improve the storage of 'Nijisseiki' compared to the use of polyethylene bags with Purafil II. SUMMARY Storage of the 'Nijisseiki' cultivar of Japanese pears was studied over three seasons for periods up to 36 weeks at 0°C. Storage in 50 pm thick low-density polyethylene (LDPE) bags at 0°C considerably delayed yellowing in all experiments, even after fruit was removed to 20°C for 1 week at the end of storage. The addition of an ethylene absorbent made from potassium permanganate on aluminium oxide (Purafil II) further delayed yellowing. Carbon dioxide levels in both treatments varied, but were generally in the range 2-3%. Oxygen levels remained high, generally 16-19%. In bags without Purafil, ethylene levels rose slightly during storage and were generally about 0.15 pi I 1. When Purafil was included in the bags, the ethylene level was reduced 10-fold or more. A sensory test indicated that the use of LDPE bags and ethylene absorbent resulted in fruit with better eating quality than fruit stored in air. Disorders over the 3-year investigation were low even after long-term storage. The use of polyethylene bags reduced the severity of flesh browning, and flesh spot decay was virtually absent. Tire use of bags increased the severity of core browning. Inclusion of an ethylene absorbent in bags reduced the severity of disorders, particularly core browning. Treatment of the fruit with 1 -methylcyclopropene (1-MCP), before or during storage, resulted in higher ethylene levels in t...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.