Highchart Drilldown point name in double quotation

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ASP.NET

jQuery

C#3.5

HighCharts

events: {
        drilldown: function (e) {
         if (!e.seriesOptions) {
var Fruitsname= e.point.name;
//var Fruitsname='Fruits';
   drilldowns = {
Fruitname:{
//  'Fruits': {


              name: 'Fruits',
              data: [
              ['Apples', 5],
              ['Oranges', 7],
              ['Bananas', 2]
                ]
              },
           }
        }
      }
  }

I got click event on drill down using e.point.name, but string name under drill down is taking as in double quotation but it required string in single quote .
I tried using alert and console.log but it is showing without quotes,In breakpoints it showing in double quotes.I have commented line 'Fruits' it works as static value.

Any suggestion or help will be appreciated
thanks in advance..