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Cao L.,Shanghai JiaoTong University | Liu M.,Shanghai JiaoTong University | Zhang H.,Shanghai JiaoTong University | Qian B.,Shanghai JiaoTong University | And 4 more authors.
Philippine Agricultural Scientist | Year: 2010

The influence of different sanitizers on nutritional composition and lignification of sliced few-flower wildrice (Zizania latifolia Turcz.) was investigated. Wildrice slices washed with 100 mg L -1 chlorine dioxide (ClO 2), 50 mg L -1 hydrogen peroxide (H 2O 2) and 80 mg L -1 peroxyacetic acid (PAA) were packed in micro perforated polyethylene film for 21 d at 2°C. Microbial growth, gas composition, soluble solids content (SSC), pH, whiteness index (WI), vitamin C, phenols, firmness and lignin were determined every 7 d. Compared with water washing, three sanitizers inhibited microbial growth and browning, delayed lignification, and maintained tenderness of few-flower wildrice. ClO 2 was superior to other sanitizers in reducing microbial population and respiration activity, but caused significant SSC loss and lignification. PAA treatment retained better texture, higher vitamin C and phenol content than H 2O 2, but did not significantly affect microbial growth, WI and lignin. Our data suggested that PAA washing pretreatment has more potential to keep the quality of fresh-cut few-flower wildrice.

Liu M.,Shanghai JiaoTong University | Qian B.,Shanghai JiaoTong University | Zhang H.,Shanghai JiaoTong University | Deng Y.,Shanghai JiaoTong University | And 3 more authors.
Food Research International | Year: 2010

To investigate the effects of sanitation processing on the lignification of few-flower wildrice (FFW), fresh-cut FFW was treated with water (control), 80mg/L peroxyacetic acid (PAA), 100mg/L ClO2 or 50mg/L H2O2, packed in polyethylene film bags and stored at 2°C for 21days. Firmness, lignin, cellulose, hemicellulose and lignin forming related enzymes activities were examined. Sanitizer treatments inhibited the increases of firmness, lignin and cellulose than the control. The changes of hemicelluloses did not show a difference between the control and PAA treatment. An increase in the activities of phenylalanine ammonia lyase (PAL), peroxidase (POD) and polyphenol oxidase (PPO), and a reduction in catalase (CAT) and superoxide dismutase (SOD) activities, were detected in the sliced FFW in the incompatible interaction. Compared with the control, sanitizers suppressed the activities of PAL, POD and PPO, but enhanced the activities of SOD and CAT during 21days of storage. These enzymatic activities varied with different sanitizers. These results show that 80mg/L peroxyacetic acid (PAA), 100mg/L ClO2 or 50mg/L H2O2 sanitation processing can maintain tenderness, alleviate the lignification and fibrosis of fresh-cut FFW. © 2010 Elsevier Ltd.

Qian B.,Shanghai JiaoTong University | Luo Y.,Shanghai JiaoTong University | Deng Y.,Shanghai JiaoTong University | Cao L.,Shanghai JiaoTong University | And 3 more authors.
Journal of the Science of Food and Agriculture | Year: 2012

Background: The chemical compositions of the stem and leaf sheath of few-flower wild rice were analysed. In addition, their extracts were evaluated for diphenylpicrylhydrazyl (DPPH) free radical-scavenging activity, ferric-reducing antioxidant power and angiotensin-converting enzyme (ACE)-inhibitory activity, since these are important properties of sources of nutraceuticals or functional foods. Results: The stems contained more ascorbic acid (0.06 g kg -1 fresh weight), protein (28.18 g kg -1 dry weight (DW)), reducing sugars (308.54 g kg -1 DW), water-soluble pectin (20.63 g kg -1 DW), Na 2CO 3-soluble pectin (44.14 g kg -1 DW), K (8 g kg -1 dry matter (DM), S (6 g kg -1 DM) and P (5 g kg -1 DM) but less starch, total dietary fibre, Si, Na and Ca than the leaf sheaths. The DPPH free radical-scavenging IC 50 values of the stem and leaf sheath extracts were 19.28 and 21.22 mg mL -1 respectively. In addition, the ACE-inhibitory IC 50 value of the stem extracts was 38.54 mg mL -1. Conclusion: Both the stem and leaf sheath extracts exhibited good antioxidant properties, while good ACE-inhibitory activity was detected only in the phosphate buffer solution extracts of the stem. Few-flower wild rice could be processed into formula feeds for fish, poultry, etc. or functional foods for persons with high blood pressure. © 2011 Society of Chemical Industry.

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