Effects of Calcium Oxide on Physicochemical Properties of Spray-dried Bayberry Powder

Xianju SONG

School of Life Science,Taizhou University,Taizhou 318000,China

Effects of Calcium Oxide on Physicochemical Properties of Spray-dried Bayberry Powder

Xianju SONG*

School of Life Science,Taizhou University,Taizhou 318000,China

[Objective]Effects of different contents of calcium oxide on physicochemical properties of spray-dried bayberry powder were studied.[Method]Bayberry powder produced from bayberry juice adding 0,2 and 4 g/L calcium oxide using the spray drying technique has been selected.The physicochemical properties of the spray-dried bayberrypowderwere investigated bydetermining moisture content, colour,apparent density,wettability,angle of repose and moisture absorption rate of bayberry powder.[Result]The results showed that the content of calcium oxide had a significant effect on the moisture content and colour of bayberry powder.Effects of different contents of calcium oxide on the apparent density of spray-dried bayberry powder were not obvious.Adding calcium oxide had a significant effect on the wettability,angle of repose and moisture absorption rate of spray-dried bayberry powder,nevertheless,there was not obvious difference on these properties between adding 2 and 4 g/L calcium oxide.[Conclusion]The results confirmed that the content of calcium oxide had a significant effect on the properties of spray-dried bayberry powder.

Calcium oxide;Spray-drying;Bayberry powder;Physicochemical properties

B ayberryjuice contains high sugarwhich is mainly low molecular sugar,so it easily leads to adheringphenomenonin the spray drying process,the obtained spray-dried bayberry powder easily tends to moisture absorption and bond.To solve the cohesiveness of sugar materials in the spray drying process,some methods like raising the glass-transition temperature (GTT)[1],modifying low molecular sugar[2]and specific spray drying techniques[3]were adopted.

In this study,chemical modification method was adopted to integrate low molecular sugar with calcium ion, and improve the anti-wettability and fluidity of spray-dried bayberry powder,thereby learning about the effect law ofcalcium oxide contenton physicochemical properties of spraydried bayberry powder.

Materials and Methods

Materials

Raw materials and reagents

Dongkuibayberry,purchased from Linhai market;bayberry powder,produced from fresh bayberry juice by juicing,mixing and spray drying;calcium oxide,made in Shanghai Reagent Factory.

Key instrumentsSP-1500 lab spray dryer,Shanghai Sunyi Tech.Co.,Ltd.; HP-200 precise colorimeter,Shanghai Chinaspec Optoelectronics Technology Co.,Ltd.;FA1104 electronic balance,Shanghai Precision&Scientific InstrumentCo.,Ltd.;DS-1waring blender,Shanghai Specimen Model Factory;electric blast drying oven, ShanghaiYiheng Scientific Instruments Co.,Ltd.;biochemical incubator,Shanghai Yuejin Medical Optical Instruments Factory.

Methods

The preparation of bayberry powder

The technological parameters of spray drying were as follows:the content of soluble solid state material of bayberry juice was 14%,hot air temperature was 160℃,the flow of hot air was 15 ml/s,and filling flow was 8 ml/s.Under these conditions,spraydried bayberry powder was prepared.

The determination of moisture contentThe determination of moisture content of bayberry powder was based on the method of Huang Weikun[4]. About 3 g bayberry powder was got, then it was baked in the drying oven with (102±3)℃until constant weight. The experiment was repeated again, finally the average value of the two was taken.

The determination of colourHP-200 precise colorimeter was adopted to measure L value and a value of bayberry powder,in which L value represented whiteness,and a value represented red and green degree of the samples,the greater the value,the redder the samples[5].The measurement was repeated six times and the average value was got.

The determination of apparent density20 g bayberry powder was fallen into 100 ml measuring cylinder from the funnel,the weight and the volume of the powder were measured.The process was repeated three times,finally the apparent density(g/cm3)was calculated[6-7].

The determination of wettability

100 ml deionized water was added into 250 ml beaker,then the beaker was put into thermostatic waterbath with 25℃,after that,10 g bayberry powder was added,then the time of all bayberry powder dispersing into the water was recorded.

The determination of angle of repose200 g bayberry powder was poured on the surface plate by the fixed funnel,the angle of repose of the obtained cone-shaped body was measured[8].The angle of repose(ψ)of the samples was represented by angle and calculated according to the formula(1):

In the formula,h was vertebral shape height of powder(mm),the result was the arithmetic mean value of the five measurements.

The determination of moisture absorption rate[9]The dried weighing bottle was weighed,and the weight was recored as M1;the spray-dried bayberry powder was added into the weighing bottle,then weighing,the weight was recored as M2;after that, the bottle was put into a dryer with Na-Cl saturated salt solution.The dryer was put into constant temperature incubation with 25℃for 24 h,then the weighing bottle with bayberry powder was taken out and weighed,the weight was recored as M3.Finally,the moisture absorption rate was calculated according to the formula(2):

Results and Analyses

Effects of different contents of calcium oxide on the moisture content of bayberry powder

Effects of different contents of calcium oxide on the moisture content of bayberry powder were in Table 1. As shown in Table 1,with the increase of calcium oxide content,the moisture contentofbayberry powderdecreased,moreover,effects of different contentsofcalcium oxide on the moisture content of bayberry powder were significant,there were significant differences on the moisture content among three kinds of bayberry powder obtained by spray drying.

Effects of different contents of calcium oxide on the colour of bayberry powder

It can be seen from Table 2 that L value and a value of bayberry powder obtained from bayberry juice with three contents of calcium oxide using spray drying method decreased with the increase of calcium oxide content, showing that the colour of bayberry powder darkened with the increase of calcium oxide content,namely it changed from bright red to dark red, the red became shallower.Thus,calcium oxide content had obvious effect on L value and a value of bayberry powder,there were significant differences on L value and a value among three kinds of bayberry powder obtained by spray drying.

Effects of different contents of calcium oxide on the apparent density of bayberry powder

Effects of different contents of calcium oxide on the apparent density of bayberry powder were in Table 3. The apparent densities of bayberry powder obtained from bayberry juice adding 0,2 and 4 g/L calcium oxide using the spray drying technique were 0.623,0.631 and 0.636 g/cm3,respectively.The analysis results showed that there were not significant differences on the apparent densities among three kinds of bayberry powder,calcium oxide content had not obvious effect on the apparent density of bayberry powder.

Table 1 Effects of different contents of calcium oxide on the moisture content of bayberry powder

Table 2 Effects of different contents of calcium oxide on the colour of bayberry powder

Table 3 Effects of different contents of calcium oxide on the apparent density of bayberry powder

Effects of different contents of calcium oxide on the wettability of bayberry powder

Effects of different contents of calcium oxide on the wettability of bayberry powder were in Table 4.With the increase of calcium oxide content, the time of all bayberry powder dispersing into the water decreased;the dispersing seconds of all bayberry powder obtained from bayberry juice adding 0,2 and 4 g/L calcium oxide using the spray drying technique were 99,90 and 89 s,respectively.Thus as seen in Table 4,adding 2 g/L calcium oxide can significantly improve the wettability of bayberry powder,and the difference on the wettability of bayberry powderobtained from bayberry juice between adding 2 and 4 g/L calcium oxide was not obvious.

Effects of different contents of calcium oxide on the angle of repose of bayberry powder

Effects of different contents of calcium oxide on the angle of repose of bayberry powder were in Table 5. With the increase of calcium oxide content,the angle of repose of bayberry powder decreased;the angles of repose of bayberry powder obtained from bayberry juice adding 0,2 and 4 g/L calcium oxide using the spray drying technique were 25.0°,22.3°and 21.5°,respectively.As shown in Table 5,adding 2 g/L calcium oxide can significantly decrease the angle of repose,indicating that the mobility of bayberry powder was enhanced,and there was not significant difference on the angle of repose of bayberry powder obtained from bayberry juice between adding 2 and 4 g/L calcium oxide,thus the mobility of the two kinds of bayberry powder had not significant difference.

Effects of different contents of calcium oxide on the moisture absorption rate of bayberry powder

Effects of different contents of calcium oxide on the moisture absorption rate of bayberry powder were in Table 6.As shown in Table 6,with the increase of calcium oxide content,the moisture absorption rate of bayberry powder decreased;the moisture absorption rates of bayberry powder obtained from bayberry juice adding 0,2 and 4 g/L calcium oxide using the spray drying technique were 9.27%, 7.49%and 7.31%,respectively.From Table 6,it still can be seen that adding 2 g/L calcium oxide can significantly decrease the moisture absorption rate of bayberry powder,and there was not significant difference on the moisture absorption rate of bayberry powder obtained from bayberry juice between adding 2 and 4 g/L calcium oxide.

Table 4 Effects of different contents of calcium oxide on the wettability of bayberry powder

Table 5 Effects of different contents of calcium oxide on the angle of repose of bayberry powder

Table 6 Effects of different contents of calcium oxide on the moisture absorption rate of bayberry powder

Conclusions

Calcium oxide content had a significant effect on the moisture content and colour of bayberry powder;with the increase of calcium oxide content, the moisture content of bayberry powder decreased,and the colour of bayberry powder changed from bright red to dark red.The content of calcium oxide had not obvious effect on the apparent density of bayberry powder. With the increase of calcium oxide content,the wettability of bayberry powder improved,adding 2 g/L calcium oxide can significantly improve the wettability of bayberry powder,and the difference on the wettability of bayberry powderobtained from bayberry juice between adding 2 and 4 g/L calcium oxide was not obvious.With the increase of calcium oxide content,the angle of repose of bayberry powder decreased,adding 2 g/L calcium oxide can significantly decrease the angle of repose,and there was not significant difference on the angle of repose of bayberry powder obtained from bayberry juice between adding 2 and 4 g/L calcium oxide.With the increase of calcium oxide content,the moisture absorption rate of bayberry powder decreased,adding 2 g/L calcium oxide can significantly decrease the moisture absorption rate of bayberry powder, and there was not significant difference on the moisture absorption rate of bayberry powder obtained from bayberry juice between adding 2 and 4 g/L calcium oxide.

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Responsible editor:Nanling WANG

Responsible proofreader:Xiaoyan WU

氧化鈣對噴霧干燥楊梅粉理化性質(zhì)的影響

宋賢聚*
（臺州學(xué)院生命科學(xué)學(xué)院，浙江臺州318000）

[目的]研究不同氧化鈣含量對噴霧干燥楊梅粉理化性質(zhì)的影響。[方法]將添加氧化鈣含量為0、2、4 g/L的楊梅汁噴霧干燥得到楊梅粉，通過測定楊梅粉的水分含量、色澤、表觀密度、濕潤性、休止角和吸濕性研究三種楊梅粉的理化性質(zhì)。[結(jié)果]氧化鈣的添加量顯著地影響楊梅粉的水分含量和色澤；氧化鈣含量對楊梅粉表觀密度的影響不顯著；添加氧化鈣可以顯著影響楊梅粉的濕潤性、休止角和吸濕性，而添加2和4 g/L氧化鈣的楊梅汁所制得的楊梅粉之間沒有顯著差異。[結(jié)論]添加氧化鈣影響噴霧干燥楊梅粉的產(chǎn)品品質(zhì)。

氧化鈣；噴霧干燥；楊梅粉；理化性質(zhì)

浙江省自然科學(xué)基金資助項目（Y3110376）。

宋賢聚（1973-），男，浙江蘭溪人，講師，從事農(nóng)產(chǎn)品加工方面的研究，E-mail：Songxj_jj@163.com。*通訊作者。

2015-04-20

修回日期 2015-07-16

Supported by the Project of Natural Science Fund of Zhejiang Province(Y3110376).

*Corresponding author.E-mail:Songxj_jj@163.com

Received:April 20,2015 Accepted:July 16,2015