5 research outputs found

    Study of Factors Influencing China-ASEAN Agricultural Product Trade Development in the Context of “the Belt and Road”

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    This paper reviewed and analyzed the current situations and influencing factors of the bilateral agricultural product trade development in China-ASEAN Free Trade Area (CAFTA), which has important practical significance for promoting the in-depth development of the free trade area and has guiding significance for precise policy implementation. Based on the status of import and export trade of agricultural products in CAFTA from 2013 to 2017, it constructed a trade gravity model. With the aid of STATA14.0 software, it explored major factors influencing the development of bilateral agricultural trade from the total amount of agricultural products import and export and Commodity Indexes for the Standard International Trade Classification, Revision 3 (SITC Rev.3) agricultural product classification data. The empirical regression results show that the GDP of ASEAN countries, the ratio of agricultural added value to GDP, and the per capita gross national income (GNI) measured based on the purchasing power parity (PPP) exchange rate have the greatest impact on agricultural product trade in CAFTA in the context of “the Belt and Road” (B&D). Based on empirical research, it came up with recommendations including adjusting the import and export structure of agricultural products, enhancing product competitive advantages, and implementing diversified markets

    Effect of Sodium Selenite-Chitosan Compound Preservative on Storability of Kumquats

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    [Objectives] To explore the effect of sodium selenite-chitosan compound preservative on storability of kumquats. [Methods] Under the condition of room temperature, fresh kumquats were coated with different concentrations of sodium selenite-chitosan compound preservative, respectively. [Results] Sodium selenite-chitosan compound preservative reduced the weight loss rate, delayed the decline of vitamin C, soluble solids, titratable acid and GSH contents, slowed down the accumulation of MDA, inhibited the increase of PPO activity, and increased to a certain extent the activity of SOD in fresh kumquats. [Conclusions] Sodium selenite-chitosan compound preservative maintained the quality and prolonged the shelf life of kumquats. The preservation effect of compound preservative composed of 4 mg/L sodium selenite and 8 g/L chitosan was the best

    Application of Prochloraz-nano-titanium Dioxide Complex Fresh-keeping Agent in Refrigeration of Dioscorea alata Lirm. sp.

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    Prochloraz diluents (450×, 475×, 500×) were added with different concentrations of nano-titanium dioxide (TiO2) (0.8%, 1.0%) respectively to prepare complex fresh-keeping agents, which were applied in the refrigeration of Dioscorea alata Lirm. sp. With rot index, weight loss rate, browning degree (BD), total soluble solids (TSS) content, malondialdehyde (MDA) content, polyphenol oxidase (PPO) activity and peroxidase (POD) activity, DPPH• scavenging rate as evaluation indexes, the preservation effect of the prepared fresh-keeping agents on D. alata during the cold storage period was analyzed. The results showed that prochloraz added with nano-titanium dioxide significantly prolonged the storage life, reduced the rot rate and weight loss rate, and slowed the loss of pulp of D. alata. The preservation effect of complex fresh-keeping agent of prochloraz diluent (475×) and nano-titanium dioxide (1.0%) was better than that of other treatments

    A New Nb<sub>28</sub> Cluster Based on Tungstophosphate, [{Nb<sub>4</sub>O<sub>6</sub>(OH)<sub>4</sub>}{Nb<sub>6</sub>P<sub>2</sub>W<sub>12</sub>O<sub>61</sub>}<sub>4</sub>]<sup>36–</sup>

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    A structurally intriguing polyanion, [{Nb<sub>4</sub>O<sub>6</sub>(OH)<sub>4</sub>}­{Nb<sub>6</sub>P<sub>2</sub>W<sub>12</sub>O<sub>61</sub>}<sub>4</sub>]<sup>36–</sup> (<b>2</b>), was directly formed by controlling the reaction parameters and characterized by single-crystal X-ray diffraction, IR spectroscopy, and elemental analyses. Polyanion <b>2</b> is the first niobium-substituted Wells–Dawson-based tetramer and contains the largest Nb<sub>28</sub> cluster encapsulated by four hexalacunary Wells–Dawson frameworks. The activities of compounds Na<sub>12</sub>[H<sub>24</sub>-<b>2</b>]·24H<sub>2</sub>O (<b>2a</b>), K<sub>12</sub>[H<sub>2</sub>P<sub>2</sub>W<sub>12</sub>O<sub>48</sub>]·24H<sub>2</sub>O, and K<sub>7</sub>[HNb<sub>6</sub>O<sub>19</sub>]·13H<sub>2</sub>O against three human tumor cell lines were investigated in vitro. The preliminary results revealed that <b>2a</b> could efficiently inhibit the growth of the human breast cancer MCF-7 cells. Interestingly, the activity of <b>2a</b> is significantly better than those of the simple reagents

    水酶法提取红瓜子仁油工艺条件优化及其挥发性成分分析Optimization of aqueous enzymatic extraction of red melon seed kernel oil and its volatile components analysis

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    为了获得红瓜子仁水酶法提油的最佳工艺条件,了解红瓜子仁油贮藏过程中挥发性成分的变化,以红瓜子仁油提取率为指标,采用单因素试验和正交试验对红瓜子仁油的水酶法提取工艺条件进行优化,并采用HS-GC-IMS技术对贮藏0 d和1年(4 ℃冰箱中存放)的红瓜子仁油的挥发性成分进行分析。结果表明:水酶法提取红瓜子仁油最佳工艺条件为料液比1∶ 5、碱性蛋白酶添加量5%、酶解温度50 ℃、酶解时间3 h、pH 10,在此条件下红瓜子仁油提取率为75.68%;红瓜子仁油中主要的挥发性成分有25种,不同贮藏时间下红瓜子仁油中挥发性成分的含量存在差异,其中3-甲基-1-丁醇和3-羟基-2-丁酮可初步确定为新鲜红瓜子仁油挥发性成分的标志物。研究结果说明水酶法提取红瓜子仁油可以获得较高的油脂提取率,贮藏时间影响红瓜子仁油中挥发性成分的组成及含量。 In order to obtain the optimal process conditions of extracting oil from red melon seeds with aqueous enzymatic method and understand the changes of volatile components of the red melon seed kernel oil during storage, with the extraction rate as the index, the extraction process conditions of red melon seed kernel oil were optimized by single factor experiment and orthogonal experiment, and the volatile components of red melon seed kernel oil stored for 0 d and 1 year (stored in a refrigerator at 4 ℃) were analyzed by HS-GC-IMS. The results showed that the optimal process conditions for aqueous enzymatic extraction of red melon seed kernel oil were obtained as follows: solid-liquid ratio 1∶ 5, enzyme dosage of alkali protease 5%, enzymatic hydrolysis temperature 50 ℃, enzymatic hydrolysis time 3 h, and pH 10. Under the optimal conditions, the extraction rate of red melon seed kernel oil was 75.68%. There were 25 main volatile components in the red melon seed kernel oil, and there were differences in the content of volatile components in red melon seed kernel oil under different storage time, among which 3-methyl-1-butanol and 3-hydroxyl-2-butanone could be preliminarily identified as a marker of volatile components in fresh red melon seed kernel oil. In conclusion, the aqueous enzymatic extraction of red melon seed kernel oil can obtain higher oil extraction rate, and the storage time affects the composition and content of volatile components in red melon seed kernel oil